Heat transfer film and organic electroluminescent element manufactured using same
The present invention relates to a heat transfer film and an organic electroluminescent element manufactured using the same. More specifically, the present invention relates to: a heat transfer film comprising a base film and an outermost layer formed on the base film, wherein a ratio of an elastic modulus of the outermost layer to an elastic modulus of the base film at 25° C. and relative humidity of 45% is approximately 1 or more; and an organic electroluminescent element manufactured using the same.
1. A thermal transfer film comprising:
a base film; and
a light-to-heat conversion layer formed on the base film,
wherein a ratio of elastic modulus of the light-to-heat conversion layer to elastic modulus of the base film is about 1 or more, at 25° C. and relative humidity 45%.
2. The thermal transfer film according to claim 1 , wherein the base film has an elastic modulus from about 2 GPa to about 9 GPa.
3. The thermal transfer film according to claim 1 , wherein the base film has a surface roughness Rpv from about 100 nm to about 200 nm.
4. The thermal transfer film according to claim 1 , wherein the base film comprises a film formed of at least one of polyesters, polyacrylics, polyepoxys, polyolefins, and polystyrenes.
5. The thermal transfer film according to claim 1 , wherein the light-to-heat conversion layer has an elastic modulus from about 3 GPa to about 10 GPa.
6. The thermal transfer film according to claim 1 , wherein the light-to-heat conversion layer is a cured product of a composition comprising: (A) a light-to-heat converting material; (B) a UV curable resin comprising at least one of polyalkyl (meth)acrylates and epoxy(meth)acrylates; (C) a trifunctional to hexafunctional (meth)acrylate monomer; and (D) an initiator.
7. The thermal transfer film according to claim 6 , wherein the composition comprises: about 1 wt % to about 30 wt % of the (A), about 50 wt % to about 80 wt % of the (B), about 1 wt % to about 25 wt % of the (C), and about 1 wt % to about 20 wt % of the (D), in terms of solid content.
8. The thermal transfer film according to claim 1 , further comprising: an outer layer on the light-to-heat conversion layer.
9. The thermal transfer film according to claim 1 , further comprising an outer layer, wherein the light-to-heat conversion layer is stacked between the base film and the outer layer, and a ratio of elastic modulus of the outer layer to elastic modulus of the base film is about 1 or more at 25° C. and relative humidity 45%.
10. The thermal transfer film according to claim 9 , wherein the base film has an elastic modulus from about 2 GPa to about 9 GPa.
11. The thermal transfer film according to claim 9 , wherein the base film comprises a film formed of at least one of polyesters, polyacrylics, polyepoxys, polyolefins, and polystyrenes.
12. The thermal transfer film according to claim 9 , wherein the outer layer has an elastic modulus from about 3 GPa to about 10 GPa.
13. The thermal transfer film according to claim 9 , wherein the outer layer has a hardness from about 300 Mpa to about 550 Mpa.
14. The thermal transfer film according to claim 9 , wherein the outer layer is a cured product of a composition comprising: (A) a UV curable resin; (B) a polyfunctional (meth)acrylate monomer; (C) a UV curable fluorine based compound; and (D) an initiator.
15. The thermal transfer film according to claim 14 , wherein the UV curable resin comprises at least one of a di- or higher-functional epoxy (meth)acrylate, a mixture of the di- or higher-functional epoxy (meth)acrylate and a di- or higher-functional urethane (meth)acrylate, and a tri- or higher-functional urethane (meth)acrylate.
16. The thermal transfer film according to claim 14 , wherein the UV curable fluorine based compound comprises a compound represented by Formula 1:
(CH 2 ═CR 1 —C(═O)—O—) n R f <Formula 1>
(wherein in Formula 1, n is an integer of 1 or more, R 1 is a hydrogen atom or a C 1 to C 5 linear or branched alkyl group, and R f is a fluoroalkyl group or a fluoroalkylene group).
17. The thermal transfer film according to claim 16 , wherein n is an integer from 2 to 20, and R f has any one structure of (a) to (e) represented by Formula 2:
(wherein in Formula 2, * is bonding site, R f1 is a C 1 to C 10 linear or branched perfluoroalkylene group, and R f2 , R f3 , R f4 , and R f5 are hydrogen, or a C 1 to C 14 linear or branched perfluoroalkyl group).
18. The thermal transfer film according to claim 14 , wherein the composition comprises: about 50 wt % to about 80 wt % of the (A), about 10 wt % to about 40 wt % of the (B), about 1 wt % to about 10 wt % of the (C), and about 1 wt % to about 10 wt % of the (D), in terms of solid content.
19. An organic electroluminescent device prepared using the thermal transfer film according to claim 1 as a donor film.