4.6 Article

Enhanced electroluminescent performance by doping organic conjugated ionic compound into graphene oxide hole-injecting layer

期刊

JOURNAL OF MATERIALS SCIENCE
卷 54, 期 19, 页码 12688-12697

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SPRINGER
DOI: 10.1007/s10853-019-03820-1

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资金

  1. National Natural Science Foundation of China (NSFC) [U1304212, 21274133, 20774088, 21374106]
  2. Development Foundation for Distinguished Junior Researchers at Zhengzhou University [1421320043]

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Organic conjugated ionic compound 10,10 '-dimethyl-9,9 '-biacridinum bis(monomethyl terephthalate) (MMT) is doped into graphene oxide (GO) hole-injecting layer to enhance the electroluminescent performance of organic light-emitting diodes (OLEDs). The composite films are characterized in detail by FTIR, SEM, XPS, and UPS. The XPS result indicates the evident pi-pi stacking interaction between the conjugated structures of GO and MMT. The UPS result shows the decrease in ionization potential of GO due to MMT-doping. As a result, at the optimal doping ratio of 4wt%, the maximum luminous efficiency of OLEDs is increased to 15.46cd/A, which is 3.4 times as 4.55cd/A of the control device. Besides, the luminance is also enhanced to 19950cd/m(2), while the turn-on voltage is decreased to 2.5V. Doping organic conjugated ionic compound into the GO hole-injecting layer is a facile and efficient approach to improve the electroluminescent performance of OLEDs.

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