Compounds for use in opto-electrical devices

Abstract

A composition for use in fabricating opto-electrical devices comprising a solution processable triazine host material and a phosphorescent moiety.

1 . A composition for use in fabricating opto-electrical devices comprising a solution processable triazine host material and a phosphorescent moiety, wherein the triazine host material is an aryl triazine with at least one aryl group having at least one solubilizing substituent bonded thereto. 
     
     
         2 . A composition according to  claim 1  wherein the triazine host material is a small molecule triazine compound. 
     
     
         3 . A composition according to  claim 1  wherein the solution processable triazine host material is a polymer comprising a triazine repeat unit. 
     
     
         4 . A composition according to  claim 1 , wherein the triazine comprises a C4-C20 alkyl chain solubilising substituent. 
     
     
         5 . A composition according to  claim 1 , wherein the aryl group is directly bonded to the central triazine ring via a carbon atom. 
     
     
         6 . A composition according to  claim 5 , wherein the aryl group is a phenyl ring. 
     
     
         7 . A composition according to  claim 1 , wherein the triazine compound is a tris-aryl triazine with at least one of the aryl groups having the at least one solubilizing substituent bonded thereto. 
     
     
         8 . A composition according to  claim 7 , wherein two or three of the aryl groups have solubilizing substituents bonded thereto. 
     
     
         9 . A composition according to  claim 1 , having the formula: 
       
         
           
           
               
               
           
         
         where the R groups are solubilizing substituents which may be the same or different. 
       
     
     
         10 . A composition according to  claim 9 , having one of the following formulas: 
       
         
           
           
               
               
           
         
       
     
     
         11 . A composition according to  claim 1 , wherein the at least one solubilizing substituent comprises an amine group which is not directly bonded to the central triazine ring via a nitrogen atom. 
     
     
         12 . A composition according to  claim 3 , wherein the triazine repeat unit is provided in a copolymer with a second repeat unit. 
     
     
         13 . A composition according to  claim 12 , wherein the second repeat unit is a twisted co-monomer. 
     
     
         14 . A composition according to  claim 1 , wherein the phosphorescent moiety is provided as a separate chemical entity to the solution processable triazine host material and is blended with the solution processable triazine host material. 
     
     
         15 . A composition according to  claim 1 , wherein the phosphorescent moiety is chemically bound to the solution processable triazine host material. 
     
     
         16 . A composition according to  claim 15 , wherein the phosphorescent moiety is provided in the polymer backbone or in a pendent side chain. 
     
     
         17 . A composition according to  claim 1 , wherein the phosphorescent moiety is a green emitter. 
     
     
         18 . A method of fabricating an opto-electrical device, the method comprising the steps:
 depositing from solution, on a substrate comprising a first electrode for injecting charge carriers of a first polarity, a composition according to  claim 1 ; and   depositing thereover a second electrode for injecting charge carriers of a second polarity opposite to the first polarity.   
     
     
         19 . An opto-electrical device comprising:
 a substrate; a first electrode disposed over the substrate for injecting charge carriers of a first polarity;   a layer disposed over the first electrode comprising a composition according to  claim 1 ; and   a second electrode disposed thereover for injecting charge carriers of a second polarity opposite to the first polarity.