4.6 Article

Blue-emitting 0D Cs3ZnX5 (X = Cl, Br) perovskite nanocrystals based on self-trapped excitons

期刊

JOURNAL OF LUMINESCENCE
卷 249, 期 -, 页码 -

出版社

ELSEVIER
DOI: 10.1016/j.jlumin.2022.119048

关键词

Blue luminescence; Cs3ZnX5; Perovskite nanocrystals; Defects; Self-trapped excitons

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资金

  1. Fund of Fujian Science & Technology Innovation Laboratory for Optoelectronic Information [2020ZZ114]
  2. Key Research Program of Frontier Science CAS [QYZDY-SSW-SLH025]
  3. National Natural Science Foundation of China [21731006, 21871256]
  4. Fund of Advanced Energy Science and Technology Guangdong Laboratory [DJLTN0200/DJLTN0240]

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This article describes a modified hot-injection method for preparing pure-blue and sky-blue emitting 0D Cs3ZnX5 perovskite nanocrystals with excellent stability. Experimental results and first-principles calculations confirm that the blue emissions are dominated by halide vacancies in the perovskite structure.
All-inorganic Pb-free halide perovskites have recently received extensive attention due to their unique structures and optoelectronic properties. However, the realization of pure-blue emitting perovskite nanocrystals (NCs) with satisfactory stability and rational interpretation for their corresponding self-trapped excitons (STEs) emissions remains an arduous task. Herein, a modified hot-injection method is proposed to prepare a new family of zero-dimensional (0D) Cs3ZnX5 (X = Cl, Br) perovskite NCs with pure-blue and sky-blue photoluminescence (PL) emissions. Benefitting from the 0D tetragonal-phase structure, the Cs3ZnX5 NCs possess outstanding long-term stability in ambient air conditions. We employ the experimental results and first-principles calculations to confirm that the blue STEs emission of Cs3ZnX5 NCs is dominated by the halide vacancies (V-X) in [ZnX4](2- )tetrahedra. Our findings not only provide a simple and valid method to control the synthesis of blue-emitting 0D Zn-based perovskite NCs, but also clarify their underlying PL mechanism.

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