Warm white-light emitting silica films prepared using lead-free double perovskite QDs

Zexin Li; Fenglei Sun; Haining Song; Haifeng Zhou; Yifei zhou; Zhenlei Yuan; Peng Guo; Guangjun Zhou; Qianqian Zhuang; Xiaoqiang Yu

doi:10.1039/D1DT01325D

Warm white-light emitting silica films prepared using lead-free double perovskite QDs†

Zexin Li,^a Fenglei Sun,^a Haining Song,^a Haifeng Zhou,*^b Yifei zhou,^c Zhenlei Yuan,^a Peng Guo,^a Guangjun Zhou,

*^a Qianqian Zhuang^d and Xiaoqiang Yu

^a

Author affiliations

* Corresponding authors

^a State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, PR China
E-mail: gjzhou@sdu.edu.cn

^b School of Materials Science and Engineering, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250353, PR China
E-mail: hfzhou@qlu.edu.cn

^c School of Mechanical, Electrical & Information Engineering, Shandong University, Weihai, P.R. China

^d State Key Laboratory of Biobased Material and Green Papermaking, School of Bioengineering, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250353, China

Abstract

Lead-free double perovskite has attracted widespread attention due to its good stability and non-toxicity. In this work, Cs₂Ag_xNa_1−xInCl₆ quantum dots were synthesized via a thermal injection method using non-toxic precursors. Based on the wide spectrum of self-bound excitons, the quantum dots achieved white light emission. Bi-doped Cs₂Ag_xNa_1−xInCl₆ quantum dots with excellent luminescence performance have the same cubic structure, and they have a larger Stokes shift. The cubic perovskite space group is Fm [3 with combining macron] m, and [NaCl₆], [AgCl₆] and [InCl₆] octahedrons alternately appear in the cubic structure. The photoluminescence quantum yield of Cs₂Ag_xNa_1−xInCl₆ is improved by doping with a small amount of Bi; the PL QY increased to 57.3% with an obvious emission peak at 600 nm. The stability and luminescence intensity of perovskite QDs were further enhanced by SiO₂ coating and a Cs₂Ag_xNa_1−xInCl₆:Bi-SiO₂ thin film was prepared using perhydropolysilazane as the precursor. The materials have huge application potential in the field of white light emission and display.

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Warm white-light emitting silica films prepared using lead-free double perovskite QDs†

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Warm white-light emitting silica films prepared using lead-free double perovskite QDs

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