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Designing Color-tunable luminescent thermometers and information encryption based on Pr3+ or Sm3+ doped SrNb2O6: Tb3+ phosphors via energy transfer

[Display omitted] •MMCT → IVCT and MMCT → 4f ET processes based Tb3+-Pr3+/Sm3+ doped SNO are discussed.•The effect of different ET process on temperature sensing performance has been investigated.•Tb3+or Pr3+ doped SNO exhibit good potential application of information hiding and encryption. Color-tu...

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Published in:Optics and laser technology 2022-12, Vol.156, p.108603, Article 108603
Main Authors: Sun, Zhen, Zhang, Anqi, Fu, Zuoling, Ma, Liang
Format: Article
Language:English
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Summary:[Display omitted] •MMCT → IVCT and MMCT → 4f ET processes based Tb3+-Pr3+/Sm3+ doped SNO are discussed.•The effect of different ET process on temperature sensing performance has been investigated.•Tb3+or Pr3+ doped SNO exhibit good potential application of information hiding and encryption. Color-tunable luminescence intensity ratio thermometers and information encryption are firstly designed through different energy transfer mechanism. Herein, two types thermometric materials, SrNb2O6: Tb3+, Pr3+ and SrNb2O6: Tb3+, Sm3+ are prepared. The Tb3+ and Pr3+ typical emissions show luminescence mechanism between two intervalence charge transfer states. Whereas, Tb3+ and Sm3+ emissions are related to energy migration from intervalence charge transfer state to 4f level. Interestingly, (5D4→7F5)Tb3+/(1D2→3H4)Pr3+ or (5D4→7F5)Tb3+/(4G5/2→6H7/2)Sm3+ have different temperature sensing properties due to distinct energy transfer processes and provide visualization of temperature measurement. The former gains high sensitivity (Sa = 0.012 K−1) at high temperature region, and the latter reach as high as Sa = 0.028 K−1 at low temperature. Besides, using multi-mode color emission of Tb3+ or Pr3+ doped SrNb2O6 achieves information hiding. This work not only shows new strategy to develop high-efficiency luminescent thermometers but also develop flexible optical encryption technology.
ISSN:0030-3992
1879-2545
DOI:10.1016/j.optlastec.2022.108603