Issue 16, 2023

Design of anti-thermal quenching Pr3+-doped niobate phosphors based on a charge transfer and intervalence charge transfer band excitation-driven strategy

Abstract

Thermal quenching limits further large-scale applications of Pr3+-doped phosphors. Research shows that intervalence charge transfer (IVCT) can be used as both the quenching luminescence channel and the red-emitting compensation channel for Pr3+-doped phosphors due to its unique dual-function mechanism. The problem of how to reduce quenching and improve compensation effects through IVCT has become an important issue. In this contribution, a dual compensation mechanism is proposed by designing an excitation-driven strategy of charge transfer (CT) and IVCT, thus realizing anti-thermal quenching of red light. Under different excitation-driven strategies, YNbO4:x%Pr3+ phosphors exhibited both single compensation and dual compensation effects in red emission. In the case of excitation of the IVCT band alone, the 3P0 energy level electrons of Pr3+ were transferred to the 1D2 level through the IVCT state formed between Pr3+ and Nb5+, resulting in enhanced red emission from the 1D23H4 transition of Pr3+. In the case of simultaneously exciting the charge transfer band (CTB) and the IVCT band, there is a charge transfer from both the host matrix and the Pr3+ 3P0 level to the 1D2 level, leading to higher red emission intensities in all samples within the temperature range of 303 K to 523 K compared to single compensation. Notably, the YNbO4:0.1%Pr3+ sample exhibited a maximum comprehensive intensity of red emission under dual compensation, reaching 2.18 times its intensity at 303 K, significantly higher than the 1.38 times its intensity under single compensation. Furthermore, this phosphor exhibits high optical temperature sensing sensitivity and excellent thermochromic properties, allowing for both quantitative and qualitative temperature measurements. This work provided a new avenue for the development of Pr3+-doped niobate anti-thermal quenching luminescent materials.

Graphical abstract: Design of anti-thermal quenching Pr3+-doped niobate phosphors based on a charge transfer and intervalence charge transfer band excitation-driven strategy

Supplementary files

Article information

Article type
Research Article
Submitted
31 May 2023
Accepted
07 Jul 2023
First published
07 Jul 2023

Inorg. Chem. Front., 2023,10, 4808-4818

Design of anti-thermal quenching Pr3+-doped niobate phosphors based on a charge transfer and intervalence charge transfer band excitation-driven strategy

C. Yang, N. Guo, S. Qu, Q. Ma, J. Liu, S. Chen and R. Ouyang, Inorg. Chem. Front., 2023, 10, 4808 DOI: 10.1039/D3QI01009K

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