Single-crystalline hole-transporting layers for efficient and stable organic light-emitting devices  

作　　者：Gao-Da Ye Ran Ding Su-Heng Li Lei Ni Shu-Ting Dai Nian-Ke Chen Yue-Feng Liu Runda Guo Lei Wang Xian-Bin Li Bin Xu Jing Feng 

机构地区：[1]State Key Laboratory of Integrated Optoelectronics,College of Electronic Science and Engineering,Jilin University,2699 Qianjin Street,130012 Changchun,China. [2]State Key Laboratory of Supermolecular Structures and Materials,The Institute of Theoretical Chemistry,Jilin University,2699 Qianjin Street,130012 Changchun,China. [3]Wuhan National Laboratory for Optoelectronics,Huazhong University of Science and Technology,430074 Wuhan,China

出　　处：《Light(Science & Applications)》2024年第7期1341-1353,共13页光（科学与应用)（英文版）

基　　金：the National Key Research and Development Program of China(Grant Nos.2022YFB3607500 and 2020YFA0715000);Natural Science Foundation of China(Grant Nos.62274076 and 61825402)。

摘　　要：Efficient charge-carrier injection and transport in organic light-emitting devices(OLEDs)are essential to simultaneously achieving their high efficiency and long-term stability.However,the charge-transporting layers(CTLs)deposited by various vapor or solution processes are usually in amorphous forms,and their low charge-carrier mobilities,defectinduced high trap densities and inhomogeneous thickness with rough surface morphologies have been obstacles towards high-performance devices.Here,organic single-crystalline(SC)films were employed as the hole-transporting layers(HTLs)instead of the conventional amorphous films to fabricate highly efficient and stable OLEDs.The highmobility and ultrasmooth morphology of the SC-HTLs facilitate superior interfacial characteristics of both HTL/electrode and HTL/emissive layer interfaces,resulting in a high Haacke’s figure of merit(FoM)of the ultrathin top electrode and low series-resistance joule-heat loss ratio of the SC-OLEDs.Moreover,the thick and compact SC-HTL can function as a barrier layer against moisture and oxygen permeation.As a result,the SC-OLEDs show much improved efficiency and stability compared to the OLEDs based on amorphous or polycrystalline HTLs,suggesting a new strategy to developing advanced OLEDs with high efficiency and high stability.

关 键 词：CRYSTALLINE AMORPHOUS CHARGE 

分 类 号：TN383.1[电子电信—物理电子学]