Issue 27, 2019

Color tunable upconversion luminescent perovskite fluoride with long-/short-lived emissions toward multiple anti-counterfeiting

Abstract

In contrast to simply static fluorescence, the introduction of time-resolved visualized fluorescence in materials can significantly improve their anti-counterfeiting performance; however, this remains challenging with photon upconversion (UC) luminescent materials. Herein, we demonstrate a color-tunable UC luminescent perovskite fluoride KCdF3:Yb3+,Mn2+,Ln3+ (Ln3+ = Er3+, Ho3+, Tm3+) with both long (∼20–40 ms) and short (∼0.4–2 ms) emission lifetimes. Under steady 980 nm laser excitation, color-tunable steady UC fluorescence from yellow to red (or green) and yellow to blue (including UC white emission) could be easily achieved by tuning the doping concentration of Mn2+ and Ln3+ in the system; whereas, an unalterable yellow UC afterglow was observed by the naked eye when the excitation source was removed. Moreover, the upconversion nanoparticles (UCNPs) exhibited excellent pump power- and temperature-dependent luminescence stability. Static and dynamic photoluminescence analysis provided an understanding of the unique UC luminescence in this system, and a bidirectional energy transfer UC mechanism between Mn2+ (or Yb3+–Mn2+ dimer) and Ln3+ is presented. The multiple anti-counterfeiting prototype using the unique UC luminescent materials demonstrated a high throughput authentication rate without the need for complex, time-gated decoding instrumentation, suggesting their high potential for anti-counterfeiting application, and also providing new insights for the design of photon UC luminescence materials.

Graphical abstract: Color tunable upconversion luminescent perovskite fluoride with long-/short-lived emissions toward multiple anti-counterfeiting

Supplementary files

Article information

Article type
Paper
Submitted
24 Apr 2019
Accepted
31 May 2019
First published
01 Jun 2019

J. Mater. Chem. C, 2019,7, 8226-8235

Color tunable upconversion luminescent perovskite fluoride with long-/short-lived emissions toward multiple anti-counterfeiting

X. Han, E. Song, B. Zhou and Q. Zhang, J. Mater. Chem. C, 2019, 7, 8226 DOI: 10.1039/C9TC02171J

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