Cs2Ag0.1Na0.9BiCl6:Tm3+ Double Perovskite: Coprecipitation Preparation and Near-infrared Emission

doi:10.15541/jim20230005

Abstract

Abstract:

Cs₂NaBiCl₆ double perovskite with indirect band demonstrates near-infrared (NIR) wide-band emission, but its low efficacy limits its potential applications in the field of NIR. In this work, micron-sized Cs₂Ag_0.1Na_0.9BiCl₆:Tm³⁺ double perovskites were synthesized via the coprecipitation method, which shows enhanced NIR emission. Their optical absorption, photoluminescence emission (PL) and excitation (PLE), time-resolved photoluminescence, and photoluminescence quantum yield (PLQY) were investigated. The Cs₂Ag_0.1Na_0.9BiCl₆:Tm³⁺ shows optical bandgap of 3.06 eV and NIR broad emission peaking at 680 nm under 350 nm excitation due to recombination of self-trapped excitons (STEs). Meanwhile, a new emission peak could be observed at 810 nm due to Tm³⁺ doping. The PLQY in the band range of 780-830 nm can be increased by 6.05 times from 1.67% to 11.77% and in the band range of 650-900 nm can reach 25.22%. This study proves the feasibility of Cs₂Ag_0.1Na_0.9BiCl₆:Tm³⁺ double perovskite as new NIR emission material.

Key words: near-infrared emission, self-trapped excitons, coprecipitation, double perovskite, Cs₂Ag_0.1Na_0.9BiCl₆

CLC Number:

TQ422

WANG Machao, TANG Yangmin, DENG Mingxue, ZHOU Zhenzhen, LIU Xiaofeng, WANG Jiacheng, LIU Qian. Cs₂Ag_0.1Na_0.9BiCl₆:Tm³⁺ Double Perovskite: Coprecipitation Preparation and Near-infrared Emission[J]. Journal of Inorganic Materials, 2023, 38(9): 1083-1088.

Figures/Tables 5

Fig. 1 Microstructure of crystals (a) Crystal structure and (b) XRD patterns of Cs2NaBiCl6, Cs2Ag0.1Na0.9BiCl6, and Cs2Ag0.1Na0.9BiCl6:Tm3+; (c) SEM image (left) and EDS elemental mappings (right) of Cs2Ag0.1Na0.9BiCl6:Tm3+

Fig. 2 Band gaps of Cs2NaBiCl6, Cs2Ag0.1Na0.9BiCl6 and Cs2Ag0.1Na0.9BiCl6:Tm3+ crystals (a) Optical absorption; (b) Tauc plots. Colorful figures are available on the website

Fig. 3 XPS and Raman characterizations of crystals (a) Total XPS spectra, and (b) Ag3d, (c) Na1s, (d) Bi4f, and (e) Cl2p high-resolution XPS spectra of Cs2NaBiCl6, Cs2Ag0.1Na0.9BiCl6 and Cs2Ag0.1Na0.9BiCl6:Tm3+; (f) Raman spectra of Cs2Ag0.1Na0.9BiCl6 and Cs2NaBiCl6

Fig. 4 Optical properties of crystals (a) Photoluminescence emission (PL) spectra, (c) integrated NIR emission intensity and (d) photoluminescence quantum yield (PLQY) of Cs2NaBiCl6, Cs2Ag0.1Na0.9BiCl6 and Cs2Ag0.1Na0.9BiCl6:Tm3+; (b) excitation (PLE) spectra and (e) PL decay curves (λem = 680 nm) of Cs2Ag0.1Na0.9BiCl6 and Cs2Ag0.1Na0.9BiCl6:Tm3+; Colorful figures are available on website

Fig. 5 Schematic diagram of simplified energy levels for Cs2Ag0.1Na0.9BiCl6:Tm3+

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Cs₂Ag_0.1Na_0.9BiCl₆:Tm³⁺ Double Perovskite: Coprecipitation Preparation and Near-infrared Emission

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