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. 2020 Jun 30;9:112. doi: 10.1038/s41377-020-00353-0

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© The Author(s) 2020

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 1 — a Crystal structure of the double perovskite. b Photographs of Cs₂Ag_0.6Na_0.4In_0.85Bi_0.15Cl₆ single crystals under daylight and UV light excitation. c XRD patterns (left) and selected diffraction peaks near 34° (right) of Cs₂Ag_0.6Na_0.4In_1-yBi_yCl₆ with different Bi³⁺ contents. d Photoluminescence excitation (PLE) spectra and e PL spectra of Cs₂Ag_0.6Na_0.4In_1-yBi_yCl₆ powder with different Bi³⁺ contents. f Photoluminescence quantum yield (PLQY) of Cs₂Ag_0.6Na_0.4In_1-yBi_yCl₆ powder with various Bi³⁺ contents