Carbazole-endcapped Spiro[fluorene-9,9′-xanthene] with Large Steric Hindrance as Hole-transporting Host for Heavily-doped and High Performance OLEDs
作者:Xianghua Zhao、Yukun Wu、Nannan Shi、Xiaoyu Li、Yi Zhao、Mingli Sun、Dongxue Ding、Hui Xu、Linghai Xie
DOI:10.1002/cjoc.201500252
日期:2015.8
compound functionalized spiro[fluorene‐9,9′‐xanthene] with carbazole group (2‐carbazolyl‐spiro[fluorene‐9,9′‐xanthene], SFX‐Cz) via Friedel‐Crafts and Ullmann reaction, which is expected to own high thermal and morphological stability, and good carrier injection/transporting properties due to the excellent hole transporting characteristics of carbazole and cruciform structure of spiro[fluorene‐9,9′‐xanthene]
在这项工作中,我们通过Friedel设计并合成了带有咔唑基团的新型螺环化合物官能化的螺[芴-9,9'-x吨](2-咔唑基-螺[芴-9,9'-x吨],SFX-Cz)。 ‐Crafts和Ullmann反应,由于咔唑具有出色的空穴传输特性和螺[芴-9,9'-an吨]的十字形结构,因此有望具有较高的热稳定性和形态稳定性,并具有良好的载流子注入/传输性质。咔唑封端的螺[芴-9,9'-x吨] SFX-Cz通过改变掺杂剂浓度研究了基于FIrpic作为荧光粉发射器的PhOLED,它们的最大EQE分别为8.9%,7.4%,9.1%和4.7%,而掺杂从10%增至50%。更高性能的PhOLED不受浓度从10%到30%的变化的影响,这表明SFX-Cz的庞大空间位阻可能是采用简化工艺的高性能和廉价设备的潜在候选人。