Mn and Cu codoped Cs<sub>2</sub>ZnBr<sub>4</sub> metal halide with multiexcitonic emission toward anti-counterfeiting
Meng Wang, Ruoting Yang, Shanshan Cheng, Gaoqiang Li, Mochen Jia, Xu Chen, Di Wu, Xinjian Li, Zhifeng Shi
Abstract
Abstract The growing demand for optical anti-counterfeiting technology requires the development of new environmentally-friendly smart materials with single-component, multimodal fluorescence. Herein, Cs 2 ZnBr 4 :0.3Mn 2+ &0.15Cu + , as an efficient multimodal luminescent material with excitation-wavelength-dependent emission is reported. Under 365 nm and 254 nm UV light excitation, Cs 2 ZnBr 4 :Mn 2+ &Cu + emits mutually independent green light at 525 nm and blue light at 470 nm, which origin from the emission of Mn 2+ and the Cu + enhanced self-trapped excitons of Cs 2 ZnBr 4 , respectively. Furthermore, the multiexcitonic emission is applied to anti-counterfeiting applications and information encryption and decryption engineering. This codoped strategy provides a colorful step to expand the new metal halide materials in fluorescent anti-counterfeiting and information encryption and decryption.