Organic electroluminescent element sealing composition and organic light-emitting device

Abstract

This organic electroluminescent element sealing composition contains an addition reaction curing type silicone composition which is liquid at normal temperature and has a curing temperature of 100 degrees C. or below and a moisture content of 400 ppm or less. The addition reaction curing type silicone composition contains (A) polyorganosiloxane having an average of 0.2 to 5 alkenyl groups bonded to silicon atoms in one molecule, (B) polyorganohydrogensiloxane having at least two or more hydrogen atoms bonded to silicon atoms in one molecule, and (C) a platinum-based catalyst. The organic electroluminescent element sealing composition can prevent deterioration of the organic electroluminescent element and can provide the organic light-emitting device having a good light-emitting property for a long period.

What is claimed is: 
     
         1 . A sealing composition, comprising
 an addition reaction curing type silicone composition in liquid form at normal temperature,
 the addition reaction curing type silicone composition having a curing temperature of 100° C. or below and a moisture content of 400 ppm or less, 
 the addition reaction curing type silicone composition comprising: 
 (A) polyorganosiloxane having an average of 0.5 or more alkenyl group bonded to silicon atom in one molecule; 
 (B) polyorganohydrogensiloxane having 2 or more hydrogen atoms bonded to silicon atoms in one molecule; and 
 (C) a platinum-based catalyst. 
   
     
     
         2 . The sealing composition according to  claim 1 ,
 wherein the polyorganohydrogensiloxane comprises 0.2 to 5.0 times of the hydrogen atoms bonded to the silicon atoms as many as alkenyl group of the polyorganosiloxane.   
     
     
         3 . An organic light-emitting device, comprising:
 a first substrate;   an organic electroluminescent element disposed on a surface of the first substrate;   a second substrate disposed on the surface of the first substrate to face the organic electroluminescent element; and   a sealing layer filled between the first substrate and the second substrate to seal the organic electroluminescent element, the sealing layer being made of a cured material of the sealing composition according to  claim 1 .   
     
     
         4 . The organic light-emitting device according to  claim 3 , further comprising
 a barrier layer configured to block oxygen and moisture between the sealing layer and the organic electroluminescent element.   
     
     
         5 . An addition reaction curing type silicone composition in liquid form at normal temperature, comprising:
 (A) polyorganosiloxane having an average of 0.5 or more alkenyl group bonded to silicon atom in one molecule;   (B) polyorganohydrogensiloxane having 2 or more hydrogen atoms bonded to silicon atoms in one molecule; and   (C) a platinum-based catalyst,   wherein the addition reaction curing type silicone has a curing temperature of 100° C. or below and a moisture content of 400 ppm or less.