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

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Abstract

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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Acknowledgements

This work was financially supported by CityU SGP (No. 9380076).

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Authors and Affiliations

  1. Department of Physics, City University of Hong Kong, Kowloon, Hong Kong SAR, China

    Mohammad K. Hossain & Kin M. Yu

  2. Department of Physics, Comilla University, Kotbari, Cumilla, 3506, Bangladesh

    Mohammad K. Hossain

  3. Department of Materials Science and Engineering, City University of Hong Kong, Kowloon, Hong Kong SAR, China

    Sai W. Tsang, Johnny C. Ho & Kin M. Yu

  4. Department of Applied Physics, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong SAR, China

    Wayesh Qarony & Yuen H. Tsang

  5. College of Physics and Optoelectronics, Taiyuan University of Technology, Taiyuan, 030024, China

    Pengfei Guo

  6. Research Center for Advanced Optics and Photoelectronics, Department of Physics, College of Science, Shantou University, Shantou, 515063, China

    Chaoping Liu

  7. Key Laboratory of Intelligent Manufacturing Technology of MOE, Shantou University, Shantou, 515063, China

    Chaoping Liu

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  1. Mohammad K. Hossain
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Controllable optical emission wavelength in all-inorganic halide perovskite alloy microplates grown by two-step chemical vapor deposition

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Hossain, M.K., Guo, P., Qarony, W. et al. Controllable optical emission wavelength in all-inorganic halide perovskite alloy microplates grown by two-step chemical vapor deposition. Nano Res. 13, 2939–2949 (2020). https://doi.org/10.1007/s12274-020-2951-1

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