Bi and Sb Codoped Cs2Ag0.1Na0.9InCl6 Double Perovskite with Excitation-Wavelength-Dependent Dual-Emission for Anti-Counterfeiting Application.
The growing demands for optical anti-counterfeiting technology require the development of new environmentally friendly materials with single component, multimodal fluorescence and high stability. Herein, the Bi/Sb codoped Cs2Ag0.1Na0.9InCl6 lead-free double perovskite material is reported as an efficient multimodal luminescence material with excitation-wavelength-dependent emission. When excited by 360 nm UV light, dual-emission is observed at 455 and 560 nm, which comes from the 3P1-1S0 transition of Sb3+ ions and self-trapped excitons (STEs), respectively. Under the 320 nm UV lamp, the microcrystals show only a blue emission centered at 455 nm. Therefore, the Bi/Sb codoped Cs2Ag0.1Na0.9InCl6 double perovskite emits blue and yellow lights under the 320 and 360 nm UV lamp, respectively. Moreover, the obtained double perovskite shows a high PLQY up to 41% and excellent stability against both air and high temperature, which make it a promising anti-counterfeiting material.
['Li|Xiang|X|', 'Xu|Shuhong|S|', 'Liu|Fan|F|', 'Qu|Junfeng|J|', 'Shao|Haibao|H|', 'Wang|Zhuyuan|Z|https://orcid.org/0000-0003-1262-5342', 'Cui|Yiping|Y|https://orcid.org/0000-0002-4648-2506', 'Ban|Dayan|D|', 'Wang|Chunlei|C|https://orcid.org/0000-0002-7675-8921']
double perovskite anti-counterfeiting lead-free excitation-wavelength-dependent emission Cs2NaInCl6