Issue 45, 2020

Glass-limited Yb/Er:NaLuF4 nanocrystals: reversible hexagonal-to-cubic phase transition and anti-counterfeiting

Abstract

The development of luminescent materials with concurrent tunable spectral profile and brightness is a great challenge to improve the security of the authentic items and shield against counterfeiting. Herein, we report the realization of in situ hexagonal-to-cubic phase transition of Yb/Er:NaLuF4 nanocrystals inside inorganic glass via simply modifying the heating (glass crystallization) temperature, leading to simultaneous control of upconversion emission color and intensity. Impressively, this peculiar phase transition process is reversible upon cyclic heating/cooling thermal-treatment and the accompanying repeatable upconversion emission behaviors are retained. It is experimentally demonstrated that multiple patterns visualized using screen-printing inks containing the investigated samples and the anti-counterfeiting prototypes are practically applicable by switching in situ glass crystallization temperatures. These findings show great promise of the designed lanthanide-doped NaLuF4@glass nanocomposites in high-level anticounterfeiting applications and give new insights for the development of advanced optical materials.

Graphical abstract: Glass-limited Yb/Er:NaLuF4 nanocrystals: reversible hexagonal-to-cubic phase transition and anti-counterfeiting

Supplementary files

Article information

Article type
Paper
Submitted
08 Aug 2020
Accepted
05 Oct 2020
First published
06 Oct 2020

J. Mater. Chem. C, 2020,8, 16151-16159

Glass-limited Yb/Er:NaLuF4 nanocrystals: reversible hexagonal-to-cubic phase transition and anti-counterfeiting

S. Wang, J. Lin, X. Li, J. Chen, C. Yang, P. Huang, Y. Cheng and D. Chen, J. Mater. Chem. C, 2020, 8, 16151 DOI: 10.1039/D0TC03775C

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