Chinese Journal of Quantum Electronics, Volume. 36, Issue 6, 705(2019)
Preparation of stable and efficient mixed-halide perovskite based light emitting diodes
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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Received: Mar. 28, 2019
Accepted: --
Published Online: Dec. 6, 2019
The Author Email: Weisheng FAN (fwsheng@mail.ustc.edu.cn)