期刊
DALTON TRANSACTIONS
卷 50, 期 28, 页码 9804-9811出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/d1dt01325d
关键词
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资金
- Foundation of Shandong Industrial Technology Research Institute [Z1250020007, Z1250020008]
- National Natural Science Foundation of China [5147150, 21808114]
- Foundation of State Key Laboratory of Biobased Material and Green Papermaking, Qilu University of Technology (Shandong Academy of Sciences) [ZZ20190310]
Lead-free double perovskite quantum dots were synthesized with white light emission properties, and their luminescence performance and stability were improved by Bi doping and SiO2 coating.
Lead-free double perovskite has attracted widespread attention due to its good stability and non-toxicity. In this work, Cs2AgxNa1-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 Cs2AgxNa1-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 Fm3m, and [NaCl6], [AgCl6] and [InCl6] octahedrons alternately appear in the cubic structure. The photoluminescence quantum yield of Cs2AgxNa1-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 Cs2AgxNa1-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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