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Solution-Processed MoCl5 and its Composites for Tailoring Hole Injection in Near-Ultraviolet Organic Light-Emitting Diodes

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Abstract

Solution-processed MoCl5 and its composites of poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS)/MoCl5 (PEDOT:PSS underneath the MoCl5), MoCl5/PEDOT:PSS (MoCl5 underneath the PEDOT:PSS) and PEDOT:PSS+MoCl5 for tailoring hole injection in near-ultraviolet organic light-emitting diodes (OLEDs) are demonstrated. The surface morphology, electronic properties, and hole injection characteristics of these hole injection layers are examined with atomic force microscopy, x-ray photoelectron microscopy, UV–visible absorption, and impedance spectroscopy measurements. The hole injection capacity is enhanced by using MoCl5, PEDOT:PSS/MoCl5, MoCl5/PEDOT:PSS and PEDOT:PSS+MoCl5 in this order. With PEDOT:PSS+MoCl5 tailoring hole injection and 2-(4-biphenyl)-5-(4-tert-butylphenyl)-1,3,4-oxadiazole being emissive molecule, efficient near-ultraviolet OLED is demonstrated, showing maximum external quantum efficiency of 2.2%, maximum radiance of 6.5 mW/cm2, full width at half maximum of 44 nm, and electroluminescence peak of 407 nm. Our results open a novel approach for broadening MoCl5 applications and advancing short-wavelength OLEDs.

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Acknowledgment

This work was supported by the National Natural Science Foundation of China (62065004, 52063010, 62065005, and 51762011), Guangxi Natural Science Foundation (2018GXNSFDA294002), Key Research and Development Program of Guangxi (GuiKeAB19110032), and Innovation Project of Guangxi Graduate Education (YCSW2020162).

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The authors declare no known competing financial interests or personal relationships that influenced the work reported in this paper.

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Authors and Affiliations

  1. School of Materials Science and Engineering and Guangxi Key Laboratory of Information Materials, Guilin University of Electronic Technology, Guilin, 541004, People’s Republic of China

    Jiaxing Wang, Ping Cai, Dengli Yao, Xiaogang Xue, Dongliang Li & Xiaowen Zhang

  2. College of Electronic Information and Automation, Guilin University of Aerospace Technology, Guilin, 541004, People’s Republic of China

    Leilei Jia

  3. Guilin Key Laboratory of Microelectronic Electrode Materials and Biological Nanomaterials and National Special Mineral Materials Engineering Technology Research Center and Guangxi Key Laboratory of Superhard Materials, China Nonferrous Metal (Guilin) Geology and Mining Co., Ltd, Guilin, 541004, People’s Republic of China

    Lihui Wang & Zongliu Lu

  4. Guangxi Key Laboratory of Automatic Testing Technology and Instrument, Guilin University of Electronic Technology, Guilin, 541004, People’s Republic of China

    Fangrong Hu

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  1. Jiaxing Wang
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Wang, J., Cai, P., Jia, L. et al. Solution-Processed MoCl5 and its Composites for Tailoring Hole Injection in Near-Ultraviolet Organic Light-Emitting Diodes. J. Electron. Mater. 51, 1850–1856 (2022). https://doi.org/10.1007/s11664-022-09443-8

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