首页|Single-crystalline hole-transporting layers for efficient and stable organic light-emitting devices
Single-crystalline hole-transporting layers for efficient and stable organic light-emitting devices
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国家科技期刊平台
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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,defect-induced 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 high-mobility 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.
State Key Laboratory of Integrated Optoelectronics,College of Electronic Science and Engineering,Jilin University,2699 Qianjin Street,130012 Changchun,China
State Key Laboratory of Supermolecular Structures and Materials,The Institute of Theoretical Chemistry,Jilin University,2699 Qianjin Street,130012 Changchun,China
Wuhan National Laboratory for Optoelectronics,Huazhong University of Science and Technology,430074 Wuhan,China
National Key Research and Development Program of ChinaNational Key Research and Development Program of ChinaNatural Science Foundation of ChinaNatural Science Foundation of China
国家科技期刊平台
NSTL
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