Anomalous Fluorescence Thermal Quenching in a Red-emitting RbZnF3:Eu3+ Phosphor under Violet Excitation

doi:10.15541/jim20250442

Abstract

Abstract: Thermal quenching is a key challenge in the application of fluorescent materials in solid state lighting devices. Herein, we report a perovskite phosphor RbZnF₃:Eu³⁺ exhibiting anti-thermal quenching behavior. Under violet excitation, this phosphor yields bright red emission. As the temperature rises, the luminescence intensity first increases up to 175 ℃ (i.e., anti-thermal quenching) and then decreases. When the temperature is above 200 ℃, the luminescence intensity falls below the value at room temperature. We carry out comprehensive characterizations and propose that the observed anti-thermal quenching behavior is mainly due to the existence of defect levels. First-principles calculations show that Rb vacancy and F vacancy could be responsible for the observed defect levels. We also fabricate a white LED using the RbZnF₃:Eu³⁺ phosphor to verify its potential application.

Key words: phosphors, thermal quenching, perovskite, LED, defect engineering

CLC Number:

TB34

DONG Langping, LI Shixuan, YANG Shaoxing, HOU Jingshan, LIN Yandan, ZHOU Pengcheng, SUN Xuejiao, SUN Yiyang, CHEN Daqin, FANG Yongzheng. Anomalous Fluorescence Thermal Quenching in a Red-emitting RbZnF₃:Eu³⁺ Phosphor under Violet Excitation[J]. Journal of Inorganic Materials, DOI: 10.15541/jim20250442.

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Anomalous Fluorescence Thermal Quenching in a Red-emitting RbZnF₃:Eu³⁺ Phosphor under Violet Excitation

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