Four-mode optical thermometers based on Eu3+,Mn4+ co-doped Sr2GdTaO6 double perovskite phosphors

• Published in: Optics and laser technology 2025-05, Vol.183, p.112295, Article 112295
• Main Authors: Feng, Mengjie, He, Guanlin, Gong, Yujia, Chen, Junyu, Guo, Hai
• Format: Article
• Language: English
• Subjects: Double perovskite phosphors; Fluorescence intensity ratio; Four-mode optical thermometer; Sr2GdTaO6:Eu3+,Mn4
• ISSN: 0030-3992
• DOI: 10.1016/j.optlastec.2024.112295

•A four-mode optical thermometry is realized by Sr2GdTaO6: Eu3+,Mn4+ phosphors.•The maximum relatively sensitivity is 2.61% K−1.•The Sr2GdTaO6: Eu3+,Mn4+ phosphors exhibit excellent temperature resolution. To further enhance the temperature measurement performance of optical thermometers, Sr2GdTaO6:Eu3+,Mn4+ double perovskite phosphors were designed. The structure, morphology, photoluminescent performance, and temperature sensing capabilities of Sr2GdTaO6:Eu3+,Mn4+ were thoroughly analyzed. Using the temperature response characteristics of Eu3+ and Mn4+ luminescent centers, four temperature measurement modes were developed, including temperature-dependent fluorescence intensity of Mn4+, fluorescence lifetime of Mn4+, fluorescence intensity ratio of Eu3+ and Mn4+, and excitation intensity ratio between Eu3+–O2− charge transfer band and Eu3+. Their maximum relative sensitivity are 1.85 %K−1 (414 K), 1.88 %K−1 (469 K), 2.61 %K−1 (422 K) and 1.52 %K−1 (573 K), respectively. The temperature range of each temperature measurement mode is 303 − 483 K, 303 − 483 K, 303 − 483 K and 303 − 573 K. These outcomes indicate that Sr2GdTaO6:Eu3+,Mn4+ double perovskite phosphors are promising four-mode optical temperature measurement materials.