Efficient deep blue OLEDs with extremely low efficiency roll-off at high brightness based on phenanthroimidazole derivatives

作     者：Xiang Chen Jue-Wen Zhao Xu-Hui Zheng Jie-Ji Zhu Guo-Xi Yang Shan-Shun Tang Qing-Xiao Tong Si-Lu Tao 

作者机构：Department of Chemistry and Key Laboratory for Preparation and Application of Ordered Structural Material of Guangdong ProvinceShantou UniversityGuangdong 515063China School of Optoelectronic Science and EngineeringUniversity of Electronic Science and Technology of China(UESTC)Chengdu 610054China 

出 版 物：《Chinese Chemical Letters》 (中国化学快报（英文版）)

年 卷 期：2019年第30卷第11期

页      面：1989-1993页

核心收录：

学科分类：080903[工学-微电子学与固体电子学] 0809[工学-电子科学与技术（可授工学、理学学位）] 08[工学] 080501[工学-材料物理与化学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 0703[理学-化学] 

基　　金：supported by the National Natural Science Foundation of China(No.51673113) the Key Project of DEGP(No.2018KZDXM032) 

主　　题：OLED Deep blue Phenanthroimidazole Low efficiency roll-off Fragment contribution analysis 

摘      要：Phosphorescent and thermally activated delayed fluorescence(TADF)emitters can break through the spin statistics rules and achieve great success in external quantum efficiency(over 5%).However,maintaining high efficiency at high brightness is a tremendous challenge for applications of organic light emitting ***,we reported two phenanthroimidazole derivatives PPI-An-CN and PPI-An-TP and achieved extremely low efficiency roll-off with about 99%of the maximum external quantum efficiency(EQEmax)maintained even at a high luminance of 1000 cd/cm2 based non-doped *** doping the two materials in CBP(4,4 -bis(N-carbazolyl)-1,1 -biphenyl),the doped devices still exhibited excellent stability at high brightness with CIEy≈0.07 and low turn-on voltage of only 2.8 *** state-ofthe-art low efficiency roll-off makes the new materials attractive for potential *** is the first time that the Fragment Contribution Analysis method has been used to analyze the excited state properties of the molecules in the field of OLEDs,which helps us understand the mechanism more intuitively and deeply.