KR101587678B1 - Light to heat conversion film with integrated base-layer and light to heat conversion layer and transfer film for oled using the same - Google Patents

Abstract

The present invention relates to a photothermal conversion film and a transfer film for an OLED (Organic Light Emitting Diode) using the same, and more particularly, to a photovoltaic conversion film comprising a photothermal conversion film in which a base layer and a photothermal conversion layer are integrated, Which can improve the OLED productivity, and a transfer film for an OLED using the same.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a photo-thermal conversion film having a substrate layer and a photo-thermal conversion layer integrated with each other, and a transfer film for an OLED using the same. BACKGROUND ART [0002]

The present invention relates to a photothermal conversion film and a transfer film for an OLED (Organic Light Emitting Diode) using the same, and more particularly, to a photovoltaic conversion film comprising a photothermal conversion film in which a base layer and a photothermal conversion layer are integrated, Which can improve the OLED productivity, and a transfer film for an OLED using the same.

In OLED (Organic Light Emitting Diode), OLED (Organic Light Emitting Diode) has many advantages such as self-luminous property, high luminance, fast response speed, etc., compared with LCD (Liquid Crystal Display).

OLEDs include organic light emitting materials. In the case of such an organic luminescent material, a deposition method has been mainly used. However, in the case of the deposition method, it has been difficult to homogenize the layer of the organic light emitting material to be formed.

In recent years, a photothermal conversion layer and an organic light emitting material layer are formed on a transfer film, and when a light is irradiated with a laser or the like, a material contained in the photothermal conversion layer absorbs light to emit heat, A thermal transfer method is used which is transferred onto a substrate. In the case of the thermal transfer method, the organic light emitting material layer can be homogenized more easily than the vapor deposition method.

However, in the conventional transfer film, as shown in Fig. 1, the photo-thermal conversion layer 20 is separately formed on the base layer 10. In this case, since there are many layers, there is a high possibility that the thickness precision is lowered, When the intermediate layer 30 is coated on the photo-thermal conversion layer 20, there is a high possibility that the photo-thermal conversion layer is damaged due to the solvent.

Background art related to the present invention is a photo-thermal conversion sheet disclosed in Korean Patent Laid-Open Publication No. 10-2011-0069708 (published on June 23, 2011), an organic electroluminescent material sheet using the same, and a method of manufacturing an organic electroluminescent device .

An object of the present invention is to solve the above-mentioned problems, and it is an object of the present invention to provide a light-heat conversion film in which a base layer and a photo-thermal conversion layer are integrated, And a transfer film for OLED using the same.

In order to accomplish the above object, the light-heat conversion film according to an embodiment of the present invention includes a substrate layer including a photo-thermal conversion material, so that the substrate layer and the photo-thermal conversion layer are integrated.

According to another aspect of the present invention, there is provided a transfer film for an OLED, including a base layer including a photo-thermal conversion material and an organic light emitting material layer formed on the base layer including the photo- Layer and the photo-thermal conversion layer are integrated.

The photothermal conversion film according to the present invention has the advantages that the thickness precision is increased and the coating process is reduced as the layer structure is simplified while maintaining the light heat conversion efficiency as it is, . In addition, when the intermediate layer is coated on the photo-thermal conversion layer containing carbon black, damage to the photo-thermal conversion layer due to the solvent can be effectively prevented.

Therefore, in the case of the transfer film for OLED using the photo-thermal conversion film according to the present invention, the productivity of the OLED with high reliability can be improved due to the above-mentioned effects.

1 is a schematic cross-sectional view of a conventional photo-thermal conversion film.
2 is a schematic cross-sectional view of a photo-thermal conversion film according to an embodiment of the present invention.
3 is a schematic cross-sectional view of a photothermal conversion film according to another embodiment of the present invention.
4 is a schematic cross-sectional view of a transfer film for an OLED according to an embodiment of the present invention.
5 is a schematic cross-sectional view of a transfer film for an OLED according to another embodiment of the present invention.

Advantages and features of the present invention and methods of achieving them will become apparent with reference to the embodiments described in detail below. It should be understood, however, that the invention is not limited to the disclosed embodiments, but is capable of many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, To fully disclose the scope of the invention to those skilled in the art, and the invention is only defined by the scope of the claims.

Hereinafter, a photothermal conversion film of the present invention and a transfer film for an OLED using the same will be described in detail.

2 is a schematic cross-sectional view of a photo-thermal conversion film 100 according to an embodiment of the present invention.

Referring to FIG. 2, a photo-thermal conversion film 100 according to an embodiment of the present invention includes a base layer 110 including a photo-thermal conversion material 111.

Thus, the photo-thermal conversion film 100 of the present invention is characterized in that the base layer and the photo-thermal conversion layer are integrated as compared with the conventional photo-thermal conversion film.

The photothermal conversion material 111 included in the base layer 110 absorbs incident radiation (e.g., laser light) to enable transfer of the transfer layer from the heat transfer donor to the permanent receiver, and at least a portion of the incident radiation Heat.

The photo-thermal conversion material 111 absorbs light in the infrared, visible, and / or ultraviolet regions of the electromagnetic spectrum.

The photo-thermal conversion material 111 of the present invention can be used in a wide variety of applications including, for example, dyes (such as visible light dyes, ultraviolet dyes, infrared dyes, fluorescent dyes and radiation polarized dyes), pigments, metals, metal compounds, Materials.

Among the above materials, in the present invention, the preferable photo-thermal conversion material 111 is preferably a carbon black or a tungsten oxide-based material. In the case of carbon black, the ability to absorb laser light and emit it as heat is excellent. The tungsten oxide-based material has excellent infrared absorbing ability and is excellent in light-heat conversion effect upon laser irradiation.

In particular, the tungsten oxide-based materials may include tungsten oxide powder, such as WO _{2 .72.}

Further, the tungsten oxide-based material may include hydrogen or metal-containing tungsten oxide (M _x WO ₃ , where M is hydrogen or a metal, 0.1 <x <1) powder. The metal may be selected from the group consisting of Li, Na, K, Rb, Cs, Ca, Ba, Sr, Fe, Sn, Mo, Nb, Ta, Ni, Pd, Pt, Cu, Ag, Au, Zn, Cd, And Tl. Examples of the metal-containing tungsten oxide may include K _{0 .33} WO ₃ , Rb _{0 .33} WO ₃ , Cs _{0 .33} WO ₃ , and the like. Cs _{0 .33} WO ₃ containing cesium (Cs) It is more preferable in terms of light-heat conversion efficiency and light transmittance.

On the other hand, the content of the photothermal conversion material 111 is preferably 10 to 70 parts by weight, particularly preferably 15 to 30 parts by weight, based on 100 parts by weight of the total amount of the substrate layer-containing material.

If the content of the photo-thermal conversion material is less than 10 parts by weight, the light-to-heat conversion efficiency may be lowered and the transfer efficiency may be lowered, if the total amount of the material contained in the substrate layer is 100 parts by weight If the amount is more than 70 parts by weight, the photo-thermal conversion material may hardly be uniformly applied to the substrate layer and may be agglomerated. In addition, it is difficult for resins to form a polymer coating film due to interference of photo-thermal conversion materials. Therefore, there is a possibility that the homogeneity of the transcript is lowered.

The O.D. value of the substrate layer 110 including the photo-thermal conversion material 111 is preferably 0.5 to 4.5.

Optical Density (O.D.) value refers to the amount of light having a constant intensity after a certain wavelength of light passes through the medium, and is used as a concept of absorbance in the present invention.

If the OD value is less than 0.5, the base layer may be sufficiently swollen to be transferred, and a large intensity of incident radiation is required, which may cause damage to the organic luminescent material. If the OD value is more than 4.5, There is a possibility that the inside of the photo-thermal conversion layer is blown up or the rapid temperature rise of the substrate layer may adversely affect the organic luminescent material during the blowing, and the area above the target value may be transferred.

Meanwhile, in the present invention, the thickness of the substrate layer 110 including the photo-thermal conversion material 111 is preferably 50 to 200 μm. When the thickness of the substrate layer 110 including the photo-thermal conversion material is less than 50 占 퐉, the photo-thermal conversion material may not expand to a thickness sufficient for transfer in the film thickness direction during light irradiation. Conversely, when the thickness of the substrate layer 110 including the photo-thermal conversion material is more than 200 μm, the thickness can be simply increased without the effect of increase in transfer efficiency, which is obtained when the thickness increases to 200 μm.

In the present invention, the base layer 110 may be formed of a material selected from the group consisting of polyethylene (PE), polyethylene terephthalate (PP), polypropylene (PP), poly (methyl methacrylate) ), Polycarbonate (PC), polystyrene (PS), and the like. Particularly, PET is preferably used. In the case of PET, since the light transmittance is high at the time of light irradiation for photo-thermal conversion, it is easy to maintain the shape by preventing deformation.

The base layer 110 of the present invention can be prepared by mixing the polymer such as PET and the photo-thermal conversion material 111, and heating and extruding the mixture.

3 is a schematic cross-sectional view of a photothermal conversion film 100 'according to another embodiment of the present invention.

3, the light-heat conversion film of the present invention may further include an intermediate layer 120 formed on a base material layer 110 including the photo-thermal conversion material 111.

The intermediate layer 120 serves to minimize damage and contamination of the transfer material and reduce distortion of the transfer material.

The intermediate layer 120 is preferably made of a polymer film, a metal layer (e.g., a deposited metal layer), an inorganic layer (e.g., an inorganic oxide such as silica, titania, and other metal oxides) A deposition layer and a deposition layer) and an organic / inorganic composite layer. Wherein the organic material includes thermosetting and thermoplastic materials.

The thermosetting materials include, but are not limited to, crosslinkable or crosslinkable polyacrylates, polymethacrylates, polyesters, epoxies, and polyurethanes, resins that can be cross-linked by thermal, .

The thermoplastic material is not limited as long as it can be coated on the photo-thermal conversion layer, for example, as a thermoplastic precursor, and then crosslinked to form a crosslinked intermediate layer.

In the present invention, the intermediate layer 120 may contain an additive including a photoinitiator, a surfactant, a pigment, a plasticizer, and a coating aid.

In the present invention, the thickness of the intermediate layer 120 is preferably 0.1 to 3 占 퐉. If the thickness of the intermediate layer is less than 0.1 탆, the protective effect of the photo-thermal conversion layer 120 may be insufficient. On the other hand, when the thickness of the intermediate layer exceeds 3 占 퐉, the adhesion of the transfer material from the intermediate layer may not be weakened, despite the expansion of the photo-thermal conversion layer during light irradiation.

4 is a schematic cross-sectional view of a transfer film 200 for an OLED according to an embodiment of the present invention.

As shown in FIG. 4, the OLED transfer film 200 of the present invention includes a base layer 110 including a photo-thermal conversion material 111 and a layer 130 of an organic light emitting material.

That is, in the OLED transfer film 200 shown in FIG. 4, an organic light emitting material layer 130 is further formed on the light heat conversion film 100 shown in FIG.

For example, when the light is irradiated by using a laser, the photo-thermal conversion material 111 included in the base layer 110 absorbs light and emits the heat, thereby causing the photo-thermal conversion layer to expand in the film thickness direction, The light emitting material layer 130 is peeled off and transferred to the substrate to be transferred.

5 is a schematic cross-sectional view of a transfer film 200 'for an OLED according to another embodiment of the present invention.

5, the illustrated transfer film for an OLED includes a base layer 110, an intermediate layer 120, and an organic luminescent material layer 130 including a photothermal conversion material 111.

In the case of the example shown in FIG. 5, the same as the example shown in FIG. 4, except that the base layer 110 is protected by the intermediate layer 120, and a detailed description thereof will be omitted.

Example

Hereinafter, the configuration and operation of the present invention will be described in more detail with reference to preferred embodiments of the present invention. It is to be understood, however, that the same is by way of illustration and example only and is not to be construed in a limiting sense.

The contents not described here are sufficiently technically inferior to those skilled in the art, and a description thereof will be omitted.

One. Example  1 to 16

A photo-thermal conversion film specimen was prepared by forming a base layer having a thickness of 103 mu m containing a photothermal conversion material in the composition shown in Table 1 below.

division Photothermal conversion material Polymer Content of photo-thermal conversion material
(Based on 100 parts by weight of the entirety of the substrate layer constituting material) The O.D. value of the substrate layer Example 1 WO _{2 .72} PET 15 parts by weight 0.8 Example 2 WO _{2 .72} PET 20 parts by weight 1.1 Example 3 WO _{2 .72} PET 25 parts by weight 1.4 Example 4 WO _{2 .72} PET 30 parts by weight 1.7 Example 5 Cs _{0 .33} WO ₃ PET 15 parts by weight 0.9 Example 6 Cs _{0 .33} WO ₃ PET 20 parts by weight 1.2 Example 7 Cs _{0 .33} WO ₃ PET 25 parts by weight 1.6 Example 8 Cs _{0 .33} WO ₃ PET 30 parts by weight 1.9 Example 9 Carbon black PET 15 parts by weight 2.2 Example 10 Carbon black PET 20 parts by weight 2.9 Example 11 Carbon black PET 25 parts by weight 3.7 Example 12 Carbon black PET 30 parts by weight 4.5 Example 13 Dye PC-970
(Woo Sung Chemical)
(Phthalo Cyanine type) PET 15 parts by weight 2.0 Example 14 Dye PC-970
(Woo Sung Chemical)
(Phthalo Cyanine type) PET 20 parts by weight 2.8 Example 15 Dye PC-970
(Woo Sung Chemical)
(Phthalo Cyanine type) PET 25 parts by weight 3.6 Example 16 Dye PC-970
(Woo Sung Chemical)
(Phthalo Cyanine type) PET 30 parts by weight 4.2

2. Comparative Example  1 to 6

(1) Comparative Examples 1 to 4

A photo-thermal conversion layer having a thickness of 3 mu m containing the photo-thermal conversion material described in Table 2 was formed on a PET film having a thickness of 100 mu m. In each example, urethane acrylate (20 parts by weight of photo-thermal conversion material) was used as a binder, and Irgacure 651 (0.5 parts by weight of photo-thermal conversion material, manufactured by BASF) was used as a photoinitiator. The solvent used was isopropyl alcohol, and the viscosity of the composition comprising the photo-thermal conversion material, the binder, the photoinitiator and the solvent was 20 cps.

division Photothermal conversion material Comparative Example 1 WO _{2 .72} Comparative Example 2 Cs _{0 .33} WO ₃ Comparative Example 3 Carbon black Comparative Example 4 Dye PC-970 (WOO SUNG CHEMICAL)
(Phthalo Cyanine type)

(2) Comparative Example 5

A photothermal conversion film specimen was prepared in the same manner as in Example 1 except that the content of the photothermal conversion material was changed to 5 parts by weight based on 100 parts by weight of the entirety of the substrate layer constituting material.

(3) Comparative Example 6

A photothermal conversion film specimen was prepared in the same manner as in Example 1 except that the content of the photothermal conversion material was changed to 80 parts by weight based on 100 parts by weight of the entirety of the substrate layer constituting material.

3. Results of physical property evaluation

The evaluation results of physical properties of the photothermal conversion film specimens according to Examples and Comparative Examples are shown in Table 3 below.

Photo-thermal conversion
matter Base layer - light heat
Whether the conversion layer is integrated Photo-thermal conversion
Of matter
content
(Based on 100 parts by weight of the entirety of the substrate layer constituting material) O.D value Light heat
conversion
efficiency(%) thickness
Deviation
(탆) Light heat
Conversion layer damage
Whether Example 1 WO _{2 .72} ○ 15 parts by weight 0.8
(Substrate layer) 200 ± 0.03 × Example 2 WO _{2 .72} ○ 20 parts by weight 1.1
(Substrate layer) 210 ± 0.02 × Example 3 WO _{2 .72} ○ 25 parts by weight 1.4
(Substrate layer) 215 ± 0.03 × Example 4 WO _{2 .72} ○ 30 parts by weight 1.7
(Substrate layer) 220 ± 0.02 × Example 5 Cs _{0 .33} WO ₃ ○ 15 parts by weight 0.9
(Substrate layer) 200 ± 0.03 × Example 6 Cs _{0 .33} WO ₃ ○ 20 parts by weight 1.2
(Substrate layer) 210 ± 0.02 × Example 7 Cs _{0 .33} WO ₃ ○ 25 parts by weight 1.6
(Substrate layer) 215 ± 0.02 × Example 8 Cs _{0 .33} WO ₃ ○ 30 parts by weight 1.9
(Substrate layer) 220 ± 0.03 × Example 9 Carbon black ○ 15 parts by weight 2.2
(Substrate layer) 220 ± 0.03 × Example 10 Carbon black ○ 20 parts by weight 2.9
(Substrate layer) 220 ± 0.03 × Example 11 Carbon black ○ 25 parts by weight 3.7
(Substrate layer) 215 ± 0.05 × Example
12 Carbon black ○ 30 parts by weight 4.5
(Substrate layer) 210 ± 0.08 × Example
13 Dye PC-970
(Woo Sung Chemical)
(Phthalo Cyanine type) ○ 15 parts by weight 2.0
(Substrate layer) 205 ± 0.03 × Example
14 Dye PC-970
(Woo Sung Chemical)
(Phthalo Cyanine type) ○ 20 parts by weight 2.8
(Substrate layer) 210 ± 0.03 × Example
15 Dye PC-970
(Woo Sung Chemical)
(Phthalo Cyanine type) ○ 25 parts by weight 3.6
(Substrate layer) 210 ± 0.05 × Example 16 Dye PC-970
(Woo Sung Chemical)
(Phthalo Cyanine type) ○ 30 parts by weight 4.2
(Substrate layer) 205 ± 0.06 × Comparative Example 1 WO _{2 .72} × - 0.7
(Photo-thermal conversion layer) 200 ± 0.07 ○ Comparative Example 2 Cs _{0 .33} WO ₃ × - 1.2
(Photo-thermal conversion layer) 220 ± 0.05 ○ Comparative Example 3 Carbon black × - 2.6
(Photo-thermal conversion layer) 200 ± 0.09 ○ Comparative Example 4 Dye PC-970
(Woo Sung Chemical)
(Phthalo Cyanine type) × - 4.1
(Photo-thermal conversion layer) 160 ± 0.07 ○ Comparative Example 5 WO _{2 .72} ○ 5 parts by weight 0.4
(Substrate layer) 150 ± 0.02 × Comparative Example 6 WO _{2 .72} ○ 80 parts by weight 3.9
(Substrate layer) 180 ± 0.09 ×

In Table 3, the light-to-heat conversion efficiency was evaluated by irradiating the back side of the substrate layer with 1.0 m / min at 50 W using a laser continuous wave to evaluate the degree of swelling versus initial thickness.

In the case of Examples 1 to 4 in which the base layer and the photo-thermal conversion layer were integrated, the light-to-heat conversion efficiency of the photo-thermal conversion layer was improved compared to Comparative Examples 1 to 4 in which the base layer and the photo- Respectively. In the comparative example, the thickness variation was large and the photothermal conversion layer damage was accompanied, and it was confirmed that the photothermal conversion film according to the embodiment of the present invention is excellent in reliability.

In the case of Examples 1 to 4, OD values of the base layer are different from each other in comparison with Comparative Examples 5 and 6 in which the content of photo-thermal conversion material is different, It can be confirmed that the absolute value of the photo-thermal conversion material contained in the base layer is proportional to the absolute amount. When the content of the photo-thermal conversion material is too much beyond the range of the present invention as in Comparative Example 6, it is difficult for the photo-thermal conversion material to uniformly coat the base layer and coagulate to thereby cause the resin to form a polymer film And the homogeneity of the warrior was lowered.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims. . Accordingly, the true scope of the present invention should be determined by the following claims.

Claims (20)

A photo-thermal conversion film comprising a substrate layer containing a photo-thermal conversion material, the photo-thermal conversion material being a tungsten oxide material, the tungsten oxide material including tungsten oxide powder, _{Wherein the} tungsten oxide material comprises one selected from the group consisting of WO _2.72 , Cs _0.33 WO _3, and combinations thereof,
Wherein an OD value of the substrate layer containing the photo-thermal conversion material is 0.8 to 1.9.
delete delete delete delete The method according to claim 1,
The content of the photo-
Is 10 to 70 parts by weight based on 100 parts by weight of the entire substrate layer-containing material.
delete The method according to claim 1,
Wherein the thickness of the substrate layer containing the photo-thermal conversion material is 50 to 200 占 퐉.
The method according to claim 1,
Wherein an intermediate layer is further formed on the substrate layer containing the photo-thermal conversion material.
10. The method of claim 9,
Wherein the intermediate layer has a thickness of 0.1 to 3 占 퐉.
A base layer containing a photothermal conversion material; And
Wherein the photo-thermal conversion material is a tungsten oxide-based material, and the tungsten oxide-based material is a tungsten oxide-based material, and the photo-thermal conversion material is a tungsten oxide- Wherein the base material comprises tungsten oxide powder and the tungsten oxide material comprises one selected from the group consisting of WO _2.72 , Cs _0.33 WO ₃ and combinations thereof, wherein the OD value of the base layer comprising the photo-thermal conversion material is 0.8 Lt; RTI ID = 0.0 &gt; 1. &lt; / RTI &gt;
delete delete delete delete 12. The method of claim 11,
The content of the photo-
Is 10 to 70 parts by weight based on 100 parts by weight of the entire substrate layer-containing material.
delete 12. The method of claim 11,
Wherein the thickness of the substrate layer containing the photo-thermal conversion material is 50 to 200 占 퐉.
12. The method of claim 11,
And an intermediate layer is further formed on the base layer containing the photo-thermal conversion material.
20. The method of claim 19,
Wherein the intermediate layer has a thickness of 0.1 to 3 占 퐉.

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