Donor film for laser induced thermal imaging method, light emitting device using the same, and method of manufacturing light emitting device

Abstract

A donor film for a laser induced thermal imaging method capable of improving the optical efficiency of an emission layer, a light emitting device using the same, and a method of manufacturing the light emitting device are provided. The donor film for a laser induced thermal imaging method includes a base substrate, a light to heat conversion layer (LTHC) provided on the base substrate and having a pattern with a predetermined step difference, and a transfer layer provided on the LTHC. It is possible to improve the optical efficiency of the emission layer by patterning the transfer layer using the LTHC having the pattern with a predetermined step difference.

1 . A donor film for a laser induced thermal imaging method comprising: 
 a base substrate;    a light to heat conversion layer provided on said base substrate and comprising a pattern with a predetermined step difference; and    a transfer layer provided on said light to heat conversion layer.    
     
     
         2 . The donor film as claimed in  claim 1 , wherein said pattern is a concavo-convex pattern or an embossed pattern.  
     
     
         3 . The donor film as claimed in  claim 2 , wherein said transfer layer includes a transcription pattern corresponding to the pattern formed in the light to heat conversion layer in the form of a film.  
     
     
         4 . The donor film as claimed in  claim 3 , wherein, when laser is radiated onto said base substrate, protruding parts of said transcription pattern are first transcribed.  
     
     
         5 . The donor film as claimed in  claim 1 , wherein said transfer layer comprises active layer comprising at least one among an emission layer, a hole injecting layer, a hole transporting layer, an electron transporting layer, and an electron injecting layer.  
     
     
         6 . The donor film as claimed in  claim 5 , wherein said active layer is formed of an organic material or an inorganic material.  
     
     
         7 . The donor film as claimed in  claim 5 , wherein said transfer layer is said hole injecting layer or said electron transporting layer.  
     
     
         8 . The donor film as claimed in  claim 1 , further comprising a buffer layer interposed between said light to heat conversion layer and said transfer layer.  
     
     
         9 . A method of manufacturing a light emitting device, the method comprising the steps of: 
 providing an acceptor substrate;    providing a donor film separated from said acceptor substrate by a predetermined distance and comprising a light to heat conversion layer including a pattern with a predetermined step difference on a base substrate and a transfer layer provided on said light to heat conversion layer and including a transcription pattern corresponding to the pattern;    arranging said donor film so that said transfer layer faces the surface of said acceptor substrate; and    radiating laser onto said donor film to transcribe the transfer layer onto said acceptor substrate.    
     
     
         10 . The method as claimed in  claim 9 , before forming said transfer layer, further comprising forming a first electrode on the acceptor substrate.  
     
     
         11 . The method as claimed in  claim 10 , further comprising: 
 forming an active layer on said first electrode; and    forming a second electrode on said active layer.    
     
     
         12 . The method as claimed in  claim 9 , after forming said transfer layer on the acceptor substrate, further comprising forming a first electrode on said transfer layer.  
     
     
         13 . The method as claimed in  claim 12 , further comprising: 
 forming an active layer on said first electrode; and    forming a second electrode on said active layer.    
     
     
         14 . The method as claimed in  claim 9 , wherein, in the step of transcribing said transfer layer, when the laser is radiated onto said donor film, protruding parts of said transfer layer are first transcribed.  
     
     
         15 . The method as claimed in  claim 15 , wherein said pattern is a concavo-convex pattern or an embossed pattern.  
     
     
         16 . A light emitting device comprising: 
 at least one first electrode formed on an acceptor substrate;    at least one active layer formed on said first electrode and including a pattern with a predetermined step difference; and    a second electrode formed on said active layer.    
     
     
         17 . The light emitting device as claimed in  claim 16 , wherein said active layer is in the form of a film and is transcribed onto said first electrode by laser radiation.  
     
     
         18 . The light emitting device as claimed in  claim 17 , wherein said pattern is a concavo-convex pattern or an embossed pattern.  
     
     
         19 . The light emitting device as claimed in  claim 18 , wherein said active layer comprises at least one among a emission layer, a hole injecting layer, a hole transporting layer, an electron transporting layer, and an electron injecting layer.  
     
     
         20 . The light emitting device as claimed in  claim 19 , wherein said active layer is formed of an organic material or an inorganic material.