Donor substrate for laser transfer and organic electroluminescence display device manufactured using the same
View Patent ↗A donor substrate for laser transfer comprises: a base film; a light-to-heat conversion layer formed on the base film; and a transfer layer formed of an organic material on the light-to-heat conversion layer. The transfer layer contains a thermosetting electroluminescent material, and an organic electroluminescence display device is manufactured using the same. Thus, R, G and B emission layers are simply formed with a fine pattern by a thermal curing process after laser transfer. As a result, the emission layers are not damaged, and the manufacturing cost of a full-color organic electroluminescence display device is reduced due to employment of a simplified mask process. The donor substrate is advantageous to use in the manufacture of a large-sized organic electroluminescence display device.
1. A donor substrate for laser transfer, comprising:
a base film;
a light-to-heat conversion layer formed on the base film; and
a transfer layer formed on the light-to-heat conversion layer, wherein the transfer layer contains a thermosetting electroluminescent material;
wherein the thermosetting electroluminescent material comprises a composition which is used as a thermosetting electroluminescent material; and
wherein the composition included in the thermosetting electroluminescent material comprises a blend of thermosetting non-emission small molecules and an electroluminescent polymer having no thermosetting functional group, and wherein the electroluminescent polymer is contained in the transfer layer to an extent of about 10% to 70%.
2. The donor substrate according to claim 1 , wherein the thermosetting non-emission small molecules comprise one of a benzocyclobutene-based small molecule and dicyclopentadienone derivatives-diacethylene derivatives.
3. The donor substrate according to claim 1 , wherein the transfer layer is formed on the light-to-heat conversion layer by a wet process.
4. An organic electroluminescence display device manufactured using the donor substrate for laser transfer as recited in claim 1 .
5. A method for manufacturing a full-color organic electroluminescence display device, comprising the steps of:
providing a substrate;
patterning and forming a first electrode layer on the substrate;
forming an insulating layer on the first electrode layer so as to define first, second and third pixel regions;
positioning a donor substrate containing a thermosetting material on the first pixel region, and transferring a first electroluminescent material using a laser;
positioning a donor substrate containing a thermosetting material on the second pixel region, and transferring a second electroluminescent material using the laser;
positioning a donor substrate containing a thermosetting material on the third pixel region, and transferring a third electroluminescent material using the laser;
thermally curing the first, second and third electroluminescent materials to form first, second and third emission layers, respectively, in the first, second and third pixel regions, respectively; and
forming a second electrode on the first, second and third emission layers over an entire surface of the substrate;
wherein the thermosetting electroluminescent material comprises a composition which includes a blend of thermosetting non-emission small molecules and an electroluminescent polymer having no thermosetting functional group, and wherein the electroluminescent polymer is contained in the transfer layer to an extent of about 10% to 70%.
6. The method according to claim 5 , wherein each of the first, second and third electroluminescent materials has a different respective color and has one of red, green and blue colors.
7. The method according to claim 5 , wherein each of the steps of transferring the first electroluminescent material, transferring the second electroluminescent material, and transferring the third electroluminescent material is performed in one of a vacuum and an inert atmosphere.
8. The method according to claim 5 , wherein the thermosetting non-emission small molecules comprise one of a benzocyclobutene-based small molecule and dicyclopentadienone derivatives-diacethylene derivatives.
9. The method according to claim 5 , wherein the thermosetting electroluminescent material ha a degree of cure of at least 60% when cured for one hour at a temperature in a range of 50° C. to 350° C.
10. A method of manufacturing a donor substrate for laser transfer, comprising the steps of:
providing a base film;
forming a light-to-heat conversion layer on the base film;
forming a transfer layer on the light-to-heat conversion layer, wherein the transfer layer contains a thermosetting electroluminescent material; and
curing the thermosetting electroluminescent material for one hour at a temperature in a range of 50° C. to 350° C. so that the thermosetting electroluminescent material has a degree of cure of at least 60%.
11. A donor substrate for laser transfer manufactured by the method of claim 10 .
12. An organic electroluminescent display device manufactured using a donor substrate for laser transfer manufactured by the method of claim 10 .