Achieving a Cr6+-free Cr3+-activated spinel phosphor by a one-step solid-state reaction

Yiqing Zhou; Quantian Cao; Yue Han; Zhongxian Qiu; Jilin Zhang; Wenli Zhou; Shixun Lian

doi:10.1039/D4QI01446D

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Achieving a Cr⁶⁺-free Cr³⁺-activated spinel phosphor by a one-step solid-state reaction†

Yiqing Zhou,^a Quantian Cao,^a Yue Han,^a Zhongxian Qiu,

*^a Jilin Zhang,

^a Wenli Zhou

^a and Shixun Lian

*^a

Author affiliations

* Corresponding authors

^a Key Laboratory of Light Energy Conversion Materials of Hunan Province College, Key Laboratory of Chemical Biology & Traditional Chinese Medicine Research (Ministry of Education), College of Chemistry and Chemical Engineering, Hunan Normal University, Changsha 410081, China
E-mail: zxqiu@hunnu.edu.cn, sxlian@hunnu.edu.cn

Abstract

Cr³⁺-doped oxide phosphors attract increasing attention due to their tunable photoluminescence and versatile applications. Meanwhile, a hidden danger of toxic Cr⁶⁺-formation during the synthesis of Cr³⁺ phosphors should also be emphasized. Herein, a co-doping strategy of Bi³⁺ to a spinel-typed ZnAl₂O₄:Cr³⁺ phosphor is performed and thoroughly suppresses the formation of Cr(VI). As a result, an environmentally friendly Cr⁶⁺-free Cr³⁺-activated phosphor is successfully synthesized by a one-step solid-phase method in an air atmosphere. The mechanism of Cr(VI) suppression is investigated. In the absence of the Cr(VI) impurity, ZnAl₂O₄:Cr³⁺,Bi³⁺ shows an over doubled luminescence intensity than that of the pristine ZnAl₂O₄:Cr³⁺. This work offers an effective way to prevent Cr(VI) pollution fundamentally for the production and application of Cr³⁺ activated phosphors.

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Article information

DOI: https://doi.org/10.1039/D4QI01446D
Article type: Research Article
Submitted: 09 Jun 2024
Accepted: 22 Jul 2024
First published: 24 Jul 2024

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Inorg. Chem. Front., 2024,11, 6127-6134

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Achieving a Cr⁶⁺-free Cr³⁺-activated spinel phosphor by a one-step solid-state reaction

Y. Zhou, Q. Cao, Y. Han, Z. Qiu, J. Zhang, W. Zhou and S. Lian, Inorg. Chem. Front., 2024, 11, 6127 DOI: 10.1039/D4QI01446D

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