期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 881, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2021.160601
关键词
Double perovskite; Optical thermometry; Energy transfer; Color-tuning; Bi3+/Eu3+ doping
资金
- Natural Science Foundation of Zhejiang Province [LY18E020008, LGG19E020003]
- National Natural Science Foundation of China [61975193]
A novel dual-mode optical thermometer material La2ZnTiO6:Bi3+/Eu3+ was designed, prepared and characterized, showing high sensitivity and excellent signal discriminability. The material has great potential for precise, sensitive and reliable temperature detection.
Rigorous temperature measurement employed to characterize physic-chemical state has compelled scientists to explore more novel materials for contactless optical thermometry, which must overcome the drawbacks of low sensitivity and poor signal discriminability. Here, a novel dual-mode optical thermometer La2ZnTiO6: Bi3+/Eu3+ is designed, prepared and characterized via XRD, XPS, EPR, SEM, EDS, PL spectra and decay time. Under 350 nm excitation, the energy transfer process from Bi3+ to Eu3+ allows the samples to demonstrate adjustable multi-color emissions. The temperature-dependent emission spectra display that the luminescence intensity of Bi3+ ions decreases quite faster than that of Eu3+ ions with temperature, leading to a significant chromaticity shift (Delta E = 224 x10(-3) in 293-473 K) visible to naked eyes. Based on fluorescence intensity ratio of Eu3+ versus Bi3+ (FIR = I-Eu/I-Bi), the sample shows the maximum relative sensitivity (Sr) of similar to 1.50% K-1 at 293 K and excellent signal discriminability. Meanwhile, the D-5(0)-> F-7(2) transition of Eu3+ ions shows a thermal-responsive lifetime with the optimal Sr of 1.23% K-1 at 573 K. This work suggests that the La2ZnTiO6: Bi3+/Eu3+ double perovskite phosphor has a great potential for dual-mode optical thermometry, being beneficial to obtain precise, sensitive and reliable temperature detection. (C) 2021 Elsevier B.V. All rights reserved.
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