Structure, luminescence of Eu2+and Eu3+in CaMgSi2O6and their co-existence for the excitation-wavelength/temperature driven colour evolution

Fang Su, Weijie Zhou, Yunlin Yang, Yiyi Ou, Zeming Qi, Chang Kui Duan, Mikhail G. Brik, Pieter Dorenbos, Hongbin Liang

Research output: Contribution to journalArticleScientificpeer-review

1 Citation (Scopus)

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.

Original languageEnglish
Pages (from-to)10050-10058
JournalDalton Transactions
Volume50
Issue number29
DOIs
Publication statusPublished - 2021

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