Broadening the valid temperature range of optical thermometry through dual-mode design

• Published in: Journal of materials chemistry. C, Materials for optical and electronic devices Materials for optical and electronic devices, 2018, Vol.6 (41), p.11178-11183
• Main Authors: Gao, Yan, Cheng, Yao, Hu, Tao, Ji, Zeliang, Lin, Hang, Xu, Ju, Wang, Yuansheng
• Format: Article
• Language: English
• Subjects: Charge transfer; Fluorescence; Luminescence; Perovskites; Sensitivity; Synthesis; Temperature; Thermometry
• ISSN: 2050-7526; 2050-7534
• DOI: 10.1039/c8tc03851a

In this study, a double-perovskite Pr 3+ :Gd 2 ZnTiO 6 thermometric phosphor is designed and successfully synthesized for the first time via a high-temperature solid-state method. By taking advantage of the intervalence charge transfer state (IVCT) interfered Pr 3+ luminescence, the synthesized phosphor exhibits excellent optical thermometric performance in terms of both the fluorescence intensity ratio and luminescence lifetime. Specifically, by using the fluorescence intensity ratio between Pr 3+ : 3 P 0 → 3 H 4 and 1 D 2 → 3 H 4 transitions as a temperature detecting signal in the range of 293-433 K, the maximum absolute and relative sensitivities reach as high as 0.63 K −1 and 1.67% K −1 , respectively; taking the fluorescence lifetime of the 1 D 2 state as a detecting signal in the range of 433-593 K, the corresponding sensitivities are 0.096 μs K −1 and 1.48% K −1 . The results demonstrate that a thermal reading with high sensitivity over a wide range of temperature can be realized by this novel dual-mode design. This study highlights a highly sensitive dual-mode optical thermometer Pr 3+ :Gd 2 ZnTiO 6 for thermal readings over a wide range of temperature.