HIGH GLASS TRANSITION TEMPERATURE MEDIUM-SIZED AMBIPOLAR HOST MATERIALS

摘要

Disclosed herein are am bipolar host compounds represented by formula (I), wherein: a) R4 is an optionally substituted aryl or an optionally substituted heteroaryl group; b) n is at least 2; e) for each (ii) at least one of R1, R2 and R3 is independently an optionally substituted carbazole group, and the remaining of R1, R2 and R3 are independently selected from hydrogen, halogen and a C1-20 organic group: and d ) Y is selected from (III), wherein R5 is an.optionally substituted aryl group, an optionally substituted heteroaryl group, an optionally substituted alkyl group or an optionally substituted heteroalkyl group, and wherein R6 is hydrogen,, an optionally substituted aryl group, an optionally substituted heteroaryl group, an optionally substituted alkyl -group or an optionally substituted heteroalky! group. The compounds can be used in OLED devices and are ambipolar. The OLED devices can show high efficiency and high luminance.