Structure, luminescence of Eu<sup>2+</sup>and Eu<sup>3+</sup>in CaMgSi<sub>2</sub>O<sub>6</sub>and their co-existence for the excitation-wavelength/temperature driven colour evolution

Journal article (2021)

Authors

Fang Su Sun Yat-sen University
Weijie Zhou Sun Yat-sen University
Yunlin Yang Sun Yat-sen University
Yiyi Ou Sun Yat-sen University
Zeming Qi University of Science and Technology of China
Chang Kui Duan University of Science and Technology of China
Mikhail G. Brik Chongqing University of Posts and Telecommunications, University of Tartu, Jan Długosz University
Pieter Dorenbos RST/Luminescence Materials - AS
Hongbin Liang Sun Yat-sen University
Research Group
RST/Luminescence Materials (AS) (TU Delft)
More Info
expand_more

Published Date

2021

Language

English

Reuse Rights

Other than for strictly personal use, it is not permitted to download, forward or distribute the text or part of it, without the consent of the author(s) and/or copyright holder(s), unless the work is under an open content license such as Creative Commons.

Faculty

Applied Sciences

Department

RST/Radiation, Science and Technology

Research Group

RST/Luminescence Materials

Abstract

Luminescent materials with controllable colour evolution features are demanded for the development of multi-level anti-counterfeiting technologies. Here we report the structural and luminescence properties of CaMgSi2O6:Ln (Ln = Eu2+, Eu3+, Eu2+/3+) samples in detail and reveal their excitation-wavelength/temperature driven colour evolution characteristics. By tuning either the excitation-wavelength (276, 304, 343, 394 nm) or temperature (in the 330-505 K range), the designed samples with co-existing Eu2+/Eu3+ions can achieve diverse and controllable colour evolution from red, to pink, purple and blue. This shows their potential application in anti-counterfeiting with the help of sophisticated pattern design. In addition, the underlying mechanism of the Stokes shift of the Eu2+emission and valence stability of both Eu2+/Eu3+ions in CaMgSi2O6are also studied in depth. These results are valuable for designing colour-controllable luminescent materials based on the co-existence of the Eu2+/Eu3+ions for anti-counterfeiting applications.

Files

D1dt01377g.pdf
(.pdf | 2.39 Mb)