Yb3+/Eu3+/Ho3+ Tridoped Cs2Ag0.3Na0.7InCl6 Double Perovskite with Excitation-Wavelength-Dependent Triple Emission for Anti-Counterfeiting Application
نویسندگان
چکیده
Developing a secure anti-counterfeiting technology with more dimensional encryptions is urgently demanded. The lead-free double perovskite (DP) family represented by A2BIBIIIX6 hold great potential for applications in advanced fluorescence owing to of large-bandgap engineering via BI/BIII site transmutation or exotic dopants. Herein, Ln3+ (Ln3+ = Eu3+, Ho3+, and Yb3+)-doped Cs2Ag0.3Na0.7InCl6 DP microcrystals (MCs) were firstly successfully synthesized hydrothermal method. By selective excitation different luminescence centrals through precise control wavelength, we demonstrate dynamic color tuning the Ln3+-doped DPMCs. Specifically, under various excitations UV 300, 394, NIR 980 nm, as-synthesized DPMCs display triple emissions warm yellow, red, green, respectively. yellow light stems from self-trapped exciton (STE) downconversion (DC) matrix, while red green lights can be attributed strong Eu3+ 5D0→7FJ (J 1, 2, 3, 4) DC Ho3+ (5F4→5I8) upconversion (UC) sensitized Yb3+. Thus, DPMCs, which possess tunable combined DC/UC luminescence, show an material high security level.
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ژورنال
عنوان ژورنال: Crystals
سال: 2022
ISSN: ['2073-4352']
DOI: https://doi.org/10.3390/cryst13010013