CN106098958A - White light organic electroluminescent device and preparation method thereof - Google Patents
White light organic electroluminescent device and preparation method thereof Download PDFInfo
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- 238000002360 preparation method Methods 0.000 title claims abstract description 19
- 239000001044 red dye Substances 0.000 claims abstract description 66
- 239000000463 material Substances 0.000 claims abstract description 65
- 239000000975 dye Substances 0.000 claims abstract description 63
- 238000001704 evaporation Methods 0.000 claims description 144
- 230000008020 evaporation Effects 0.000 claims description 142
- 230000003247 decreasing effect Effects 0.000 claims description 29
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 claims description 2
- 238000000605 extraction Methods 0.000 abstract description 10
- 239000010410 layer Substances 0.000 description 102
- 239000000758 substrate Substances 0.000 description 8
- CUJRVFIICFDLGR-UHFFFAOYSA-N acetylacetonate Chemical compound CC(=O)[CH-]C(C)=O CUJRVFIICFDLGR-UHFFFAOYSA-N 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- -1 then Substances 0.000 description 6
- 238000005401 electroluminescence Methods 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
- 239000002019 doping agent Substances 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 2
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- 238000001505 atmospheric-pressure chemical vapour deposition Methods 0.000 description 2
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- 229910052737 gold Inorganic materials 0.000 description 2
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- 229910001385 heavy metal Inorganic materials 0.000 description 2
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- 239000002346 layers by function Substances 0.000 description 2
- 238000004518 low pressure chemical vapour deposition Methods 0.000 description 2
- 239000011777 magnesium Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
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- 238000000623 plasma-assisted chemical vapour deposition Methods 0.000 description 2
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- VQGHOUODWALEFC-UHFFFAOYSA-N 2-phenylpyridine Chemical compound C1=CC=CC=C1C1=CC=CC=N1 VQGHOUODWALEFC-UHFFFAOYSA-N 0.000 description 1
- DHDHJYNTEFLIHY-UHFFFAOYSA-N 4,7-diphenyl-1,10-phenanthroline Chemical compound C1=CC=CC=C1C1=CC=NC2=C1C=CC1=C(C=3C=CC=CC=3)C=CN=C21 DHDHJYNTEFLIHY-UHFFFAOYSA-N 0.000 description 1
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- ZOKIJILZFXPFTO-UHFFFAOYSA-N 4-methyl-n-[4-[1-[4-(4-methyl-n-(4-methylphenyl)anilino)phenyl]cyclohexyl]phenyl]-n-(4-methylphenyl)aniline Chemical compound C1=CC(C)=CC=C1N(C=1C=CC(=CC=1)C1(CCCCC1)C=1C=CC(=CC=1)N(C=1C=CC(C)=CC=1)C=1C=CC(C)=CC=1)C1=CC=C(C)C=C1 ZOKIJILZFXPFTO-UHFFFAOYSA-N 0.000 description 1
- LTUJKAYZIMMJEP-UHFFFAOYSA-N 9-[4-(4-carbazol-9-yl-2-methylphenyl)-3-methylphenyl]carbazole Chemical compound C12=CC=CC=C2C2=CC=CC=C2N1C1=CC=C(C=2C(=CC(=CC=2)N2C3=CC=CC=C3C3=CC=CC=C32)C)C(C)=C1 LTUJKAYZIMMJEP-UHFFFAOYSA-N 0.000 description 1
- VFUDMQLBKNMONU-UHFFFAOYSA-N 9-[4-(4-carbazol-9-ylphenyl)phenyl]carbazole Chemical compound C12=CC=CC=C2C2=CC=CC=C2N1C1=CC=C(C=2C=CC(=CC=2)N2C3=CC=CC=C3C3=CC=CC=C32)C=C1 VFUDMQLBKNMONU-UHFFFAOYSA-N 0.000 description 1
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- UJOBWOGCFQCDNV-UHFFFAOYSA-N Carbazole Natural products C1=CC=C2C3=CC=CC=C3NC2=C1 UJOBWOGCFQCDNV-UHFFFAOYSA-N 0.000 description 1
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- 102100028692 T-cell leukemia translocation-altered gene protein Human genes 0.000 description 1
- DGEZNRSVGBDHLK-UHFFFAOYSA-N [1,10]phenanthroline Chemical class C1=CN=C2C3=NC=CC=C3C=CC2=C1 DGEZNRSVGBDHLK-UHFFFAOYSA-N 0.000 description 1
- WNYFTWLTSLCQLO-UHFFFAOYSA-N [As].N1=CC=CC=C1 Chemical class [As].N1=CC=CC=C1 WNYFTWLTSLCQLO-UHFFFAOYSA-N 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
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- UFVXQDWNSAGPHN-UHFFFAOYSA-K bis[(2-methylquinolin-8-yl)oxy]-(4-phenylphenoxy)alumane Chemical compound [Al+3].C1=CC=C([O-])C2=NC(C)=CC=C21.C1=CC=C([O-])C2=NC(C)=CC=C21.C1=CC([O-])=CC=C1C1=CC=CC=C1 UFVXQDWNSAGPHN-UHFFFAOYSA-K 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 229920001940 conductive polymer Polymers 0.000 description 1
- XCJYREBRNVKWGJ-UHFFFAOYSA-N copper(II) phthalocyanine Chemical compound [Cu+2].C12=CC=CC=C2C(N=C2[N-]C(C3=CC=CC=C32)=N2)=NC1=NC([C]1C=CC=CC1=1)=NC=1N=C1[C]3C=CC=CC3=C2[N-]1 XCJYREBRNVKWGJ-UHFFFAOYSA-N 0.000 description 1
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- 229910003460 diamond Inorganic materials 0.000 description 1
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- 230000005684 electric field Effects 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 229920002313 fluoropolymer Polymers 0.000 description 1
- 239000004811 fluoropolymer Substances 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 229910052738 indium Inorganic materials 0.000 description 1
- APFVFJFRJDLVQX-UHFFFAOYSA-N indium atom Chemical compound [In] APFVFJFRJDLVQX-UHFFFAOYSA-N 0.000 description 1
- 229910052809 inorganic oxide Inorganic materials 0.000 description 1
- 229910052741 iridium Inorganic materials 0.000 description 1
- GKOZUEZYRPOHIO-UHFFFAOYSA-N iridium atom Chemical compound [Ir] GKOZUEZYRPOHIO-UHFFFAOYSA-N 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- IBHBKWKFFTZAHE-UHFFFAOYSA-N n-[4-[4-(n-naphthalen-1-ylanilino)phenyl]phenyl]-n-phenylnaphthalen-1-amine Chemical compound C1=CC=CC=C1N(C=1C2=CC=CC=C2C=CC=1)C1=CC=C(C=2C=CC(=CC=2)N(C=2C=CC=CC=2)C=2C3=CC=CC=C3C=CC=2)C=C1 IBHBKWKFFTZAHE-UHFFFAOYSA-N 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 239000011368 organic material Substances 0.000 description 1
- 229910052697 platinum Inorganic materials 0.000 description 1
- 229920000058 polyacrylate Polymers 0.000 description 1
- 229920002647 polyamide Polymers 0.000 description 1
- 229920000767 polyaniline Polymers 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 102000004196 processed proteins & peptides Human genes 0.000 description 1
- 108090000765 processed proteins & peptides Proteins 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 229910052814 silicon oxide Inorganic materials 0.000 description 1
- 238000010025 steaming Methods 0.000 description 1
- 229910052712 strontium Inorganic materials 0.000 description 1
- CIOAGBVUUVVLOB-UHFFFAOYSA-N strontium atom Chemical compound [Sr] CIOAGBVUUVVLOB-UHFFFAOYSA-N 0.000 description 1
- TVIVIEFSHFOWTE-UHFFFAOYSA-K tri(quinolin-8-yloxy)alumane Chemical compound [Al+3].C1=CN=C2C([O-])=CC=CC2=C1.C1=CN=C2C([O-])=CC=CC2=C1.C1=CN=C2C([O-])=CC=CC2=C1 TVIVIEFSHFOWTE-UHFFFAOYSA-K 0.000 description 1
- RFDGVZHLJCKEPT-UHFFFAOYSA-N tris(2,4,6-trimethyl-3-pyridin-3-ylphenyl)borane Chemical compound CC1=C(B(C=2C(=C(C=3C=NC=CC=3)C(C)=CC=2C)C)C=2C(=C(C=3C=NC=CC=3)C(C)=CC=2C)C)C(C)=CC(C)=C1C1=CC=CN=C1 RFDGVZHLJCKEPT-UHFFFAOYSA-N 0.000 description 1
- 238000001039 wet etching Methods 0.000 description 1
Classifications
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting devices
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting devices
- H10K50/10—OLEDs or polymer light-emitting diodes [PLED]
- H10K50/11—OLEDs or polymer light-emitting diodes [PLED] characterised by the electroluminescent [EL] layers
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K71/00—Manufacture or treatment specially adapted for the organic devices covered by this subclass
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- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Electroluminescent Light Sources (AREA)
Abstract
The present invention relates to a kind of white light organic electroluminescent device and preparation method thereof.Above-mentioned white light organic electroluminescent device includes anode layer, cathode layer and the organic function layer between anode layer and cathode layer, and organic function layer includes that luminescent layer, luminescent layer include red and green luminous layer；Red and green luminous layer includes material of main part and the red dye being doped in material of main part and green glow dyestuff；The doping content of red dye reduces along anode layer to the direction of cathode layer, and the doping content of green glow dyestuff is constant to the direction of cathode layer along anode layer.In above-mentioned white light organic electroluminescent device, red dye and green glow dyestuff all can be located at the position that its respective optimal light is taken out, thus add the light extraction efficiency of white light organic electroluminescent device, extend the service life of white light organic electroluminescent device simultaneously.Moreover, it relates to the preparation method of above-mentioned white light organic electroluminescent device.
Description
Technical field
The present invention relates to organic electroluminescence device technical field, particularly relate to a kind of white light organic electroluminescent device
And preparation method thereof.
Background technology
Organic electroluminescent refers to the phenomenon that luminous organic material is luminous under the excitation of electric current or electric field.Organic
When electroluminescent device (OLED, Organic Light-Emitting Diode) has active illuminating, luminous efficiency height, reaction
Between fast (1 μ s magnitude), running voltage low (3v～10v), wide viewing angle (＞ more than 175 °), plate thickness thin (＜ 1mm), power consumption
Low, operating temperature range wide (40 DEG C～85 DEG C) and can realize the plurality of advantages such as Flexible Displays, therefore causes extensively
Concern.
White light organic electroluminescent device (WOLED, White Organic Light-Emitting Diode) is OLED
Important branch, flat pannel display with illumination application there are huge potentiality, over nearly more than 10 years always people research focus.
Wherein, red-green glow dyestuff codope is a kind of technology conventional in WOLED, but, owing to the centre wavelength of two kinds of light has bigger
Gap, traditional method by red-green glow dyestuff codope can only make a kind of light be positioned at the position that optimal light is taken out, and now
Another kind of light has deflected away from optimal light extracting position, and the light extraction efficiency causing WOLED is the highest.
Summary of the invention
Based on this, it is necessary to for the problem that the light extraction efficiency of traditional white light organic electroluminescent device is the highest, it is provided that
A kind of white light organic electroluminescent device that can improve light extraction efficiency.
A kind of white light organic electroluminescent device, including anode layer, cathode layer and be positioned at described anode layer and described the moon
Organic function layer between the layer of pole,
Described organic function layer includes that luminescent layer, described luminescent layer include red and green luminous layer；
Described red and green luminous layer includes material of main part and is doped in the red dye in described material of main part and green glow dye
Material；
The doping content of described red dye reduces along described anode layer to the direction of described cathode layer, and described green glow dye
The doping content of material is constant to the direction of described cathode layer along described anode layer.
In above-mentioned white light organic electroluminescent device, due to the doping content of red dye along anode layer to the side of cathode layer
To reduction, and the doping content of green glow dyestuff is constant to the direction of cathode layer along anode layer, then, red dye and green glow dyestuff
All can be located at the position that its respective optimal light is taken out, thus add the light extraction efficiency of white light organic electroluminescent device, with
Time extend service life of white light organic electroluminescent device.
Wherein in an embodiment, the doping content of described red dye is 0.1wt%～3wt%.
Wherein in an embodiment, the doping content of described green glow dyestuff is 5wt%～20wt%.
Wherein in an embodiment, the doping content of described red dye along described anode layer to the side of described cathode layer
Keep to first constant, afterwards monotone decreasing, finally keep constant.
Wherein in an embodiment, the doping content of described red dye along described anode layer to the side of described cathode layer
To monotone decreasing.
Additionally, also provide for the preparation method of a kind of white light organic electroluminescent device, including forming the anode layer of stacking, having
Machine functional layer and the step of cathode layer, described organic function layer includes that luminescent layer, described luminescent layer include red and green luminous layer, described
Red and green luminous layer includes material of main part and is doped in the red dye in described material of main part and green glow dyestuff, is formed red green
The step of luminescent layer is:
Being deposited with described material of main part, described red dye and described green glow dyestuff, evaporation rate is as follows simultaneously:
The evaporation rate of described material of main part and described green glow dyestuff keeps constant；
Described red dye is decreased to the second evaporation rate by the first evaporation rate.
In the preparation method of above-mentioned white light organic electroluminescent device, owing to red dye is decreased to by the first evaporation rate
Second evaporation rate, in the luminescent layer obtained, the doping content of red dye reduces along anode layer to the direction of cathode layer, and green
The doping content of photoinitiator dye is constant to the direction of cathode layer along anode layer, then, red dye and green glow dyestuff all can be located at it
The position that respective optimal light is taken out, thus add the light extraction efficiency of white light organic electroluminescent device, extend white simultaneously
The service life of light organic electroluminescence device.
Wherein in an embodiment, the step forming red and green luminous layer is:
Being deposited with described material of main part, described red dye and described green glow dyestuff, the evaporation time is 120s～720s simultaneously,
Evaporation rate is as follows:
The evaporation rate of described material of main part and described green glow dyestuff remain respectively 0.04nm/s～0.24nm/s and 6 ×
10-3Nm/s～3.6 × 10-2nm/s；
First evaporation rate of described red dye remains 3 × 10-4Nm/s～2 × 10-3Nm/s, the evaporation time is 40s
～240s；Described by the first evaporation rate monotone decreasing to the second evaporation rate afterwards, described second evaporation rate is 5 × 10- 5Nm/s～6 × 10-4Nm/s, the evaporation time is 40s～240s；Finally keeping described second evaporation rate, the evaporation time is 40s
～240s.
Wherein in an embodiment, the step forming red and green luminous layer is:
Being deposited with described material of main part, described red dye and described green glow dyestuff, the evaporation time is 300s simultaneously, evaporation speed
Rate is as follows:
The evaporation rate of described material of main part and described green glow dyestuff remains 0.1nm/s and 1.5 × 10 respectively-2nm/s；
First evaporation rate of described red dye remains 8 × 10-4Nm/s, the evaporation time is 100s；Afterwards by described
First evaporation rate monotone decreasing to the second evaporation rate, described second evaporation rate is 2 × 10-4Nm/s, the evaporation time is
100s；Finally keeping described second evaporation rate, the evaporation time is 100s.
Wherein in an embodiment, the step forming red and green luminous layer is:
Being deposited with described material of main part, described red dye and described green glow dyestuff, the evaporation time is 120s～720s simultaneously,
Evaporation rate is as follows:
The evaporation rate of described material of main part and described green glow dyestuff remain respectively 0.04nm/s～0.24nm/s and 6 ×
10-3Nm/s～3.6 × 10-2nm/s；
Described red dye is by described first evaporation rate monotone decreasing to described second evaporation rate, described first evaporation
Speed is 3 × 10-4Nm/s～2 × 10-3Nm/s, described second evaporation rate is 5 × 10-5Nm/s～6 × 10-4nm/s。
Wherein in an embodiment, the step forming red and green luminous layer is:
Being deposited with described material of main part, described red dye and described green glow dyestuff, the evaporation time is 300s simultaneously, evaporation speed
Rate is as follows:
The evaporation rate of described material of main part and described green glow dyestuff remains 0.1nm/s and 1.5 × 10 respectively-2nm/s；
Described red dye is by described first evaporation rate monotone decreasing to described second evaporation rate, described first evaporation
Speed is 8 × 10-4Nm/s, described second evaporation rate is 2 × 10-4nm/s。
Accompanying drawing explanation
Fig. 1 is the structural representation of the white light organic electroluminescent device of an embodiment；
Fig. 2 is the flow chart of the preparation method of the white light organic electroluminescent device of an embodiment；
Fig. 3 is m-evaporation rate curve when being in the preparation process of the white light organic electroluminescent device of embodiment 1；
Fig. 4 is m-evaporation rate curve when being in the preparation process of the white light organic electroluminescent device of embodiment 2.
Detailed description of the invention
Understandable, below in conjunction with the accompanying drawings to the present invention for enabling the above-mentioned purpose of the present invention, feature and advantage to become apparent from
Detailed description of the invention be described in detail.Elaborate a lot of detail in the following description so that fully understanding this
Bright.But the present invention can implement to be much different from alternate manner described here, and those skilled in the art can be not
Doing similar improvement in the case of running counter to intension of the present invention, therefore the present invention is not limited by following public specific embodiment.
Referring to Fig. 1, the white light organic electroluminescent device 100 of an embodiment includes substrate 110, the sun stacked gradually
Pole layer 120, organic function layer 130 and cathode layer 140.Wherein, the position of anode layer 120 and cathode layer 140 can exchange.Organic
Functional layer 130 includes hole transmission layer 131 (HTL), luminescent layer 132 and electron transfer layer 133 (ETL).White light organic electroluminescence is sent out
Optical device 100 is luminous under the driving of additional power source 200.
In the white light organic electroluminescent device 100 of the present invention, substrate 110 is glass or flexible substrate or metal foil
Sheet, a kind of material during wherein flexible substrate is ultra-thin solid-state thin slice, polyesters or poly-peptide imine compound.
The white light organic electroluminescent device 100 Anodic layer 120 of the present invention generally use inorganic, metal oxide (as
ITO, ZnO etc.), organic conductive polymer (such as PEDOT:PSS, PANI etc.) or high-work-function metal material (as gold, copper, silver,
Platinum etc.).
White light organic electroluminescent device 100 hole-transporting layer 131 of the present invention be aromatic diamine compounds or
Person's aromatic triamine compounds, such as the one in the materials such as NPB, TPD, α-NPD, TAPC.
In the white light organic electroluminescent device 100 of the present invention luminescent layer 132 include blue light-emitting 1321 (B-EML),
Charge generation layer 1322 (CGL) and red and green luminous layer 1323 (R/G-EML).
Wherein, red and green luminous layer 1323 includes material of main part and the red dye being doped in material of main part and green glow
Dyestuff.Material of main part has higher triplet, can effectively transfer energy to dopant material, make dopant material send out
Light.Material of main part generally uses a kind of material of carbazole compound (such as CBP, CDBP, TCTA, mCP).Dopant material includes red
Photoinitiator dye and green glow dyestuff.Red dye is selected from the phosphor material of atom centered by heavy metal iridium (Ir), such as Ir (piq)2
(acac)、Ir(m-piq)2(acac)、Ir(DPQ)2(acac) etc..Green glow dyestuff is selected from atom centered by heavy metal (Ir)
Phosphor material, such as Ir (ppy)3、Ir(pbi)2(acac)、Ir(nbi)2(acac)、Ir(pybi)2(acac) etc..
The doping content edge of red dye in the red and green luminous layer 1323 of the white light organic electroluminescent device 100 of the present invention
Anode layer 120 to the direction of cathode layer 140 reduce, and the doping content of green glow dyestuff along anode layer 120 to the side of cathode layer 140
To constant.Wherein, the doping content of red dye refers to the red dye doping content relative to material of main part, green glow dyestuff
Doping content refer to the green glow dyestuff doping content relative to material of main part.In one preferably embodiment, HONGGUANG contaminates
The doping content of material is 0.1wt%～3wt%.The doping content of green glow dyestuff is 5wt%～20wt%.Certainly, red dye
It is not limited to this with the doping content of green glow dyestuff.
In one preferably embodiment, the doping content of red dye first keeps not along anode layer to the direction of cathode layer
Become, afterwards monotone decreasing, finally keep constant.In another preferably embodiment, the doping content of red dye is along anode
Layer is to the direction monotone decreasing of cathode layer.Both embodiments can make red dye and green glow dyestuff be respectively positioned on it each
The position taken out of optimal light, thus add the light extraction efficiency of white light organic electroluminescent device, extend white light has simultaneously
The service life of organic electroluminescence devices.
In the white light organic electroluminescent device 100 of the present invention electron transfer layer 133 be metal organic complex (as
Alq3, BAlq), arsenic pyridine class (such as 3TPYMB), o-phenanthroline class (such as BCP, BPhen), diazoles (such as PBD, OXD-7) or miaow
A kind of material in azole (such as TPBI) compound-material.
In the white light organic electroluminescent device 100 of the present invention, cathode layer 140 can be the merits such as lithium, magnesium, calcium, strontium, aluminum, indium
Metallic film that function is relatively low or they and copper, the alloy firm of gold, silver.The present invention be preferably Mg:Ag alloy-layer the most successively,
Ag layer or LiF layer successively, Al layer.
Additionally, the white light organic electroluminescent device 100 of the present invention can also include being arranged at substrate 110 and anode layer
Cushion (not shown) between 120.Cushion is in order to promote the levelness of substrate and to prevent the intrusion of impurity.Cushion is permissible
Use SiNxAnd/or SiOxBy such as plasma enhanced chemical vapor deposition (PECVD) technology, atmospheric pressure cvd (APCVD) skill
The various deposition techniques of art and low pressure chemical vapor deposition (LPCVD) technology etc carry out buffer layer 110.Further, it is also possible at anode layer
Anode buffer layer (not shown) is set between 120 and hole transmission layer 131, typically uses phthalocyanines, polyacrylate, polyamides
A kind of material in imines, fluoropolymer, inorganic fluoriding salt, inorganic oxide or diamond, such as CuPc etc..
Refer to Fig. 2, the preparation method of the white light organic electroluminescent device of an embodiment, comprise the following steps:
S100, on a substrate 110 formation anode layer 120.
The method that can use such as wet etching forms anode layer 120 on a substrate 110.
S200, on anode layer 120 formed organic function layer 130, organic function layer 130 includes luminescent layer 132, luminescent layer
132 include that red and green luminous layer 1323, red and green luminous layer 1323 include material of main part and the HONGGUANG dye being doped in material of main part
Material and green glow dyestuff, the step forming red and green luminous layer 1323 is:
Being deposited with material of main part, red dye and green glow dyestuff, evaporation rate is as follows simultaneously:
The evaporation rate of material of main part and green glow dyestuff keeps constant；
Red dye is decreased to the second evaporation rate by the first evaporation rate.
The method that can use three source evaporations carries out grade doping, respectively by material of main part, red dye and green glow dyestuff
It is placed in different evaporation sources, by controlling the evaporation rate of three evaporation sources, makes material of main part and the evaporation of green glow dyestuff
Speed keeps constant, makes red dye be decreased to the second evaporation rate by the first evaporation rate simultaneously.
It should be noted that the first evaporation rate can directly monotone decreasing to the second evaporation rate；Also can be first by first
Evaporation rate keeps after a period of time monotone decreasing again to the second evaporation rate, finally to continue the second evaporation rate is kept one
The section time, complete whole evaporation process；Can also be by the first evaporation rate monotone decreasing to the first evaporation rate and the second evaporation
A certain numerical value between speed, repeats said process several times afterwards, until being decreased to the second evaporation rate, completes whole steaming
Plated journey.
In one preferably embodiment, the step forming red and green luminous layer 1323 is:
Being deposited with material of main part, red dye and green glow dyestuff, the evaporation time is 120s～720s, and evaporation rate is such as simultaneously
Under:
The evaporation rate of material of main part and green glow dyestuff remains 0.04nm/s～0.24nm/s and 6 × 10 respectively-3nm/s
～3.6 × 10-2nm/s；
First evaporation rate of red dye remains 3 × 10-4Nm/s～2 × 10-3Nm/s, the evaporation time be 40s～
240s；Afterwards by the first evaporation rate monotone decreasing to the second evaporation rate, the second evaporation rate is 5 × 10-5Nm/s～6 ×
10-4Nm/s, the evaporation time is 40s～240s；Finally keeping the second evaporation rate, evaporation time is 40s～240s.
By in the red and green luminous layer 1323 that the present embodiment prepares, the doping content of red dye is along anode layer 120
First keep to the direction of cathode layer 140 constant, afterwards monotone decreasing, finally keep constant.
In another preferably embodiment, the step forming red and green luminous layer 1323 is:
Being deposited with material of main part, red dye and green glow dyestuff, the evaporation time is 120s～720s, and evaporation rate is such as simultaneously
Under:
The evaporation rate of material of main part and green glow dyestuff remains 0.04nm/s～0.24nm/s and 6 × 10 respectively-3nm/s
～3.6 × 10-2nm/s；
Red dye is by the first evaporation rate monotone decreasing to the second evaporation rate, and the first evaporation rate is 3 × 10-4nm/s
～2 × 10-3Nm/s, the second evaporation rate is 5 × 10-5Nm/s～6 × 10-4nm/s。
By in the red and green luminous layer 1323 that the present embodiment prepares, the doping content of red dye is along anode layer 120
To the direction monotone decreasing of cathode layer 140.
S300, on organic function layer 130 formed cathode layer 140, obtain white light organic electroluminescent device 100.
The method that can use evaporation forms cathode layer 140 on organic function layer 130.
In the preparation method of above-mentioned white light organic electroluminescent device, owing to red dye is decreased to by the first evaporation rate
Second evaporation rate, in the luminescent layer obtained, the doping content of red dye reduces along anode layer to the direction of cathode layer, and green
The doping content of photoinitiator dye is constant to the direction of cathode layer along anode layer, then, red dye and green glow dyestuff all can be located at it
The position that respective optimal light is taken out, thus add the light extraction efficiency of white light organic electroluminescent device, extend white simultaneously
The service life of light organic electroluminescence device.
Below in conjunction with specific embodiments and the drawings, the white light organic electroluminescent device of the present invention is carried out further
Bright.
Embodiment 1
Referring to Fig. 3, the step of the red and green luminous layer forming the present embodiment is:
Being deposited with material of main part, red dye and green glow dyestuff, the evaporation time is 300s, and evaporation rate is as follows simultaneously:
The evaporation rate of material of main part and green glow dyestuff remains 0.1nm/s and 1.5 × 10 respectively-2nm/s。
First evaporation rate of red dye remains 8 × 10-4Nm/s, the evaporation time is 100s；Afterwards by the first evaporation
Rate monotonic is decremented to the second evaporation rate, and the second evaporation rate is 2 × 10-4Nm/s, the evaporation time is 100s；Finally keep
Two evaporation rate, the evaporation time is 100s.
By light extraction efficiency (the outer quantum effect of the white light organic electroluminescent device that the preparation method of the present embodiment obtains
Rate) about 2% can be improved.
Embodiment 2
Referring to Fig. 4, the step of the red and green luminous layer forming the present embodiment is:
Being deposited with material of main part, red dye and green glow dyestuff, the evaporation time is 300s, and evaporation rate is as follows simultaneously:
The evaporation rate of material of main part and green glow dyestuff remains 0.1nm/s and 1.5 × 10 respectively-2nm/s。
Red dye is by the first evaporation rate monotone decreasing to the second evaporation rate, and the first evaporation rate is 8 × 10-4nm/
S, the second evaporation rate is 2 × 10-4nm/s。
By light extraction efficiency (the outer quantum effect of the white light organic electroluminescent device that the preparation method of the present embodiment obtains
Rate) about 3% can be improved.
Each technical characteristic of embodiment described above can combine arbitrarily, for making description succinct, not to above-mentioned reality
The all possible combination of each technical characteristic executed in example is all described, but, as long as the combination of these technical characteristics is not deposited
In contradiction, all it is considered to be the scope that this specification is recorded.
Embodiment described above only have expressed the several embodiments of the present invention, and it describes more concrete and detailed, but also
Can not therefore be construed as limiting the scope of the patent.It should be pointed out that, come for those of ordinary skill in the art
Saying, without departing from the inventive concept of the premise, it is also possible to make some deformation and improvement, these broadly fall into the protection of the present invention
Scope.Therefore, the protection domain of patent of the present invention should be as the criterion with claims.
Claims (10)
1. a white light organic electroluminescent device, including anode layer, cathode layer and be positioned at described anode layer and described negative electrode
Organic function layer between Ceng, it is characterised in that
Described organic function layer includes that luminescent layer, described luminescent layer include red and green luminous layer；
Described red and green luminous layer includes material of main part and is doped in the red dye in described material of main part and green glow dyestuff；
The doping content of described red dye reduces along described anode layer to the direction of described cathode layer, and described green glow dyestuff
Doping content is constant to the direction of described cathode layer along described anode layer.
White light organic electroluminescent device the most according to claim 1, it is characterised in that the doping of described red dye is dense
Degree is 0.1wt%～3wt%.
White light organic electroluminescent device the most according to claim 1, it is characterised in that the doping of described green glow dyestuff is dense
Degree is 5wt%～20wt%.
White light organic electroluminescent device the most according to claim 1, it is characterised in that the doping of described red dye is dense
Spend along described anode layer first keep to the direction of described cathode layer constant, afterwards monotone decreasing, finally keep constant.
White light organic electroluminescent device the most according to claim 1, it is characterised in that the doping of described red dye is dense
Spend along described anode layer to the direction monotone decreasing of described cathode layer.
6. a preparation method for white light organic electroluminescent device, including forming the anode layer of stacking, organic function layer and the moon
The step of pole layer, described organic function layer includes that luminescent layer, described luminescent layer include red and green luminous layer, it is characterised in that described
Red and green luminous layer includes material of main part and is doped in the red dye in described material of main part and green glow dyestuff, is formed red green
The step of luminescent layer is:
Being deposited with described material of main part, described red dye and described green glow dyestuff, evaporation rate is as follows simultaneously:
The evaporation rate of described material of main part and described green glow dyestuff keeps constant；
Described red dye is decreased to the second evaporation rate by the first evaporation rate.
The preparation method of white light organic electroluminescent device the most according to claim 6, it is characterised in that form red green
The step of photosphere is:
Being deposited with described material of main part, described red dye and described green glow dyestuff, the evaporation time is 120s～720s simultaneously, evaporation
Speed is as follows:
The evaporation rate of described material of main part and described green glow dyestuff remains 0.04nm/s～0.24nm/s and 6 × 10 respectively- 3Nm/s～3.6 × 10-2nm/s；
First evaporation rate of described red dye remains 3 × 10-4Nm/s～2 × 10-3Nm/s, the evaporation time be 40s～
240s；Described by the first evaporation rate monotone decreasing to the second evaporation rate afterwards, described second evaporation rate is 5 × 10-5nm/
S～6 × 10-4Nm/s, the evaporation time is 40s～240s；Finally keep described second evaporation rate, the evaporation time be 40s～
240s。
The preparation method of white light organic electroluminescent device the most according to claim 7, it is characterised in that form red green
The step of photosphere is:
Being deposited with described material of main part, described red dye and described green glow dyestuff, the evaporation time is 300s, and evaporation rate is such as simultaneously
Under:
The evaporation rate of described material of main part and described green glow dyestuff remains 0.1nm/s and 1.5 × 10 respectively-2nm/s；
First evaporation rate of described red dye remains 8 × 10-4Nm/s, the evaporation time is 100s；Afterwards by described first
Evaporation rate monotone decreasing is 2 × 10 to the second evaporation rate, described second evaporation rate-4Nm/s, the evaporation time is 100s；?
Described second evaporation rate of rear holding, the evaporation time is 100s.
The preparation method of white light organic electroluminescent device the most according to claim 6, it is characterised in that form red green
The step of photosphere is:
Being deposited with described material of main part, described red dye and described green glow dyestuff, the evaporation time is 120s～720s simultaneously, evaporation
Speed is as follows:
The evaporation rate of described material of main part and described green glow dyestuff remains 0.04nm/s～0.24nm/s and 6 × 10 respectively- 3Nm/s～3.6 × 10-2nm/s；
Described red dye is by described first evaporation rate monotone decreasing to described second evaporation rate, described first evaporation rate
It is 3 × 10-4Nm/s～2 × 10-3Nm/s, described second evaporation rate is 5 × 10-5Nm/s～6 × 10-4nm/s。
The preparation method of white light organic electroluminescent device the most according to claim 9, it is characterised in that formed red green
The step of luminescent layer is:
Being deposited with described material of main part, described red dye and described green glow dyestuff, the evaporation time is 300s, and evaporation rate is such as simultaneously
Under:
The evaporation rate of described material of main part and described green glow dyestuff remains 0.1nm/s and 1.5 × 10 respectively-2nm/s；
Described red dye is by described first evaporation rate monotone decreasing to described second evaporation rate, described first evaporation rate
It is 8 × 10-4Nm/s, described second evaporation rate is 2 × 10-4nm/s。
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