Donor substrate for laser induced thermal imaging method and method of fabricating organic light emitting display device using the same

Abstract

A donor substrate for a laser induced thermal imaging method and method of fabricating an organic light emitting display device using the same are provided. A transfer layer for a laser induced thermal imaging method is made of an organic material having a molecular weight of 500 to 70,000 to fabricate an organic light emitting display device having a uniform organic layer pattern. The invention also provides a method of fabricating an organic light emitting display device which may achieve a large-sized pixel region as well as improve the productivity of the organic light emitting display device.

What is claimed is: 
     
         1 . A method of fabricating a donor substrate for a laser induced thermal imaging method, comprising:
 preparing a base layer;   forming a light-to-heat conversion layer on the base layer; and   forming a transfer layer on the light-to-heat conversion layer,   wherein the transfer layer is made of an organic material having a molecular weight of 500 to 70,000.   
     
     
         2 . The method according to  claim 1 , wherein the transfer layer is made of an organic material having a molecular weight of 500 to 40,000. 
     
     
         3 . The method according to  claim 1 , wherein the organic material is dissolved or dispersed in a solvent. 
     
     
         4 . The method according to  claim 1 , wherein the transfer layer is made of a material selected from a group consisting of poly[(9,9-dioctylfluorene-2,7-diyl)], poly[(9,9-dihexylfluorene-2,7-diyl)-co-(anthracene-9,10-diyl)], poly[(9,9-dihexylfluorene-2,7-diyl)-co-(9,9-di-(5-phenyl)-N,N′-diphenyl-4,4′-diyl-1,4-diaminobenzene)] and poly[(9,9-dihexylfluorene-2,7-diyl)-co-(9-ethylcarbazole-2,7-diyl)]. 
     
     
         5 . The method according to  claim 1 , wherein the transfer layer is formed by one selected from a group consisting of a spray coating method, a dip coating method, a gravure coating method, a roll coating method and a spin coating method. 
     
     
         6 . The method according to  claim 1 , wherein the light-to-heat conversion layer is formed by one selected from a group consisting of a vacuum deposition method, an electron beam deposition method and a sputtering method when the light-to-heat conversion layer comprises a metal layer, and formed by one selected from a group consisting of a roll coating method, a gravure coating method, an extrusion method, a spin coating method and a knife coating method when the light-to-heat conversion layer comprises an organic layer. 
     
     
         7 . A method of fabricating an organic light emitting display device (OLED), comprising:
 preparing a substrate;   forming a first electrode on the substrate;   forming an organic layer on the first electrode using a laser induced thermal imaging method, the organic layer having at least an emission layer; and   forming a second electrode on the organic layer,   wherein the organic layer is made of an organic material having a molecular weight of 500 to 70,000.   
     
     
         8 . The method according to  claim 7 , wherein the first electrode is any one of an anode electrode and a cathode electrode. 
     
     
         9 . The method according to  claim 7 , wherein the organic layer further comprises at least one selected from a group consisting of a hole injection layer, a hole transport layer, a hole blocking layer, an electron transport layer and an electron injection layer. 
     
     
         10 . The method according to  claim 7 , wherein the emission layer is made of an organic light emitting material having a molecular weight of 500 to 40,000. 
     
     
         11 . An organic light emitting display device (OLED) comprising:
 a substrate having a first electrode;   an organic layer formed on the substrate and having at least an emission layer; and   a second electrode formed on the organic layer,   wherein the organic layer has an edge roughness of 3 μm or less.   
     
     
         12 . The OLED according to  claim 11 , wherein the organic layer is made of an organic material having a molecular weight of 500 to 70,000. 
     
     
         13 . The OLED according to  claim 12 , wherein the organic layer is made of an organic material having a molecular weight of 500 to 40,000. 
     
     
         14 . The OLED according to  claim 11 , wherein the first electrode is any one of an anode electrode and a cathode electrode. 
     
     
         15 . The OLED according to  claim 11 , wherein the organic layer further comprises at least one selected from a group consisting of a hole injection layer, a hole transport layer, a hole blocking layer, an electron transport layer and an electron injection layer.