1,2-diphenylbenzimidazole-triarylamine hybrided bipolar host materials employing fluorene as bridge for RYB and white electrophosphorescent devices
作者:Ejabul Mondal、Wen-Yi Hung、Ke-Ting Lin、Hsiao-Fan Chen、Ken-Tsung Wong
DOI:10.1016/j.orgel.2016.06.026
日期:2016.10
Tg = 148–162 °C). As a result, these bipolar materials were utilized as universal hosts for red, yellow, and blue (RYB) phosphorescent OLEDs, showing maximum external quantum efficiencies (ηext) of 9.6%, 14.7%, and 18.9% for blue (FIrpic), yellow (m-(Tpm)2Ir(acac) and red [Os(bpftz)2(PPhMe2)2, OS1], respectively. In addition, white organic light-emitting diodes combining a blue emitter (FIrpic) and yellow emitter
合成并表征了四种新颖的双极主体(DTAFNBI,m - DTAFNBI,DTAFCBI和m - DTAFCBI),该主体包括空穴传输的二甲苯基苯基氨基供体和一个通过芴间隔基连接的电子传输的1,2-二苯基苯并咪唑受体。通过苯基苯并咪唑的不同键合拓扑,可以对热,光物理和电化学性质进行微调。饱和芴间隔基以及二甲苯基苯基氨基供体和苯基苯并咪唑受体赋予了较高的三重态能量(E T = 2.47–2.62 eV,记录在20 K下的纯净膜中)和双极传输能力。此外,芴的sp 3-杂化C9给出的四边形几何结构阻碍了分子间堆积,并导致出色的热稳定性和形态稳定性(T d = 379–392°C,相应的重量损失5%;T g = 148–162°C )。其结果是,这些双极性材料用作用于红,黄,蓝(RYB)磷光OLED通用主机,显示出最大外部量子效率(η EXT用于蓝色(的FIrpic)的9.6%,14.7%,和18