ORGANIC ELECTROLUMINESCENT MATERIALS AND DEVICES

摘要

A new class of compounds containing aza-dibenzothiophene or aza-dibenzofuran are provided. The compounds may be used in organic light emitting devices giving improved stability, improved efficiency, long lifetime and low operational voltage. In particular, the compounds may be used as the host material of an emissive layer having a host and an emissive dopant, or as a material in an enhancement layer.

主权项

1. A compound having the formula: wherein m and n are 0, 1, 2, 3, or 4; wherein X1, X2, X3, X4, X5, X6, X7, and X8 are independently selected from the group consisting of a carbon atom and a nitrogen atom; wherein at least one of X1, X2, X3, X4, X5, 6, X7, and X8 is a nitrogen atom; wherein Y is S or O; wherein R1 and R2 may represent mono, di, tri, or tetra substitutions; wherein R1 and R2 are independently selected from the group consisting of hydrogen, alkyl, aryl and halide; and wherein at least one of R1 and R2 is selected from the group consisting of: wherein R′1, R′2, R′3, and R′4 may represent mono, di, tri, tetra or penta substitutions: and wherein R′1 R′2, R′3, and R′4 are independently selected from the group consisting of hydrogen, alkyl, heteroalkyl, aryl and heteroaryl.