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. 
   
   
       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 host material comprises at least one C 4 -C 20  alkyl chain solubilizing substituent. 
   
   
       5 . A composition according to  claim 1 , wherein the triazine host material comprises a central triazine ring substituted with at least one aryl group. 
   
   
       6 . A composition according to  claim 5 , wherein the aryl group is directly bonded to the central triazine ring. 
   
   
       7 . A composition according to  claim 6 , wherein the aryl group is directly bonded to the central triazine ring via a carbon atom. 
   
   
       8 . A composition according to  claim 7 , wherein the aryl group is a phenyl ring. 
   
   
       9 . A composition according to  claim 4 , wherein the triazine host material is a tris-aryl triazine compound with at least one of the aryl groups having the at least one solubilizing substituent bonded thereto. 
   
   
       10 . A composition according to  claim 9 , wherein two or three of the aryl groups have solubilizing substituents bonded thereto. 
   
   
       11 . A composition according to  claim 1 , wherein the triazine host material has the formula: 
     
       
         
         
             
             
         
       
       where the R groups are solubilizing substituents which may be the same or different. 
     
   
   
       12 . A composition according to  claim 11 , wherein the triazine host material has one of the following formulas: 
     
       
         
         
             
             
         
       
     
   
   
       13 . A composition according to  claim 4 , 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. 
   
   
       14 . A composition according to  claim 3 , wherein the triazine repeat unit is provided in a copolymer with a second repeat unit. 
   
   
       15 . A composition according to  claim 14 , wherein the second repeat unit is a twisted co-monomer. 
   
   
       16 . 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. 
   
   
       17 . A composition according to  claim 1 , wherein the phosphorescent moiety is chemically bound to the solution processable triazine host material. 
   
   
       18 . A composition according to  claim 17 , wherein the phosphorescent moiety is provided in the polymer backbone or in a pendent side chain. 
   
   
       19 . A composition according to  claim 1 , wherein the phosphorescent moiety is a green emitter. 
   
   
       20 . A method of fabricating an opto-electrical device, the method comprising: 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. 
   
   
       21 . 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.