Theoretical maximum quantum efficiency in red phosphorescent organic light-emitting diodes at a low doping concentration using a spirobenzofluorene type triplet host material
摘要:
Red phosphorescent organic light-emitting diodes (PHOLEDs) with a 100% internal quantum efficiency at a low doping concentration were fabricated using a spirobenzofluorene type phosphine oxide as the host material. A spirobenzofluorene type phosphine oxide compound, 2,7-bis(diphenylphosphoryl)spiro[fluorene-7,11'-benzofluorene] (SPPO21), was synthesized as the electron transport type host material for the red phosphorescent organic light-emitting diodes. The device performances of the SPPO21 based red PHOLEDs were optimized at a low doping concentration of 1-2% because of energy transfer, little concentration quenching and charge trapping. A high external quantum efficiency of 20% was achieved for the red PHOLEDs with the SPPO21 host. (C) 2010 Elsevier B. V. All rights reserved.
已经开发了常规的邻卤代二芳基和一锅串联方案以合成含萘和pyr的螺芴。使用Suzuki交叉偶联反应安装两个pyr取代基,以产生一系列螺芴官能化的多环芳烃衍生物DPSBFF,DPSIPF,DPSDBXF和DPSFX。基于DPSFX:PVK共混物的初步旋涂设备显示出4.3 V的低启动电压和深蓝光发射,电流效率为1.1 cd / A。