Disclosure of Invention
An object of the present invention is to provide a compound that can be used in an organic electroluminescent device, particularly a Hole Injection Layer (HIL) material or a Hole Transport Layer (HTL) material, and that can provide a device with high luminous efficiency and low driving voltage.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention provides a compound, which has a structure shown in a formula I;
in the formula I, Ar is1The substituent of the arylene group of C6-C60 is selected from C1-C30 aliphatic alkyl or C1-C30 aliphatic alkoxy;
in the formula I, Ar is2、Ar3And Ar4Each independently selected from the group shown in formula II or substituted or unsubstituted C6-C60 aryl, wherein the substituent of the C6-C60 aryl is selected from C1-C30 aliphatic alkylOr C1-C30 aliphatic alkoxy;
in formula II, the wavy line represents the linkage of the group;
in the formula II, W is selected from C6-C60 arylene;
in the formula II, Ar is5And Ar6Each independently selected from C6-C60 aryl;
in the formula I, X, Y and Z are respectively and independently selected from any one of substituted or unsubstituted C1-C30 aliphatic alkyl, substituted or unsubstituted C3-C30 cycloalkyl and substituted or unsubstituted C1-C30 aliphatic alkoxy, and the substituent of the C1-C30 aliphatic alkyl, the C3-C30 cycloalkyl or the C1-C30 aliphatic alkoxy is selected from C6-C60 aryl;
in the formula I, n is 0 or 1;
any hydrogen atom in formula I is replaced or not replaced by deuterium.
On existing OLED analogous compounds, Ar1The invention provides a compound shown in formula I, wherein N atoms at two ends are substituted by aromatic compounds, belonging to triarylamine compounds1One substituent on the N atoms at two ends is changed into X and Y (or X, Y and Z) shown in the invention from an aromatic compound, so that the HOMO and LOMO energy levels of the material are improved, and the material provided by the invention is used as a Hole Injection Layer (HIL) material or a Hole Transport Layer (HTL) material and has higher luminous efficiency and lower driving voltage when being applied to an OLED (organic light emitting diode) device. And the structure is changed, and simultaneously, the dissolving performance of the material in an organic solvent, the film forming performance of the residual organic material after the solvent of the material solution is volatilized, and the viscosity property of the material in the organic solvent are correspondingly changed, so that the material is more suitable for being prepared by using a solution method when being used for preparing an OLED device.
In the present invention, "substituted or unsubstituted" means that the group may or may not be substituted with a substituent, for example, a substituted or unsubstituted C1-C30 aliphatic alkyl group, and means that the C1-C30 aliphatic alkyl group may or may not be substituted with a substituent. The selection range of the substituents is as described above, and the number of the substituents is not limited in the present invention as long as it is within the maximum substitutable number, and when two or more substituents are simultaneously substituted on the same group, the two or more substituents may be the same or different. The invention relates to the same expression mode and has the same meaning.
In the present invention, the number of carbon atoms in the arylene group having from C6 to C60 may be C8, C10, C12, C14, C16, C18, C20, C22, C24, C26, C28, C30, C32, C34, C36, C38, C40, C42, C44, C46, C48, C50, C52, C54, C56, C58, or the like; the number of carbon atoms of the aryl group of C6 to C60 may be C8, C10, C12, C14, C16, C18, C20, C22, C24, C26, C28, C30, C32, C34, C36, C38, C40, C42, C44, C46, C48, C50, C52, C54, C56, C58, or the like; the number of carbon atoms of the C1 to C30 aliphatic alkyl group may be C2, C3, C4, C5, C6, C7, C8, C9, C10, C11, C12, C13, C14, C15, C16, C17, C18, C19, C20, C21, C22, C23, C24, C25, C26, C27, C28, C29, or the like; the number of carbon atoms of the C1 to C30 aliphatic alkoxy group may be C2, C3, C4, C5, C6, C7, C8, C9, C10, C11, C12, C13, C14, C15, C16, C17, C18, C19, C20, C21, C22, C23, C24, C25, C26, C27, C28, C29, or the like; the number of carbon atoms of the C3 to C30 cycloalkyl group may be C3, C4, C5, C6, C7, C8, C9, C10, C11, C12, C13, C14, C15, C16, C17, C18, C19, C20, C21, C22, C23, C24, C25, C26, C27, C28, C29, or the like.
Preferably, the compound has the structure shown in formula III;
in the formula III, the X, Y, Ar1、Ar2And Ar3Each independently has the same meaning as in formula I.
Preferably, Ar is1Selected from benzeneAny one of a phenyl group, a naphthyl group, an anthryl group, a phenanthryl group, a 9, 9-dialkyl substituted fluorenyl group, a spirofluorenyl group, a carbazolyl group, a dibenzothienyl group, a dibenzofuranyl group, an indolocarbazolyl group, an indenocarbazolyl group, a biphenyl group, a binaphthyl group, a bianthryl group, a binaphthyl group, a terphenyl group, a triphenylene group, a fluoranthyl group, a benzophenanthryl group, or a hydrogenated benzanthracenyl group.
Preferably, Ar is2、Ar3And Ar4Each independently selected from the group shown in the formula II, or at least two of phenyl, naphthyl, anthryl, phenanthryl, 9-diphenyl substituted fluorenyl, 9-dialkyl substituted fluorenyl, biphenyl, binaphthyl, bianthryl, terphenyl, triphenylene, fluoranthenyl, benzophenanthryl or hydrogenated benzoanthryl.
Preferably, when n is 1, Ar is2、Ar3And Ar4At least one (e.g., one, two, three, or four, etc.) of the groups is selected from the group of formula II; when n is 0, Ar is2And Ar3At least one (e.g., one, two, three, or four, etc.) of which is selected from the group of formula II.
According to the invention, at least one arylamine group shown in the formula II is preferably selected, so that the compound at least contains three arylamine structures, the structure enables the conjugation of molecules to be enlarged, the Eg between the corresponding HOMO and LUMO to be reduced, and simultaneously the HOMO is improved, so that the energy level difference between the material serving as a hole injection material and ITO is reduced, and the hole injection is facilitated, therefore, the luminous efficiency of the device can be further improved, and the driving voltage is reduced.
Preferably, in formula III, Ar is2And Ar3At least one of them is selected from the group represented by formula II.
Preferably, W is selected from any one of phenylene, biphenylene, naphthylene, 9-diphenyl substituted fluorenylene or 9, 9-dialkyl substituted fluorenylene, spirobifluorenylene and terphenylene.
Preferably, Ar is5And Ar6Each independently selected from phenyl, naphthyl, anthryl, phenanthryl, 9-diAny one of phenyl-substituted fluorenyl, 9-dialkyl-substituted fluorenyl, biphenyl, binaphthyl, dianthranyl, binaphthyl, terphenyl, triphenylene, fluoranthryl, benzophenanthryl, or hydrogenated benzanthryl.
Preferably, X, Y and Z are each independently selected from a group of formula IV or a C3-C30 cycloalkyl group;
in the formula IV, L1Selected from C1-C10 (e.g. C2, C3, C4, C5, C6, C7, C8, C9, etc.) aliphatic alkyl, L2Selected from C1-C6 (e.g., C2, C3, C4, C5, C6) aliphatic alkyl groups;
in the formula IV, m is an integer of 0-6, such as 1, 2, 3, 4, 5 and the like;
in formula IV, the wavy line represents the bond of the group, i.e. formula IV in L1Is attached to the N atom in formula I.
Preferably, the compound has any one of the structures shown as P-1 to P-182 below:
ar in the compound shown as the formula I2、Ar3、Ar4When n is equal to 1, the synthesis pathway is represented as follows:
wherein Ar is1、Ar3X and Y are as defined in the description above, and Z represents chlorine, bromine, iodine.
V and M-2 are subjected to carbon-nitrogen coupling reaction to generate the compound shown in the formula I.
It is a second object of the present invention to provide an intermediate useful in the preparation of the compound of the first object, said intermediate having the structure:
in the formula V, the X, Y, Z and Ar1All toolsHave the same meaning as in formula I.
The invention also aims to provide application of the compound, which is applied to an organic electroluminescent device.
Preferably, the compound is used as a hole transport layer material or a hole injection layer material of an organic electroluminescent device.
It is a fourth object of the present invention to provide an organic electroluminescent device comprising an anode layer, a cathode layer and an organic layer interposed between the anode layer and the cathode layer, wherein the organic layer contains a compound according to one of the objects.
Preferably, the organic layer includes a hole injection layer containing the compound according to one of the objects.
Preferably, the organic layer includes a hole transport layer containing the compound according to one of the objects.
The fifth object of the present invention is to provide a display panel including the organic electroluminescent device of the fourth object.
It is a sixth object of the present invention to provide a display device including the organic electroluminescent device according to the fourth object or the display panel according to the fifth object.
Compared with the prior art, the invention has the following beneficial effects:
the compound provided by the invention can be applied to an organic electroluminescent device, particularly as a Hole Injection Layer (HIL) material or a Hole Transport Layer (HTL) material, can enable the device to have higher luminous efficiency and lower driving voltage, and is more suitable for being prepared by a solution method when being used for preparing an OLED device.
Detailed Description
The technical solution of the present invention is further explained by the following embodiments. It should be understood by those skilled in the art that the examples are only for the understanding of the present invention and should not be construed as the specific limitations of the present invention.
The following synthesis examples exemplarily provide methods for synthesizing specific compounds, but the present invention is not limited to the following specific synthesis methods, and a person skilled in the art can select a synthesis method according to the prior art.
Synthesis example 1 Synthesis of P-1
(1) Synthesis of N, N ' -diethyl-1, 1' -biphenyl-4, 4' -diamine
Adding 12.1 g (0.1mol) of N-ethylaniline, 300 ml of toluene and 27 g (0.1mol) of ferric chloride hexahydrate into a 500 ml three-neck flask, stirring and heating to 80 ℃ for reacting for 4 hours, cooling, adding water for separating liquid, washing an organic layer to be neutral, separating by silica gel column chromatography, adding petroleum ether: ethyl acetate ═ 9: 1 to obtain 8.6g of N, N ' -diethyl-1, 1' -biphenyl-4, 4' -diamine with the yield of 71.67 percent.
The obtained product N, N ' -diethyl-1, 1' -biphenyl-4, 4' -diamine is subjected to mass spectrometric detection, and the molecular m/z is determined as follows: 240.
the obtained product N, N ' -diethyl-1, 1' -biphenyl-4, 4' -diamine was subjected to nuclear magnetic detection, and the data were analyzed as follows:
1HNMR(500MHz,CDCl3):δ7.50(m,4H),δ6.53(m,4H),δ3.62(s,2H),δ3.45(m,4H),δ1.29(t,6H)。
(2) synthesis of P-1
A500 ml three-necked flask was charged with nitrogen, and 80 ml of dry toluene, 2.4 g (0.01mol) of N, N ' -diethyl-1, 1' -biphenyl-4, 4' -diamine, 3.45 g (0.022mol) of bromobenzene, 0.0575 g (0.0001mol) of Pd (dba)2(bis-dibenzylideneacetone palladium), 0.4 g (0.0002mol) of a toluene solution containing 10% tri-tert-butylphosphine, 2.3 g (0.024mol) of sodium tert-butoxide, heated to reflux for 4 hours, cooled, and then added with water to separate the liquidConcentrating the organic layer to be dry, separating by silica gel column chromatography, and mixing petroleum ether: ethyl acetate ═ 9: 1 (volume ratio) to obtain 3.6 g of a compound represented by P-1, with a yield of 91.8%.
Performing mass spectrum detection on the compound shown as the P-1, and determining that the molecular m/z is as follows: 392.
the nuclear magnetic detection is carried out on the compound shown as P-1, and the data are analyzed as follows:
1HNMR(500MHz,CDCl3):δ7.55(m,4H),δ7.45~7.38(m,6H),δ7.35(m,6H),δ7.08(m,2H),δ3.59~3.47(m,4H),δ1.15(t,6H)。
synthesis example 2 Synthesis of P-5
The synthesis method is the same as that of P-1 in example 1, except that bromobenzene in the reaction mixture is replaced by 2-bromo-9, 9-diphenylfluorene in equal amount to obtain a compound P-5.
Performing mass spectrum detection on the compound shown in the P-5, and determining that the molecular m/z is as follows: 872.
the nuclear magnetic detection is carried out on the compound shown as P-5, and the data are analyzed as follows:
1HNMR(500MHz,CDCl3):δ8.00(m,2H),δ7.92(m,2H),δ7.87(d,2H),δ7.65(d,2H),δ7.55(m,4H),δ7.41~7.32(m,6H),δ7.29~7.14(m,16H),δ7.11(m,8H),δ3.62~3.46(m,4H),δ1.15(t,6H)。
synthesis example 3 Synthesis of P-15
The synthesis method is the same as that of P-1 in example 1, except that bromobenzene therein is replaced by the same amount of substance
To obtain the compound P-15.
Performing mass spectrum detection on the compound shown as the P-15, and determining that the molecular m/z is as follows: 896.
the nuclear magnetic detection is carried out on the compound shown as P-15, and the data are analyzed as follows:
1HNMR(500MHz,CDCl3):δ8.20(m,8H),δ7.66(m,4H),δ7.55(m,12H),δ7.46~7.34(m,18H),δ3.36~3.22(m,4H),δ1.15(t,6H)。
synthesis example 4 Synthesis of P-19
The synthesis method was the same as that of P-1 in example 1, except that bromobenzene was replaced by 4-bromotriphenylamine in an equivalent amount to obtain compound P-19.
Performing mass spectrum detection on the compound shown as P-19, and determining that the molecular m/z is as follows: 726.
the nuclear magnetic detection is carried out on the compound shown as P-19, and the data are analyzed as follows:
1HNMR(500MHz,CDCl3):δ7.57(m,4H),δ7.38(m,4H),δ7.26(m,8H),δ7.15(s,8H),δ7.06(m,8H),δ7.00(m,4H),δ3.63~3.48(m,4H),δ1.15(t,6H)。
synthesis example 5 Synthesis of P-23
The synthesis method is the same as that of P-1 in example 1, except that bromobenzene therein is replaced by the same amount of substance
Compound P-23 is obtained.
Performing mass spectrum detection on the compound shown as the P-23, and determining that the m/z of the molecule is as follows: 958.
the nuclear magnetic detection is carried out on the compound shown as P-23, and the data are analyzed as follows:
1HNMR(500MHz,CDCl3):δ7.88(d,4H),δ7.56(m,4H),δ7.49(m,4H),δ7.38(m,4H),δ7.28~7.16(m,12H),δ7.11(m,8H),δ7.02(m,4H),δ3.61~3.52(m,4H),δ1.70(s,12H),δ1.15(t,6H)。
synthesis example 6 Synthesis of P-34
The synthesis method comprises the following steps:
(1) 3.52 g (0.01mol) of 2, 7-dibromo-9, 9-dimethylfluorene, 4.5 g (0.1mol) of ethylamine, 20 ml of toluene, 50 ml of N, N-dimethylformamide, 0.1 g of cuprous iodide, 5.52 g (0.04mol) of potassium carbonate are added into a 250 ml autoclave, after nitrogen replacement, the autoclave is sealed and heated to 100 ℃ for reaction for 8 hours, the temperature is reduced, water is added for liquid separation, an organic layer is washed to be neutral, the organic layer is concentrated to be dry, silica gel column chromatography separation is carried out, and petroleum ether: ethyl acetate ═ 9: 1 to obtain 1.61 g of N2, N7-diethyl-9, 9-dimethyl-9H-fluorene-2, 7-diamine with the yield of 57%.
Mass spectrum detection is carried out on the obtained product N2, N7-diethyl-9, 9-dimethyl-9H-fluorene-2, 7-diamine, and the molecular m/z is determined as follows: 280.
the obtained product N2, N7-diethyl-9, 9-dimethyl-9H-fluorene-2, 7-diamine was subjected to nuclear magnetic resonance examination, and the data were analyzed as follows:
1HNMR(500MHz,CDCl3):δ7.77(d,2H),δ6.91(d,2H),δ6.66(m,2H),δ3.66(s,2H),δ3.45(m,4H),δ1.71(s,6H),δ1.28(t,6H)。
(2) a250 ml three-necked flask was charged with 100 ml of dry toluene under nitrogen protection, 2.8 g (0.01mol) of N2 represented by the formula P-34-2, N7-diethyl-9, 9-dimethyl-9H-fluorene-2, 7-diamine, 3.45 g (0.022mol) of bromobenzene, 0.0575 g (0.0001mol) of Pd (dba)2(bis-dibenzylideneacetone palladium), 0.4 g (0.0002mol) of a toluene solution containing 10% tri-tert-butylphosphine, 2.3 g (0.024mol) of sodium tert-butoxide, reflux reaction for 8 hours under heating, cooling, adding water to separate the liquid, washing the organic layer with water to neutrality, separating by silica gel column chromatography, petroleum ether: ethyl acetate ═ 9: 1 (volume ratio) to obtain 3.5 g of a compound represented by P-34 with a yield of 81%.
Performing mass spectrum detection on the compound shown as the P-34, and determining that the m/z of the molecule is as follows: 432.
the nuclear magnetic detection is carried out on the compound shown as P-34, and the data are analyzed as follows:
1HNMR(500MHz,CDCl3):δ7.88(d,2H),δ7.40(m,6H),δ7.35(m,4H),δ7.15(m,2H),δ7.09(m,2H),δ3.60~3.47(m,4H),δ1.70(s,6H),δ1.15(t,6H)。
synthesis example 7 Synthesis of P-52
The procedure was as described for the synthesis of P-34 in example 6 except that bromobenzene was replaced by 4-bromo-triphenylamine in an equivalent amount to obtain compound P-52.
Performing mass spectrum detection on the compound shown as P-52, and determining that the m/z of the molecule is as follows: 766.
the nuclear magnetic detection is carried out on the compound shown as P-52, and the data are analyzed as follows:
1HNMR(500MHz,CDCl3):δ7.80(d,2H),δ7.33(d,2H),δ7.15(m,8H),δ7.06(m,10H),δ7.03(m,8H),δ6.95(m,4H),δ3.60~3.44(m,4H),δ1.68(s,6H),δ1.14(t,6H)。
synthesis example 8 Synthesis of P-55
Synthesis method for P-34 in synthetic example 6, except that bromobenzene therein is replaced by equivalent amount of substance
To obtain the compound P-55.
Performing mass spectrum detection on the compound shown as P-55, and determining that the molecular m/z is as follows: 918.
the nuclear magnetic detection is carried out on the compound shown as P-55, and the data are analyzed as follows:
1HNMR(500MHz,CDCl3):δ7.88(d,2H),δ7.55(m,8H),δ7.45(d,2H),δ7.39(m,8H),δ7.26(m,8H),δ7.17(d,2H),δ7.11(m,8H),δ7.02(m,4H),δ3.64~3.53(m,4H),δ1.70(s,6H),δ1.14(t,6H)。
synthesis example 9 Synthesis of P-67
(1) Synthesis of N2, N7-dibenzyl-9, 9-dimethyl-9H-fluorene-2, 7-diamine
Synthesis method with reference to the synthesis of N2, N7-diethyl-9, 9-dimethyl-9H-fluorene-2, 7-diamine in example 6, the ethylamine was replaced with an equivalent amount of benzylamine to obtain N2, N7-dibenzyl-9, 9-dimethyl-9H-fluorene-2, 7-diamine.
Mass spectrum detection is carried out on the obtained product N2, N7-dibenzyl-9, 9-dimethyl-9H-fluorene-2, 7-diamine, and the molecular m/z is determined as follows: 404.
nuclear magnetic detection was performed on the obtained product N2, N7-dibenzyl-9, 9-dimethyl-9H-fluorene-2, 7-diamine, and the data were analyzed as follows:
1HNMR(500MHz,CDCl3):δ7.83(d,2H),δ7.34~7.29(m,10H),δ6.97(d,2H),δ6.70(m,2H),δ4.33(s,4H),δ3.95(s,2H),δ1.71(s,6H)。
(2) synthesis of P-67
Synthesis method with reference to the synthesis method of P-34 in example 6, except that N2, N7-diethyl-9, 9-dimethyl-9H-fluorene-2, 7-diamine was replaced with an equivalent amount of N2, N7-dibenzyl-9, 9-dimethyl-9H-fluorene-2, 7-diamine, and bromobenzene was replaced with an equivalent amount of N2, N7-dibenzyl-9, 9-dimethyl-9H-fluorene-2, 7-diamine
To obtain the compound shown as the formula P-67.
Performing mass spectrum detection on the compound shown as P-67, and determining that the m/z of the molecule is as follows: 1082.
the nuclear magnetic detection is carried out on the compound shown as P-67, and the data are analyzed as follows:
1HNMR(500MHz,CDCl3):δ7.79(d,4H),δ7.72(d,2H),δ7.52(d,2H),δ7.50~7.43(m,6H),δ7.39(m,2H),δ7.33(m,4H),δ7.26~7.14(m,18H),δ7.03(m,8H),δ6.95(m,4H),δ4.35(s,2H),δ4.21(s,2H),,δ1.71(s,12H)。
synthesis example Synthesis of P-82
(1) Synthesis of N1, N4-diethylbenzene-1, 4-diamine
Synthesis method referring to the synthesis of N2, N7-diethyl-9, 9-dimethyl-9H-fluorene-2, 7-diamine in example 6, except that 2, 7-dibromo-9, 9-dimethylfluorene therein was replaced with an equivalent amount of p-dibromobenzene to obtain N1, N4-diethylbenzene-1, 4-diamine.
The obtained product N1, N4-diethylbenzene-1, 4-diamine is subjected to mass spectrum detection, and the molecular m/z is determined as follows: 164.
the obtained product N1, N4-diethylbenzene-1, 4-diamine was subjected to nuclear magnetic resonance analysis, and the data were analyzed as follows:
1HNMR(500MHz,CDCl3):δ6.59(s,4H),δ3.47(m,4H),δ2.83(s,2H),δ1.29(t,6H)。
(2) synthesis of P-82
Synthesis method with reference to the synthesis method of P-34 in example 6, except that N2, N7-diethyl-9, 9-dimethyl-9H-fluorene-2, 7-diamine was replaced with an equivalent amount of N1, N4-diethylbenzene-1, 4-diamine, and bromobenzene was replaced with an equivalent amount of bromobenzene
To obtain the compound shown as the formula P-82.
Performing mass spectrum detection on the compound shown as the P-82, and determining that the molecular m/z is as follows: 1034.
the nuclear magnetic detection is carried out on the compound shown as P-82, and the data are analyzed as follows:
1HNMR(500MHz,CDCl3):δ8.11(m,2H),δ7.91(m,2H),δ7.87(d,2H),δ7.54~7.49(m,4H),δ7.45~7.36(m,10H),δ7.35~7.29(m,4H),δ7.25(m,2H),δ7.17~7.11(m,14H),δ7.09(m,4H),δ3.39(m,2H),δ3.33(m,2H),δ1.70(s,12H),δ1.15(t,6H)。
synthesis example 11 Synthesis of P-91
(1) Synthesis of N1, N3, N5-triethylbenzene-1, 3, 5-triamine
3.15 g (0.01mol) of 1,3, 5-tribromobenzene, 5.4 g (0.2mol) of ethylamine, 20 ml of toluene, 50 ml of N, N-dimethylformamide, 0.1 g of cuprous iodide, 8.28 g (0.06mol) of potassium carbonate are added into a 250 ml autoclave, after nitrogen replacement, the autoclave is sealed and heated to 100 ℃ for reaction for 8 hours, the temperature is reduced, water is added for liquid separation, an organic layer is washed to be neutral, the organic layer is concentrated to be dry, silica gel column chromatography separation is carried out, and petroleum ether: ethyl acetate ═ 9: 1 to obtain 1.11 g of product N1, N3, N5-triethyl benzene-1, 3, 5-triamine with 53.6 percent of yield.
The obtained products N1, N3, N5-triethyl benzene-1, 3,5 triamine are subjected to mass spectrum detection, and the molecular m/z is determined as follows: 207.
the obtained products N1, N3, N5-triethyl benzene-1, 3, 5-triamine were subjected to nuclear magnetic detection, and the data were analyzed as follows:
1HNMR(500MHz,CDCl3):δ5.26(s,3H),δ3.47(m,6H),δ3.35(s,3H),δ1.29(t,9H)。
(2) synthesis of the Compound represented by P-91:
a250 ml three-necked flask was charged with 100 ml of dry toluene under nitrogen protection, 2.07 g (0.01mol) of N1, N3, N5-triethylbenzene-1, 3, 5-triamine, 12.96 g (0.04mol) of 4-bromo-N, N-diphenylaniline, 0.115 g (0.0002mol) of Pd (dba)2(bis (dibenzylideneacetone palladium)), 0.8 g (0.0004mol) of a toluene solution containing 10% tri-tert-butylphosphine, 3.46 g (0.036mol) of sodium tert-butoxide, reflux-heating for 8 hours, cooling, adding water for separating liquid, washing the organic layer with water to neutrality, separating by silica gel column chromatography, petroleum ether: ethyl acetate: dichloromethane ═ 9: 0.5: elution with 0.5 (by volume) gave 5.6 g of the compound P-91 in 59.8% yield.
Performing mass spectrum detection on the compound shown as P-91, and determining that the m/z of the molecule is as follows: 936.
the nuclear magnetic detection is carried out on the compound shown as P-91, and the data analysis is as follows:
1HNMR(500MHz,CDCl3):δ7.26(m,12H),δ7.13(s,12H),δ7.09(m,12H),δ7.02(m,6H),δ6.51(s,3H),δ3.59(m,3H),δ3.53(m,3H),δ1.15(t,9H)。
synthesis example 12 Synthesis of P-107
Synthesis method reference was made to the synthesis of P-55 in Synthesis example 8 except that in (1) the ethylamine was changed to N-butylamine therein to give N2, N7-di-N-butyl-9, 9-dimethyl-9H-fluorene-2, 7-diamine.
Mass spectrum detection is carried out on the obtained product N2, N7-di-N-butyl-9, 9-dimethyl-9H-fluorene-2, 7-diamine, and the molecular m/z is determined to be: 336.
nuclear magnetic detection was performed on the obtained product N2, N7-di-N-butyl-9, 9-dimethyl-9H-fluorene-2, 7-diamine, and the data were analyzed as follows:
1HNMR(500MHz,CDCl3):δ7.79(d,2H),δ6.91(d,2H),δ6.66(m,2H),δ3.70(s,2H),δ3.31(m,4H),δ1.71(s,6H),δ1.49(m,4H),δ1.31(m,4H),δ0.90(t,6H)。
in the step (2), the procedure of the step (2) of Synthesis example 8 was repeated except that N2, N7-diethyl-9, 9-dimethyl-9H-fluorene-2, 7-diamine was changed to N2, N7-di-N-butyl-9, 9-dimethyl-9H-fluorene-2, 7-diamine
Change to
The compound shown as P-107 is obtained.
Performing mass spectrum detection on the compound shown as P-107, and determining that the m/z of the molecule is as follows: 1126.
the nuclear magnetic detection is carried out on the compound shown as P-107, and the data are analyzed as follows:
1HNMR(500MHz,CDCl3):δ7.88(d,2H),δ7.77(m,8H),δ7.56(m,8H),δ7.51(m,8H),δ7.43(m,4H),δ7.38(m,8H),δ7.17(s,8H),δ6.53(d,2H),δ6.15(m,2H),δ3.95(t,4H),δ1.70(s,6H),δ1.49(m,4H),δ1.32(m,4H),δ0.91(t,6H)。
synthesis example 13 Synthesis of P-150
(1) Synthesis of N4, N4' -diethyl-N4-phenyl- [1,1' -biphenyl ] -4,4' -diamine
A500 ml three-necked flask was charged with nitrogen, and 80 ml of dry toluene, 2.4 g (0.01mol) of N, N ' -diethyl-1, 1' -biphenyl-4, 4' -diamine, 1.57 g (0.01mol) of bromobenzene, 0.0575 g (0.0001mol) of Pd (dba)2(palladium bis (dibenzylideneacetone)), 0.4 g (0.0002mol) of a toluene solution containing 10% tri-tert-butylphosphine, 1.44 g (0.015mol) of sodium tert-butoxide, heated to 60 ℃ to react for 4 hours, cooled, added with water to separate the liquid, the organic layer concentrated to dryness, separated by silica gel column chromatography, petroleum ether: ethyl acetate 15: 1 (volume ratio) to obtain N4, N4 '-diethyl-N4-phenyl- [1,1' -biphenyl]1.22 g of (E) -4,4' -diamine, yield 38.6%.
Mass spectrometry detection is carried out on N4, N4' -diethyl-N4-phenyl- [1,1' -biphenyl ] -4,4' -diamine, and the molecular m/z is determined as follows: 316.
nuclear magnetic resonance analysis was performed on N4, N4' -diethyl-N4-phenyl- [1,1' -biphenyl ] -4,4' -diamine, and the data was resolved as follows:
1HNMR(500MHz,CDCl3):δ7.57(m,2H),δ7.51(m,2H),δ7.44~7.30(m,6H),δ7.07(m,1H),δ6.52(m,2H),δ3.60~3.49(m,3H),δ3.47(m,2H),δ1.29(t,3H),δ1.15(t,3H)。
(2) synthesis of P-150
500 ml three-mouth bottle, nitrogen gasTo this solution, 200 ml of dry toluene and 3.16 g (0.01mol) of N4, N4 '-diethyl-N4-phenyl- [1,1' -biphenyl were added]4,4 '-diamine, 5.52 g (0.01mol) N, N-bis ([1,1' -biphenyl)]-4-yl) -4 '-bromo- [1,1' -biphenyl]-4-amine, 0.0575 g (0.0001mol) Pd (dba)2(palladium bis (dibenzylideneacetone)), 0.4 g (0.0002mol) of a toluene solution containing 10% tri-tert-butylphosphine, 1.44 g (0.015mol) of sodium tert-butoxide, heated to reflux for 8 hours, cooled, added with water to separate the liquid, the organic layer concentrated to dryness, separated by silica gel column chromatography, petroleum ether: ethyl acetate ═ 9: 1 (volume ratio) to obtain 5.92 g of a compound represented by P-150 with a yield of 75.1%.
Performing mass spectrum detection on the compound shown as P-150, and determining that the m/z of the molecule is as follows: 787.
the nuclear magnetic detection is carried out on the compound shown as P-150, and the data are analyzed as follows:
1HNMR(500MHz,CDCl3):δ7.73(m,4H),δ7.53(m,12H),δ7.47(m,5H),δ7.40~7.29(m,17H),δ7.03(m,1H),δ3.61~3.47(m,4H),δ1.15(t,6H)。
synthesis example 14 Synthesis of P-160
(1) Synthesis of N1- ([1,1' -biphenyl ] -4-yl) -N1, N4-diethylbenzene-1, 4-diamine
Synthesis method referring to the synthesis of N4, N4' -diethyl-N4-phenyl- [1,1' -biphenyl ] -4,4' -diamine in example 13, except that N, N ' -diethyl-1, 1' -biphenyl-4, 4' -diamine therein was changed to N1, N4-diethylbenzene-1, 4-diamine and bromobenzene therein was changed to 4-bromobiphenyl to obtain N1- ([1,1' -biphenyl ] -4-yl) -N1, N4-diethylbenzene-1, 4-diamine.
Mass spectrometry detection is carried out on N1- ([1,1' -biphenyl ] -4-yl) -N1, N4-diethylbenzene-1, 4-diamine, and the molecular m/z is determined as follows: 316.
nuclear magnetic resonance analysis was performed on N1- ([1,1' -biphenyl ] -4-yl) -N1, N4-diethylbenzene-1, 4-diamine, and the data were analyzed as follows:
1HNMR(500MHz,CDCl3):δ7.77(m,2H),δ7.57(m,2H),δ7.51(m,2H),δ7.41(m,1H),δ7.36(m,2H),δ7.08(m,2H),δ6.95(m,2H),δ3.59~3.41(m,4H),δ3.21(s,1H),δ1.29(t,3H),δ1.15(t,3H)。
(2) synthesis of P-160
Synthesis method referring to the synthesis of P-150 in example 13, except that N4, N4' -diethyl-N4-phenyl- [1,1' -biphenyl ] -4,4' -diamine was changed to N1- ([1,1' -biphenyl ] -4-yl) -N1, N4-diethylbenzene-1, 4-diamine, and N, N-bis ([1,1' -biphenyl ] -4-yl) -4' -bromo- [1,1' -biphenyl ] -4-amine was changed to N- ([1,1' -biphenyl ] -3-yl) -N- (4' -bromo- [1,1' -biphenyl ] -4-yl) - [1,1' -biphenyl ] -3-amine, the compound shown as P-160 is obtained.
Performing mass spectrum detection on the compound shown as P-160, and determining that the molecular m/z is as follows: 787.
the nuclear magnetic detection is carried out on the compound shown as P-160, and the data are analyzed as follows:
1HNMR(500MHz,CDCl3):δ7.77(m,6H),δ7.59~7.39(m,17H),δ7.36(m,6H),δ7.29(t,2H),δ7.18(m,4H),δ7.16(s,4H),δ3.60~3.48(m,4H),δ1.15(t,6H)。
synthesis example 15 Synthesis of P-170
(1) Synthesis of N4, N4 '-bis (4-bromophenyl) -N4, N4' -diethyl- [1,1 '-biphenyl ] -4,4' -diamine
A250 ml three-necked flask was charged with 100 ml of dry toluene, 2.4 g (0.01mol) of N, N ' -diethyl-1, 1' -biphenyl-4, 4' -diamine, 18.9 g (0.08mol) of p-dibromobenzene, 0.115 g (0.0002mol) of Pd (dba)2(bis-dibenzylideneacetone palladium), 0.8 g (0.0004mol) of a toluene solution containing 10% tri-tert-butylphosphine, 3.84 g (0.04mol) of sodium tert-butoxide, heated to 60 ℃ and reacted for 4 hoursCooling, adding water to separate liquid, washing organic layer to neutrality, silica gel column chromatographic separation, petroleum ether elution to obtain N4, N4' -bis (4-bromophenyl) -N4, N4' -diethyl- [1,1' -biphenyl]1.9 g of (E) -4,4' -diamine, yield 34.5%.
p-N4, N4' -bis (4-bromophenyl) -N4, N4' -diethyl- [1,1' -biphenyl]Mass spectrometric detection of the 4,4' -diamine, determining the molecular m/z as: 550, determining the molecular formula as C28H26Br2N2。
(2) Synthesis of P-170-1
A 500 ml three-neck flask, protected by nitrogen, 200 ml of dry toluene, 5.5 g (0.01mol) of N4, N4' -bis (4-bromophenyl) -N4, N4' -diethyl- [1,1' -biphenyl]4,4' -diamine, 6.77 g (0.04mol) 4-phenylaniline, 0.115 g (0.0002mol) Pd (dba)2(bis (dibenzylideneacetone palladium)), 0.8 g (0.0004mol) of a toluene solution containing 10% tri-tert-butylphosphine and 3.84 g (0.04mol) of sodium tert-butoxide, heating to 60 ℃ to react for 6 hours, cooling, adding water to separate the liquid, washing the organic layer to neutrality, separating by silica gel column chromatography, eluting with petroleum ether to obtain 1.1 g of a compound represented by P-170-1, wherein the yield is 15.13%.
Performing mass spectrum detection on the compound shown as P-170-1, and determining that the molecular m/z is as follows: 726.
the nuclear magnetic detection is carried out on the compound shown as P-170-1, and the data are analyzed as follows:
1HNMR(500MHz,CDCl3):δ7.75(m,4H),δ7.59~7.41(m,14H),δ7.38(m,8H),δ7.15(s,8H),δ5.65(s,2H),δ3.59~3.50(m,4H),δ1.15(t,6H)。
(3) synthesis of P-170
500 ml three-neck flask, nitrogen protection, 200 ml dry toluene, 7.27 g (0.01mol) P-170-1Compound, 5.39 g (0.022mol) of P-170-2, 0.0575 g (0.0001mol) of Pd (dba)2(palladium bis (dibenzylideneacetone)), 0.4 g (0.0002mol) of a toluene solution containing 10% tri-tert-butylphosphine, 2.3 g (0.024mol) of sodium tert-butoxide, heated to reflux for 8 hours, cooled, separated by water, the organic layer concentrated to dryness, separated by silica gel column chromatography, petroleum ether: ethyl acetate ═ 9: 1 (volume ratio) to obtain 6.7 g of the compound P-170, the yield is 63.5%.
Performing mass spectrum detection on the compound shown as P-170, and determining that the molecular m/z is as follows: 1054.
the nuclear magnetic detection is carried out on the compound shown as P-170, and the data are analyzed as follows:
1HNMR(500MHz,CDCl3):δ7.73(m,4H),δ7.55~7.38(m,14H),δ7.33(m,8H),δ7.29(m,4H),δ7.18(m,4H),δ7.10(s,8H),δ4.65(s,4H),δ3.62~3.49(m,12H),δ3.40(s,6H),δ1.15(t,6H)。
synthesis example 16 Synthesis of P-176
(1) Synthesis of N4, N4' -bis (2-methoxyethoxy) ethyl) - [1,1' -biphenyl ] -4,4' -diamine
Adding 19.5 g (0.1mol) of N- (2- (2-methoxyethoxy) ethyl) aniline, 300 ml of toluene and 25 g (0.1mol) of copper sulfate pentahydrate into a 500 ml three-neck flask, stirring and heating to 80 ℃, reacting for 48 hours, cooling, adding water for separating liquid, washing an organic layer to be neutral, separating by silica gel column chromatography, adding petroleum ether: ethyl acetate ═ 8: 2 to obtain 5.8g of N4, N4' -bis (2- (2 methoxyethoxy) ethyl) - [1,1' -biphenyl ] -4,4' -diamine with the yield of 29.9 percent.
The obtained product N4, N4' -bis (2- (2 methoxyethoxy) ethyl) - [1,1' -biphenyl ] -4,4' -diamine is subjected to mass spectrum detection, and the molecular m/z is determined as follows: 388.
the obtained product N4, N4' -bis (2- (2 methoxyethoxy) ethyl) - [1,1' -biphenyl ] -4,4' -diamine was subjected to nuclear magnetic resonance analysis, and the data were analyzed as follows:
1HNMR(500MHz,CDCl3):δ7.50(m,4H),δ6.52(m,4H),δ3.80(s,2H),δ3.66(m,4H),δ3.57~3.50(m,8H),δ3.48~3.43(m,4H),δ3.41(s,6H)。
(2) synthesis of P-176
A 500 ml three-neck flask, protected by nitrogen, 150 ml of dry toluene, 3.9 g (0.01mol) of N4, N4 '-bis (2-methoxyethoxy) ethyl) - [1,1' -biphenyl]-4,4' -diamine, 9.7 g (0.022mol) of P-176-1, 0.0575 g (0.0001mol) of Pd (dba)2(palladium bis (dibenzylideneacetone)), 0.4 g (0.0002mol) of a toluene solution containing 10% tri-tert-butylphosphine, 2.3 g (0.024mol) of sodium tert-butoxide, heated to reflux for 12 hours, cooled, separated by water, concentrated to dryness in the organic layer, separated by silica gel column chromatography, petroleum ether: ethyl acetate ═ 9: 1 (volume ratio) to obtain 6.8 g of the compound P-176 with the yield of 61.4%.
Performing mass spectrum detection on the compound shown as P-176, and determining that the m/z of the molecule is as follows: 1106.
the nuclear magnetic detection is carried out on the compound shown as P-176, and the data are analyzed as follows:
1HNMR(500MHz,CDCl3):δ7.88(m,2H),δ7.85(d,2H),δ7.56~7.46(m,8H),δ7.37~7.28(m,6H),δ7.25~7.17(m,8H),δ7.12(s,8H),δ7.07(m,4H),δ6.98(m,2H),δ3.65(m,4H),δ3.55~3.49(m,8H),δ3.48~3.41(m,4H),δ3.39(s,6H),δ1.69(s,12H)。
synthesis example 17 Synthesis of P-180
(1) Synthesis of P-180-1
5.53 g (0.01mol) of 2,2', 7-tribromo-9, 9' -spirobifluorene, 4.5 g (0.1mol) of ethylamine, 30 ml of toluene, 60 ml of N, N-dimethylformamide, 0.1 g of cuprous iodide and 5.52 g (0.04mol) of potassium carbonate are added into a 250 ml autoclave, the mixture is subjected to nitrogen replacement, then the mixture is heated in a sealed manner to 100 ℃ for reaction for 8 hours, cooled, added with water for liquid separation, an organic layer is washed to be neutral and concentrated to be dry, and subjected to silica gel column chromatography separation, petroleum ether: ethyl acetate ═ 9: 1, 3.1 g of a product shown by P-180-1 is obtained by elution, and the yield is 69.6 percent.
Performing mass spectrum detection on the obtained product shown in the formula P-180-1, and determining that the molecular m/z is as follows: 445.
the obtained product shown in P-180-1 is subjected to nuclear magnetic detection, and the data analysis is as follows:
1HNMR(500MHz,CDCl3):δ7.87(m,1H),δ7.82~7.77(m,3H),δ7.47(m,1H),δ7.28~7.21(m,2H),δ6.90(d,2H),δ6.87(d,1H),δ6.72~6.64(m,3H),δ3.56(s,3H),δ3.45(m,6H),δ1.28(t,9H)。
(2) synthesis of P-180
A 500 ml three-neck flask, protected by nitrogen, 200 ml of dry toluene, 4.46 g (0.01mol) of the compound represented by P-180-1, 12.96 g (0.04mol) of 4-bromo-N, N-diphenylaniline represented by P-180-2, 0.115 g (0.0002mol) of Pd (dba)2(bis (dibenzylideneacetone palladium)), 0.8 g (0.0004mol) of a toluene solution containing 10% tri-tert-butylphosphine, 3.46 g (0.036mol) of sodium tert-butoxide, reflux-heating for 8 hours, cooling, adding water for separating liquid, washing the organic layer with water to neutrality, separating by silica gel column chromatography, petroleum ether: ethyl acetate: dichloromethane ═ 9: 0.5: elution at 0.5 (vol.%) gave 9.2 g of the compound P-180 in 78.3% yield.
Performing mass spectrum detection on the compound shown as P-180, and determining that the m/z of the molecule is as follows: 1174.
the nuclear magnetic detection is carried out on the compound shown as P-180, and the data are analyzed as follows:
1HNMR(500MHz,CDCl3):δ8.13(d,1H),δ7.95~7.82(m,5H),δ7.67(m,1H),δ7.29~7.20(m,14H),δ7.15(s,12H),δ7.09(m,12H),δ7.02(m,6H),δ6.66(d,2H),δ6.21(m,2H),δ3.43(m,3H),δ3.34(m,3H),δ1.15(t,9H)。
the following examples and comparative examples provide organic electroluminescent devices using materials having the following specific structures:
examples 1-1 to 1-18, comparative examples 1-1 and 1-2
The above numbered examples used the compound of the present invention as a hole transport material in an organic electroluminescent device, and comparative examples 1-1 and 1-2 used NPB and HT-2, respectively, as a hole transport material in an organic electroluminescent device, as detailed in table 1.
The organic electroluminescent device has the following structure: ITO/HIL02(100 nm)/hole transport material (40nm)/EM1(30nm)/TPBI (30nm)/LiF (0.5nm)/Al (150 nm).
The preparation process of the organic electroluminescent device is as follows:
carrying out ultrasonic treatment on the glass substrate coated with the ITO transparent conductive layer (serving as an anode) in a cleaning agent, then washing the glass substrate in deionized water, ultrasonically removing oil in a mixed solvent of acetone and ethanol, baking the glass substrate in a clean environment until the water is completely removed, cleaning the glass substrate by using ultraviolet light and ozone, and bombarding the surface by using low-energy cation beams to improve the surface property and improve the binding capacity with a hole injection layer;
placing the glass substrate in a vacuum chamber, and vacuumizing to 1 × 10-5~9×10-3Pa, performing vacuum evaporation on the anode to form HIL02 as a hole injection layer, wherein the evaporation rate is 0.1nm/s, and the evaporation film thickness is 100 nm;
vacuum evaporating the compound or the contrast material of the invention on the hole injection layer to be used as a hole transmission layer, wherein the evaporation rate is 0.1nm/s, and the evaporation film thickness is 40 nm;
vacuum evaporating EM1 on the hole transport layer to serve as an organic light emitting layer of the device, wherein the evaporation rate is 0.1nm/s, and the total film thickness is 30 nm;
vacuum evaporating TPBI on the organic light-emitting layer to be used as an electron transport layer of the organic electroluminescent device; the evaporation rate is 0.1nm/s, and the total film thickness of the evaporation is 30 nm;
LiF with the thickness of 0.5nm and Al with the thickness of 150nm are evaporated on the electron transport layer in vacuum to be used as an electron injection layer and a cathode.
Performance testing
The luminance, driving voltage, and current efficiency of the organic electroluminescent devices prepared in the above examples and comparative examples were tested using the Hangzhou remote-produced OLED-1000 multichannel accelerated aging life and photochromic performance analysis system, and the test results are shown in Table 1.
TABLE 1
|
Hole transport material
|
Required luminance cd/m2 |
Drive voltage V
|
Current efficiency cd/A
|
Comparative examples 1 to 1
|
NPB
|
1000
|
6.15
|
1.63
|
Comparative examples 1 to 2
|
HT-2
|
1000
|
5.22
|
1.73
|
Examples 1 to 1
|
P-18
|
1000
|
4.69
|
1.68
|
Examples 1 to 2
|
P-11
|
1000
|
4.94
|
1.83
|
Examples 1 to 3
|
P-14
|
1000
|
5.08
|
1.71
|
Examples 1 to 4
|
P-32
|
1000
|
4.26
|
1.88
|
Examples 1 to 5
|
P-38
|
1000
|
5.13
|
1.84
|
Examples 1 to 6
|
P-47
|
1000
|
4.5
|
1.71
|
Examples 1 to 7
|
P-98
|
1000
|
4.71
|
1.79
|
Examples 1 to 8
|
P-107
|
1000
|
5.13
|
1.77
|
Examples 1 to 9
|
P-113
|
1000
|
4.66
|
1.73
|
Examples 1 to 10
|
P-122
|
1000
|
5.17
|
1.66
|
Examples 1 to 11
|
P-131
|
1000
|
4.74
|
1.88
|
Examples 1 to 12
|
P-140
|
1000
|
4.51
|
1.73
|
Examples 1 to 13
|
P-145
|
1000
|
4.71
|
1.89
|
Examples 1 to 14
|
P-149
|
1000
|
4.50
|
1.78
|
Examples 1 to 15
|
P-158
|
1000
|
4.32
|
2.05
|
Examples 1 to 16
|
P-161
|
1000
|
4.49
|
1.82
|
Examples 1 to 17
|
P-162
|
1000
|
4.45
|
1.76
|
Examples 1 to 18
|
P-170
|
1000
|
4.36
|
1.89 |
As can be seen from the above table, compared with conventional NPB and HT-2, the compound provided by the invention as a hole transport material of an organic electroluminescent device can improve the comprehensive performance of the device in terms of luminous efficiency and driving voltage.
Examples 2-1 to 2-17, comparative example 2-1
The compound of the invention is used as a hole injection material in an organic electroluminescent device in the numbered examples, and HIL02 is used as a hole injection material in an organic electroluminescent device in the comparative examples 2-1, which are detailed in Table 2.
The organic electroluminescent device has the following structure: ITO/hole injection material (100nm)/NPB (40nm)/EM1(30nm)/TPBI (30nm)/LiF (0.5nm)/Al (150 nm).
The preparation process of the organic electroluminescent device is as follows:
carrying out ultrasonic treatment on the glass substrate coated with the ITO transparent conductive layer (serving as an anode) in a cleaning agent, then washing the glass substrate in deionized water, ultrasonically removing oil in a mixed solvent of acetone and ethanol, baking the glass substrate in a clean environment until the water is completely removed, cleaning the glass substrate by using ultraviolet light and ozone, and bombarding the surface by using low-energy cation beams to improve the surface property and improve the binding capacity with a hole injection layer;
placing the glass substrate in a vacuum chamber, and vacuumizing to 1 × 10-5~9×10-3Pa, evaporating a contrast material HIL02 or the compound of the invention as a hole injection layer on the anode at the evaporation rate of 0.1nm/s and the evaporation film thickness of 100 nm;
carrying out vacuum evaporation on NPB (N-propyl bromide) on the hole injection layer to form a hole transport layer, wherein the evaporation rate is 0.1nm/s, and the evaporation film thickness is 40 nm;
vacuum evaporating EM1 on the hole transport layer to serve as an organic light emitting layer of the device, wherein the evaporation rate is 0.1nm/s, and the total film thickness is 30 nm;
vacuum evaporating TPBI on the organic light-emitting layer to be used as an electron transport layer of the organic electroluminescent device; the evaporation rate is 0.1nm/s, and the total film thickness of the evaporation is 30 nm;
LiF with the thickness of 0.5nm and Al with the thickness of 150nm are evaporated on the electron transport layer in vacuum to be used as an electron injection layer and a cathode.
Performance testing
The luminance, driving voltage, and current efficiency of the organic electroluminescent devices prepared in the above examples and comparative examples were tested using the Hangzhou remote-produced OLED-1000 multichannel accelerated aging life and photochromic performance analysis system, and the test results are shown in Table 2.
TABLE 2
|
Hole injection material
|
Required luminance cd/m2 |
Drive voltage V
|
Current efficiency cd/A
|
Comparative example 2-1
|
HIL02
|
1000
|
6.13
|
1.64
|
Example 2-1
|
P-3
|
1000
|
5.49
|
1.71
|
Examples 2 to 3
|
P-29
|
1000
|
4.65
|
1.8
|
Examples 2 to 4
|
P-59
|
1000
|
4.96
|
1.7
|
Examples 2 to 5
|
P-76
|
1000
|
4.85
|
1.66
|
Examples 2 to 6
|
P-78
|
1000
|
5.21
|
1.76
|
Examples 2 to 7
|
P-85
|
1000
|
5.13
|
1.78
|
Examples 2 to 8
|
P-91
|
1000
|
4.58
|
1.82
|
Examples 2 to 9
|
P-107
|
1000
|
5.09
|
1.76
|
Examples 2 to 10
|
P-115
|
1000
|
4.83
|
1.83
|
Examples 2 to 11
|
P-121
|
1000
|
4.89
|
1.66
|
Examples 2 to 12
|
P-129
|
1000
|
5.14
|
1.89
|
Examples 2 to 13
|
P-148
|
1000
|
4.84
|
1.65
|
Examples 2 to 14
|
P-152
|
1000
|
4.72
|
1.72
|
Examples 2 to 15
|
P-158
|
1000
|
6.06
|
1.72
|
Examples 2 to 16
|
P-176
|
1000
|
5.76
|
1.88
|
Examples 2 to 17
|
P-180
|
1000
|
5.41
|
1.97 |
As can be seen from the above table, compared to the conventional HIL02, the compound provided by the present invention as a hole injection material of an organic electroluminescent device can improve the light emitting efficiency and reduce the driving voltage.
Examples 3-1 to 3-6, comparative examples 3-1 and 3-2
The above numbered examples used the compound of the present invention as a hole transport material in an organic electroluminescent device, comparative examples 3-1 and 3-2 used NPB and HT-2, respectively, as a hole transport material in an organic electroluminescent device, and the hole transport layers in the above examples and comparative examples were prepared by a solution method.
The organic electroluminescent device has the following structure: ITO/HIL02(100 nm)/hole transport material/EM 1(30nm)/TPBI (30nm)/LiF (0.5nm)/Al (150 nm).
The preparation process of the organic electroluminescent device is as follows:
carrying out ultrasonic treatment on the glass substrate coated with the ITO transparent conductive layer (serving as an anode) in a cleaning agent, then washing the glass substrate in deionized water, ultrasonically removing oil in a mixed solvent of acetone and ethanol, baking the glass substrate in a clean environment until the water is completely removed, cleaning the glass substrate by using ultraviolet light and ozone, and bombarding the surface by using low-energy cation beams to improve the surface property and improve the binding capacity with a hole injection layer;
placing the glass substrate in a vacuum chamber, and vacuumizing to 1 × 10-5~9×10-3Pa, performing vacuum evaporation on the anode to form HIL02 as a hole injection layer, wherein the evaporation rate is 0.1nm/s, and the evaporation film thickness is 100 nm;
the glass substrate on which the hole injection layer had been deposited was transferred to a glove box filled with nitrogen, 0.02% (by weight) of a chlorobenzene solution of the compound of the present invention or the comparative compound was spin-coated on the hole injection layer at a spin-coating speed of 1000 rpm for 60 seconds, and then the glass substrate was heated at 80 ℃ for 2 hours, the solvent was removed in vacuo, and the film thickness of the hole transport layer on the spin-coating layer was measured by a step profiler (model amibiios XP-2surface profiler) and is shown in table 3.
Transferring the glass substrate which is spin-coated with the hole transport layer into a vacuum chamber, and performing vacuum evaporation on the hole transport layer to obtain an EM1 (effective organic light emitting layer) serving as an organic light emitting layer of the device, wherein the evaporation rate is 0.1nm/s, and the total evaporation film thickness is 30 nm;
vacuum evaporating TPBI on the organic light-emitting layer to be used as an electron transport layer of the organic electroluminescent device; the evaporation rate is 0.1nm/s, and the total film thickness of the evaporation is 30 nm;
LiF with the thickness of 0.5nm and Al with the thickness of 150nm are evaporated on the electron transport layer in vacuum to be used as an electron injection layer and a cathode.
Performance testing
The luminance, driving voltage, and current efficiency of the organic electroluminescent devices prepared in the above examples and comparative examples were tested using the Hangzhou remote-produced OLED-1000 multichannel accelerated aging life and photochromic performance analysis system, and the test results are shown in Table 3.
TABLE 3
As can be seen from the above table, when the hole transport layer is prepared by a solution method, compared to the conventional NPB and HT-2, the compound provided by the present invention as a hole transport material of an organic electroluminescent device can improve the light emitting efficiency and reduce the driving voltage.
Examples 4-1 to 4-8, comparative example 4-1
The above-numbered examples used the compound of the present invention as a hole injection material in an organic electroluminescent device, comparative examples 4-1 used HIL02 as a hole injection material in an organic electroluminescent device, and the hole injection layers were prepared using a solution method in the above-mentioned examples and comparative examples.
The organic electroluminescent device has the following structure: ITO/hole injection material/NPB (40nm)/EM1(30nm)/TPBI (30nm)/LiF (0.5nm)/Al (150 nm).
The preparation process of the organic electroluminescent device is as follows:
carrying out ultrasonic treatment on the glass substrate coated with the ITO transparent conductive layer (serving as an anode) in a cleaning agent, then washing the glass substrate in deionized water, ultrasonically removing oil in a mixed solvent of acetone and ethanol, baking the glass substrate in a clean environment until the water is completely removed, cleaning the glass substrate by using ultraviolet light and ozone, and bombarding the surface by using low-energy cation beams to improve the surface property and improve the binding capacity with a hole injection layer;
the glass substrate was transferred to a glove box filled with nitrogen, 0.05% (by weight) of a chlorobenzene solution of the compound of the present invention or the comparative compound was spin-coated on the hole injection layer at a spin-coating speed of 1000 rpm for 60 seconds, and then the glass substrate was heated at 80 ℃ for 2 hours, the solvent was removed in vacuo, and the film thickness of the hole injection layer on the spin-coating was measured by a step profiler (model amibiios XP-2surface profiler) and is shown in table 4.
Placing the above glass substrate spin-coated with the hole injection layer in a vacuum chamber, and vacuumizing to 1 × 10-5~9×10-3Pa, performing vacuum evaporation on the NPB on the hole injection layer to form a hole transport layer, wherein the evaporation rate is 0.1nm/s, and the evaporation film thickness is 40 nm;
vacuum evaporating EM1 on the hole transport layer to serve as an organic light emitting layer of the device, wherein the evaporation rate is 0.1nm/s, and the total film thickness is 30 nm;
vacuum evaporating TPBI on the organic light-emitting layer to be used as an electron transport layer of the organic electroluminescent device; the evaporation rate is 0.1nm/s, and the total film thickness of the evaporation is 30 nm;
LiF with the thickness of 0.5nm and Al with the thickness of 150nm are evaporated on the electron transport layer in vacuum to be used as an electron injection layer and a cathode.
Performance testing
The luminance, driving voltage, and current efficiency of the organic electroluminescent devices prepared in the above examples and comparative examples were tested using the Hangzhou remote-produced OLED-1000 multichannel accelerated aging life and photochromic performance analysis system, and the test results are shown in Table 4.
TABLE 4
As can be seen from the above table, when the hole injection layer is prepared by a solution method, compared to the conventional HIL02, the compound provided by the present invention as a hole injection material of an organic electroluminescent device can improve the light emitting efficiency and reduce the driving voltage.
The present invention is illustrated in detail by the examples described above, but the present invention is not limited to the details described above, i.e., it is not intended that the present invention be implemented by relying on the details described above. It should be understood by those skilled in the art that any modification of the present invention, equivalent substitutions of the raw materials of the product of the present invention, addition of auxiliary components, selection of specific modes, etc., are within the scope and disclosure of the present invention.