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Research Article

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, Kin M. Yu1,3( )
Department of Physics, City University of Hong Kong, Kowloon, Hong Kong SAR, China
Department of Physics, Comilla University, Kotbari, Cumilla 3506, Bangladesh
Department of Materials Science and Engineering, City University of Hong Kong, Kowloon, Hong Kong SAR, China
Department of Applied Physics, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong SAR, China
College of Physics and Optoelectronics, Taiyuan University of Technology, Taiyuan 030024, China
Research Center for Advanced Optics and Photoelectronics, Department of Physics, College of Science, Shantou University, Shantou 515063, China
Key Laboratory of Intelligent Manufacturing Technology of MOE, Shantou University, Shantou 515063, China
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Graphical Abstract

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.

Keywords

chemical vapor depositioninorganic perovskitesquaternary alloysemission spectrumamplified spontaneous emissions (ASE)

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Nano Research
Volume 13 Issue 11,
November 2020
Pages 2939-2949
DOI: 10.1007/s12274-020-2951-1
Cite this article:
Hossain MK, 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 Research, 2020, 13(11): 2939-2949. https://doi.org/10.1007/s12274-020-2951-1
Topics:
Chemical vapor depositionChlorine compoundsLight emission Optoelectronic devicesPerovskite

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Received: 18 April 2020
Revised: 22 June 2020
Accepted: 24 June 2020
Published: 27 July 2020
© Tsinghua University Press and Springer-Verlag GmbH Germany, part of Springer Nature 2020
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