A pure blue emitter (CIEy ≈ 0.08) of chrysene derivative with high thermal stability for OLED

Abstract

A chrysene derivative, BPCC (6,12-bis(9-phenyl-9H-carbazol-3-yl)chrysene), possessing high thermal stability with a high glass transition temperature (T_g = 181 °C) was synthesized. Carbazole groups were introduced to improve its hole transporting properties and suppress crystallization. The device using BPCC as the emitter shows pure saturated blue emission color with coordinates of (0.16, 0.08). Furthermore, utilizing transporting materials with high triplet energy, e.g., TAPC (1,1-bis[4-[N,N-di(p-tolyl)aminophenyl]cyclohexane) and TemPPB (1,2,4,5-tetra(3-pyrid-3-yl-phenyl)benzene) as the hole transport layer (HTL) and electron transport layer (ETL), respectively, the maximum external quantum efficiency (EQE) is 4.9%. It shows a great potential as a highly efficient pure blue emitter for organic light-emitting devices (OLEDs).