Chin. Phys. Lett.  2012, Vol. 29 Issue (11): 117302    DOI: 10.1088/0256-307X/29/11/117302
CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
The Formation of Exciplex and Improved Turn-on Voltage in a Hybrid Organic-Inorganic Light-Emitting Diode
ZHANG Yan-Fei, ZHAO Su-Ling**, XU Zheng, KONG Chao
Key Laboratory of Luminescence and Optical Information (Ministry of Education), Beijing Jiaotong University, Beijing 100044 Institute of Optoelectronics Technology, Beijing Jiaotong University, Beijing 100044
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ZHANG Yan-Fei, ZHAO Su-Ling, XU Zheng et al  2012 Chin. Phys. Lett. 29 117302
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Abstract In order to take advantage of organic and inorganic materials, we chose the polymer MEH-PPV as the luminous layer and ZnS as the electron transporting layer to prepare hybrid organic-inorganic light-emitting diodes (HOILEDs): ITO/MEH-PPV(~70 nm)/ZnS(20 nm)/Al by thermal evaporation and spin coating. Compared with the single-layer device ITO/MEH-PPV(~70 nm)/Al, spectral broadening and a slightly red shift are observed. Compared with the pure organic device ITO/MEH-PPV(~70 nm)/BCP (20 nm)/Al and combined with the energy level structure diagram, it is concluded that the spectral broadening and red shift are due to the exciplex luminescence at the interface between MEH-PPV and ZnS or BCP. In addition, the hybrid inorganic-organic device shows a lower turn-on voltage, but the current efficiency is lower than that of the pure organic device with the same structure.
Received: 27 June 2012      Published: 28 November 2012
PACS:  73.61.Ga (II-VI semiconductors)  
  71.35.-y (Excitons and related phenomena)  
  78.60.Fi (Electroluminescence)  
  78.40.Me (Organic compounds and polymers)  
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https://cpl.iphy.ac.cn/10.1088/0256-307X/29/11/117302       OR      https://cpl.iphy.ac.cn/Y2012/V29/I11/117302
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ZHANG Yan-Fei
ZHAO Su-Ling
XU Zheng
KONG Chao
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