Structural Confinement Induced Near‐Unity Quantum Yield for Single‐Band Ratiometric Thermometry

Author:

Chang Jiwen1,Wang Yu1,Zhang Zixuan1,Guo Dongxu1,Zhao Peihang1,Wang Nan1,Wang Zhijun1,Li Leipeng1,Li Panlai1,Suo Hao1ORCID

Affiliation:

1. National‐Local Joint Engineering Laboratory of New Energy Photoelectric Devices, Hebei Key Laboratory of Optic‐electronic Information and Materials, College of Physics Science & Technology Hebei University Baoding 071002 China

Abstract

AbstractLuminescence quenching at high dopant concentration and temperature typically limits the brightness of luminescence materials, which remains a major obstacle in diverse technological applications, especially in the field of luminescence thermometry. In this work, a unique class of non‐concentration quenching double‐tungstate phosphors is reported that feature the near‐unity quantum yield of Tb3+ and Eu3+ emissions induced by the structural confinement effect. Mechanistic studies affirm that the activator ions can be isolated in NaYW2O8 crystal to confine the absorbed photon energy, leading to a relatively high quenching concentration of various lanthanide activators. By facilitating interionic cross‐relaxation at heavy dopant concentration, a remarkable thermal enhancement of Tb3+ emissions over 20‐fold upon the excitation of excited‐state absorption is recorded. In contrast, thermally quenched emissions are detected under the excitation of ground‐state absorption. This excitation wavelength‐dependent thermal behavior of Tb3+ emissions is harnessed for single‐band ratiometric thermometry, registering superior thermal sensitivity and resolution (Sr = 4.01% K−1, δT = 0.1 K). The advances in combating concentration and thermal quenching of luminescence materials provide exciting opportunities for flexible thermometry in real‐world sensing scenarios.

Funder

Natural Science Foundation of Hebei Province

National Natural Science Foundation of China

Publisher

Wiley

Subject

Condensed Matter Physics,Atomic and Molecular Physics, and Optics,Electronic, Optical and Magnetic Materials

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