Spirobifluorene Core-Based Novel Hole Transporting Materials for Red Phosphorescence OLEDs
作者:Ramanaskanda Braveenth、Hyeong Bae、Quynh Nguyen、Haye Ko、Choong Lee、Hyeong Kim、Jang Kwon、Kyu Chai
DOI:10.3390/molecules22030464
日期:——
Two new hole transporting materials, named HTM 1A and HTM 1B, were designed and synthesized in significant yields using the well-known Buchwald Hartwig and Suzuki cross- coupling reactions. Both materials showed higher decomposition temperatures (over 450 °C) at 5% weight reduction and HTM 1B exhibited a higher glass transition temperature of 180 °C. Red phosphorescence-based OLED devices were fabricated to analyze the device performances compared to Spiro-NPB and NPB as reference hole transporting materials. Devices consist of hole transporting material as HTM 1B showed better maximum current and power efficiencies of 16.16 cd/A and 11.17 lm/W, at the same time it revealed an improved external quantum efficiency of 13.64%. This efficiency is considerably higher than that of Spiro-NPB and NPB-based reference devices.
设计和合成了两种新的孔导材料,命名为HTM 1A和HTM 1B,使用著名的Buchwald-Hartwig和Suzuki交叉偶联反应,获得了显著的产率。这两种材料在5%重量减少时显示出较高的分解温度(超过450°C),并且HTM 1B表现出较高的玻璃转变温度为180°C。制作了基于红色磷光的OLED器件,以分析其性能,并将其与作为参考孔导材料的Spiro-NPB和NPB进行比较。包含孔导材料HTM 1B的器件显示出更好的最大电流和功率效率,分别为16.16 cd/A和11.17 lm/W,同时显示出改进的外部量子效率为13.64%。这一效率显著高于基于Spiro-NPB和NPB的参考器件。