Organic electroluminescent materials and devices

Abstract

Provided is a new composition of matter for boron containing organic molecules which can be used as hosts or emitters in OLED devices. The compound can have a structure of Formula I

What is claimed is: 
     
         1 . A compound of Formula I 
       
         
           
           
               
               
           
         
       
       wherein:
 ring A and ring B are each independently a 5-membered or 6-membered carbocyclic or heterocyclic ring; 
 X 1 -X 5  are each independently C or N with at least one of X 1  or X 2  being N; 
 Y 1  and Y 2  are each independently selected from the group consisting of O, S, Se, BR, NR, PR, CRR′, SiRR′, GeRR′; 
 R A , R B , and R C  each independently represents zero, mono, or up to a maximum number of allowed substitutions to its associated ring; and 
 R, R′, R A , R B , and R C  are each independently a hydrogen or a substituent selected from the group consisting of deuterium, halogen, alkyl, cycloalkyl, heteroalkyl, heterocycloalkyl, arylalkyl, alkoxy, aryloxy, amino, silyl, boryl, alkenyl, cycloalkenyl, heteroalkenyl, alkynyl, aryl, heteroaryl, acyl, carboxylic acid, ether, ester, nitrile, isonitrile, sulfanyl, sulfinyl, sulfonyl, phosphino, and combinations thereof; and two substituents can be joined or fused to form a ring.