Organic electroluminescent materials and devices
A compound of Formula IwhereinZ1, Z2, Z3, and Z4 are independently selected from C or N; wherein one of Z1 or Z3 is N and the other is C, and one of Z2 or Z4 is N and the other is C; andif Z3 and Z4 are N, then one of RB and one of RC is selected from the group consisting of aryl, substituted aryl,...
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