Thin film material using pentaerythritol acrylate for encapsulation of organic or polymeric light emitting device, and encapsulation method for LED using the same

Abstract

The present invention is directed to a thin film material for encapsulation of organic or polymeric light-emitting electric device having light-emitting layer between cathode and anode, for elongation of lifetime of said device and for providing said device with flexibility, more specifically, to a thin film material for encapsulation of organic or polymeric light-emitting electric device comprising polymer having, as repeating unit of backbone, homo-, 2-component co-, ter-, or tetra-polymer of one to four pentaerythritol acrylate monomer, or physically mixed polymer blend of said polymer and polymers other than poly(pentaerythrithol acrylate). Moreover, the present invention is directed to a method for encapsulation of organic or polymeric light-emitting device using said thin film material consisting of wet and dry process. The light-emitting device encapsulated according to the present invention can be bended and can be used in the manufacturing of large surface area display.

1 - 6 . (canceled)  
     
     
         7 . A encapsulation method for an organic or polymeric light emitting device, comprising following steps: (a) preparing a mixture of one to four pentaerythrithol acrylate monomer represented by the following formula I or II and polymerization initiator, by mixing:  
       
         
           
           
               
               
           
         
       
       wherein: 
 R1, R2, R3. R4. and R5. are and R6 are  
                     
 R1, R2, R3, R4 and R5, are  
                     
 and R6 is —CH2OH; R1, R2, R3 and R4 are  
                     
 R5, and R6 are —CH2OH; or R1, and R2 are  
                     
 R3, R4, R5, and R6 are —CH2OH:  
                     
 wherein:  
 at least one of R7, R8, R9, and R10 is  
                     
 and the remainings are —CH2OH;  
 (b) coating said mixture on the surface of the organic or polymeric light emitting device by spin coating process, bar coating process, spreading process or simple immersion process; and,  
 (c) polymerizing said monomer.  
 
     
     
         8 . The encapsulation method for an organic or polymeric light emitting device as claimed in  claim 7 , characterized in that said mixture further comprises polymers other than poly(pentaerythrithol acrylate).  
     
     
         9 . The encapsulation method for an organic or polymeric light emitting device as claimed in claim  5 , characterized in that said mixture further comprises at least on moisture absorbent selected from the group consisting of silica gel, zeolite, magnesium and alkali metal.  
     
     
         10 . The encapsulation method for an organic or polymeric light emitting device as claimed in claim  6 , characterized in that said mixture further comprises at least on moisture absorbent selected from the group consisting of silica gel, zeolite, magnesium and alkali metal.  
     
     
         11 . A encapsulation method for an organic or polymeric light emitting device, comprising the steps: (a) preparing a mixture of one to four pentaerythrithol acrylate monomer represented by the following formula I or II and polymerization initiator, by mixing:  
       
         
           
           
               
               
           
         
       
       wherein: 
 R1, R2, R3, R4, and R5 are and R6 are  
                     
 R1, R2, R3, R4 and R5, are  
                     
 and R6 is —CH2OH; R1, R2, R3 and R4 are  
                     
 R5, and R6 are —CH2OH; or R1, and R2 are  
                     
 R3, R4, R5, and R6 are —CH2OH:  
                     
 wherein: at least one of R7, R8, R9, and R10 is  
                     
 and the remainings are —CH2OH;  
 (b) coating said mixture on the surface of the organic or polymeric light emitting device by physical vapor deposition method or chemical vapor deposition method; and,  
 (c) polymerizing said monomer.  
 
     
     
         12 . The encapsulation method for an organic or polymeric light emitting device as claimed in  claim 11 , characterized in that said mixture further comprises polymers other than poly(pentaerythrithol acrylate).