Chinese Journal of Quantum Electronics, Volume. 36, Issue 6, 705(2019)

Preparation of stable and efficient mixed-halide perovskite based light emitting diodes

Weisheng FAN1,2、* and Xinhua LI1
Author Affiliations
  • 1[in Chinese]
  • 2[in Chinese]
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    It is a remarkable advantage of organic-inorganic hybrid perovskite that their bandgap can be tuned by adjusting the stoichiometric ratio of halides, which is critical to their applications in tandem solar cells, wavelength-tunable light emitting diodes (LEDs) and laser. However, illumination or applied bias will cause the phase separation of mixed-halide perovskite, resulting in the formation of iodide-rich domains, the reduction of photovoltaic devices open-circuit voltage, and the emission wavelength of luminous LED being pinned to the infrared region. The phase separation is suppressed by covering self-assembled long-chain organic ammonium capping layers on nanometer-sized grain surfaces, and the LED with stable emission wavelength is obtained with external quantum efficiency being improved to 2%.

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    FAN Weisheng, LI Xinhua. Preparation of stable and efficient mixed-halide perovskite based light emitting diodes[J]. Chinese Journal of Quantum Electronics, 2019, 36(6): 705

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    Paper Information

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    Received: Mar. 28, 2019

    Accepted: --

    Published Online: Dec. 6, 2019

    The Author Email: Weisheng FAN (fwsheng@mail.ustc.edu.cn)

    DOI:10.3969/j.issn.1007-5461. 2019.06.010

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