Constructing multifunctional deep-blue emitters with weak charge transfer excited state for high-performance non-doped blue OLEDs and single-emissive-layer hybrid white OLEDs  

作　　者：Hui Liu Xiangyang Tang Zhuang Cheng Yin Hu Yan Yan Yangze Xu Zihan Su Futong Liu Ping Lu 

机构地区：[1]State Key Laboratory of Supramolecular Structure and Materials Department of Chemistry,Jilin University,Changchun 130012,China [2]Sichuan Province Key Laboratory of Information Materials and Devices Application,College of Optoelectronic Engineering,Chengdu University of Information Technology,Chengdu 610225,China

出　　处：《Chinese Chemical Letters》2024年第10期175-179,共5页中国化学快报（英文版）

基　　金：financial support from National Natural Science Foundation of China(No.22075100);the Jilin Provincial Science and Technology Department(No.20220201082GX);the China Postdoctoral Science Foundation(Nos.2022TQ0111,2023M731267);Sichuan Science and Technology Program(No.2023NSFSC0985);Scientific Research Foundation of Chengdu University of Information Technology(No.KYTZ202174)and the Changsha Automobile Innovation Research Institute。

摘　　要：Deep-blue emitter with high photoluminescence efficiency(PLQY)is highly desirable in ultra-high definition displays and white solid-state lightings.In this work,two deep-blue phenanthro[9,10]imidazole derivatives,PPIS and PPPIS,with hot exciton property are successfully developed.Compared to PPIS,the embedded phenyl bridge in PPPIS is able to effectively increase the overlap of frontier molecular orbitals.In consequence,PPPIS shows higher oscillator strength and significantly enhanced PLQY.PPPIS also achieves better electroluminescence performance in non-doped device,showing deep-blue emission with Commission International de l’Eclairage(CIE)coordinates of(0.153,0.087)and the maximum external quantum efficiency(EQEmax)of 8.5%with minuscule efficiency roll-off.Meanwhile,when PPPIS serves as the host for phosphor PO-01,high-efficiency orange phosphorescent device is obtained with high EQEmax of 29.8%and negligible efficiency roll-off at 1000 cd/m^(2).Further,efficient single-emissive-layer white device is assembled via utilizing PPPIS as a blue emitter as well as the host for PO-01 simultaneously,providing warm-white emission with CIE coordinates of(0.429,0.433)at 1000 cd/m^(2),the forward-viewing EQEmaxof 27.2%and maximum power efficiency(PEmax)of 80.1 lm/W,respectively.Our studies can establish a viable design strategy for deep-blue emitters in high-performance non-doped blue OLEDs and hybrid WOLEDs.

关 键 词：Deep-blue emitters Phenanthro[9 10]imidazole Hot exciton Host Single-emissive-layer white device 

分 类 号：O641.1[理学—物理化学] TN383.1[理学—化学]