具有电子传输特性的Be金属配合物作为磷光主体材料的电致发光性能

采用具有优良电子传输特性的铍金属配合物二合铍(Ⅱ)(Bempp)作为磷光客体材料二(2-苯基吡啶)(N,N'-二异丙基苯甲脒)合铱(Ⅲ)(PPP)的主体材料制备磷光电致发光器件. 与经典的空穴传输型主体材料4,4'-二(N-咔唑)联苯(CBP)相比, Bempp更有利于空穴、 电子的注入及传输的平衡, 与PPP间存在更高效的能量转移. 该器件的各项性能指标, 包括最大效率和流明效率(63.1 cd/A和54.0 lm/W), 均明显高于采用CBP作为主体材料的磷光器件.

Electroluminescent Property of a Beryllium Metal-chelate Complex Used as the Electron-transporting Host Material

A simple and highly efficient single-emitting-layer phosphorescent organic light-emitting diode(PHOLED) that used bis2-(2-hydroxyphenyl)-4-methyl-pyridine] beryllium(Bempp) as the electron-transporting host material and bis(pyridylphenyl) iridium(Ⅲ)(N,N′-diisopropyl-benzamidine)(PPP) as the phosphorescent dye to enhance the electro-luminescence(EL) performance was presented.This PHOLED device exhibited substantially lower driving voltage(2.5 V) and higher EL efficiencies than those based on the CBP host.It showed dramatically enhanced peak values of more than 63.1 cd/A for luminous efficiency,54.0 lm/W for power efficiency.The high EL performance was attributed to the well-matched energy levels of Bempp with the hole/electron-transporting(HT/ET) materials as well as the highly efficient and complete energy transfer between the host and the guest.The results demonstrate that Bempp is a promising host material to replace the commonly used CBP because of its higher EL efficiency and its relative high triplet energy(ca.2.6 eV).