Research Article

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2020, 13(11): 2939–2949

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https://doi.org/10.1007/s12274-020-2951-1

Controllable optical emission wavelength in all-inorganic halide perovskite alloy microplates grown by two-step chemical vapor deposition

Mohammad K. Hossain1,2, Pengfei Guo5, Wayesh Qarony4, Yuen H. Tsang4, Chaoping Liu6,7, Sai W. Tsang3, Johnny C. Ho3, and Kin M. Yu1,3 (✉)

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1 Department of Physics, City University of Hong Kong, Kowloon, Hong Kong SAR, China
2 Department of Physics, Comilla University, Kotbari, Cumilla 3506, Bangladesh
3 Department of Materials Science and Engineering, City University of Hong Kong, Kowloon, Hong Kong SAR, China
4 Department of Applied Physics, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong SAR, China
5 College of Physics and Optoelectronics, Taiyuan University of Technology, Taiyuan 030024, China
6 Research Center for Advanced Optics and Photoelectronics, Department of Physics, College of Science, Shantou University, Shantou 515063, China
7 Key Laboratory of Intelligent Manufacturing Technology of MOE, Shantou University, Shantou 515063, China

Keywords: chemical vapor deposition, inorganic perovskites, quaternary alloys, emission spectrum, amplified spontaneous emissions (ASE)
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All-inorganic halide perovskites (IHP), CsPbX3 (X = Cl, Br, I) exhibiting efficient optical emissions within the spectral range of 410 to 730 nm are potential candidates for many optoelectronic devices. Anion alloying of these IHPs is expected to achieve tunable emission wavelength covering the entire visible spectrum. Here, we developed a two-step chemical vapor deposition (CVD) process for growing quaternary IHP CsPbX3 (X = Cl/Br and Br/I) alloys. By exploiting the fast diffusion of halide anions in IHPs, the alloy composition can be precisely controlled by the growth time of the respective layers once the growth of the individual ternary IHP is optimized. Hence complexities in the multi-parameter optimization in the conventional CVD growth of quaternary alloys can be mitigated. Using this process, we synthesized single crystalline, homogeneous and thermally stable CsPbCl3(1−x)Br3x and CsPbBr3(1−x)I3x perovskites alloy microplates and demonstrated continuously tunable emission covering the spectrum from 428 to 715 nm by varying the halide compositions in the alloys. These alloy microplates also exhibit room temperature amplified spontaneous emissions (ASE) along with strong photonic discharges from the microplate’s edges and hence are potentially useful as a gain medium as well as optical cavities for emissions with wavelengths covering the visible spectrum.
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Controllable optical emission wavelength in all-inorganic halide perovskite alloy microplates grown by two-step chemical vapor deposition. Nano Res. 2020, 13(11): 2939–2949 https://doi.org/10.1007/s12274-020-2951-1

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