Spectral Tunability, Luminescence Enhancement, and Temperature Sensitivity of Sb3+-Doped Bismuth-Based Halide Emission Crystals for Anti-Counterfeiting Applications

Meng Gao; Yuexiao Pan; Hongzhou Lian; Jun Lin

doi:10.1021/acs.inorgchem.3c03003

Spectral Tunability, Luminescence Enhancement, and Temperature Sensitivity of Sb³⁺-Doped Bismuth-Based Halide Emission Crystals for Anti-Counterfeiting Applications

Inorg Chem. 2023 Oct 23;62(42):17537-17546. doi: 10.1021/acs.inorgchem.3c03003. Epub 2023 Oct 10.

Authors

Meng Gao¹, Yuexiao Pan¹, Hongzhou Lian², Jun Lin²

Affiliations

¹ Key Laboratory of Carbon Materials of Zhejiang Province, College of Chemistry and Materials Engineering, Wenzhou University, Wenzhou 325035, P. R. China.
² State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, P. R. China.

PMID: 37815892
DOI: 10.1021/acs.inorgchem.3c03003

Abstract

The synthesis of sustainable luminescent materials with simplicity, low energy consumption, and nontoxicity is of great importance in the field of chemistry and materials science. In this study, a room temperature evaporation method was employed to synthesize Sb³⁺-doped bismuth-based halide emission crystals, allowing for investigation of spectral tuning, luminescence enhancement, and temperature sensitivity. By substitution of Rb⁺ with varying concentrations of Cs⁺ in Rb₃BiCl₆ (RBC), the luminescent color of the crystals can be tuned from orange to yellow. The resulting alloyed yellow-emitting crystals were identified as Rb₂CsBiCl₆ (RCBC). Remarkably, when one-third of the Rb⁺ ions were replaced by Cs⁺ in the RBC, the crystals exhibited improved thermal stability and a 20-fold increase in luminescence intensity. The temperature-sensitive behavior was observed for RBC:Sb, with emission shifting from 590 to 574 nm upon heating while the yellow emission of RCBC:Sb exhibited no significant peak shift with temperature. Notably, the yellow emission of RBC:Sb could be reversibly converted back to orange light upon cooling to room temperature. In contrast, RCBC:Sb exhibited no significant peak shift with temperature. The differential temperature sensitivity between RBC:Sb and RCBC:Sb offers potential applications in anti-counterfeiting measures.