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Multiple Afterglows of Chiral Zinc (II) Halide Enabled by Regulating Coordination Bonds
Hongli Yu1, Yibo Cui1, Ruibin Hao1
1The Beijing Municipal Key Laboratory of New Energy Materials and Technologies, School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing, P. R. China.
Abstract:
Zero-dimensional (0D) hybrid halide materials are promising candidates for room-temperature phosphorescence (RTP) and hold significant potential for anti-counterfeiting applications. However, conventional anti-counterfeiting methods relying solely on spatial patterns are insufficient to meet rising demands for multidimensional security. Here, we report an excitation-responsive spatiotemporal triple-resolution anti-counterfeiting system based on heterocoordinated zinc-based halides, (R/S-C12H18N2)ZnCl2 and (R/S-C12H20N2)ZnCl4·H2O (R/S-C12H20N2 is (R)-3-Amino-1-benzylpiperidine and (S)-1-Benzyl-3-aminopiperidine). Specifically, (R/S-C12H20N2)ZnCl4·H2O exhibits a broad excitation window and dual afterglow emissions at 455 and 505 nm, while (R/S-C12H18N2)ZnCl2 displays blue afterglow at 460 nm. Coordination bond engineering enables tunable excitation-dependent phosphorescence, offering a powerful strategy for advanced time-gated and multilevel anti-counterfeiting applications.
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