Dual-band white light emission and temperature-dependent luminescence of Sn2+ in the metastable structure of Cs2CaCl4(H2O)2

Hu Wang; Yuexiao Pan; Zhenyu Shi; Yeling Cao; Hongzhou Lian; Jun Lin; Qian Miao; Jun Zou

doi:10.1039/D4QI03288H

Dual-band white light emission and temperature-dependent luminescence of Sn²⁺ in the metastable structure of Cs₂CaCl₄(H₂O)₂†

Hu Wang,^a Yuexiao Pan,

*^a Zhenyu Shi,^a Yeling Cao,^a Hongzhou Lian,^b Jun Lin,

*^b Qian Miao^a and Jun Zou

*^cd

Author affiliations

* Corresponding authors

^a Key Laboratory of Carbon Materials of Zhejiang Province, College of Chemistry and Materials Engineering, Wenzhou University, Wenzhou 325035, P.R. China
E-mail: yxpan@wzu.edu.com

^b State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, P. R. China
E-mail: jlin@ciac.ac.cn

^c Institute of New Materials & Industrial Technology, Wenzhou University, Wenzhou 325024, China

^d School of Science, Shanghai Institute of Technology, Shanghai, China
E-mail: zoujun@sit.edu.cn

Abstract

The quest for novel luminescent materials with tunable color emission and temperature-sensing capabilities remains a vibrant field of research, particularly for applications in solid-state lighting and security features. The as-synthesized rod-like crystal Cs₂CaCl₄(H₂O)₂:Sn²⁺ (R-CCCH:Sn²⁺) exhibits dual-band white light emission characterized at 415 nm and 540 nm, which correspond to the singlet state and triplet state transitions of Sn²⁺, respectively. Upon heating from 298 to 428 K, an anomalous enhancement in the intensity of the 415 nm emission in R-CCCH:Sn²⁺ was observed while its 540 nm emission underwent significant thermal quenching. The observation of the temperature-dependent photoluminescence (PL) indicates that R-CCCH:Sn²⁺ exists in a metastable state. Upon calcination at 428 K for 20 min, R-CCCH:Sn²⁺ changed to the stable state particle-like crystal Cs₂CaCl₄(H₂O)₂:Sn²⁺ (P-CCCH:Sn²⁺), exhibiting STEs of the CCCH matrix and the ³P₁ → ¹S₀ transition of Sn²⁺. The significance of this work lies in the discovery of the metastable state in CCCH and the manipulation of Sn²⁺ to emit both singlet and triplet transitions, leading to white light emission.

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Article information

DOI: https://doi.org/10.1039/D4QI03288H
Article type: Research Article
Submitted: 21 Dec 2024
Accepted: 13 Jan 2025
First published: 15 Jan 2025

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Inorg. Chem. Front., 2025, Advance Article

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Dual-band white light emission and temperature-dependent luminescence of Sn²⁺ in the metastable structure of Cs₂CaCl₄(H₂O)₂

H. Wang, Y. Pan, Z. Shi, Y. Cao, H. Lian, J. Lin, Q. Miao and J. Zou, Inorg. Chem. Front., 2025, Advance Article , DOI: 10.1039/D4QI03288H

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