Dual-mode optical thermometer based on fluorescence intensity ratio of Eu3+/Mn4+ co-doping zinc titanate phosphors

• Published in: Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy Molecular and biomolecular spectroscopy, 2023-03, Vol.288, p.122127, Article 122127
• Main Authors: Hu, Fengya, Ren, Shiqi, Wu, Yongjin, Sun, Chengmei, Zhu, Bingjun, Wang, Qingru, Li, Shuhong, Zhang, Dong
• Format: Article
• Language: English
• Subjects: Dual-mode emissions; Optical thermometry; Rare earth; Zinc titanate
• ISSN: 1386-1425
• DOI: 10.1016/j.saa.2022.122127

[Display omitted] •Dual emissions in Mn4+/ Eu3+codoped zinc titanatephosphors are achieved.•Dual-mode optical temperature sensing is realized via activator selection.•ZTO: Mn4+, Eu3+phosphor can be used as an excellent opticalthermometer. Zinc titanate phosphors containing Eu3+/ Mn4+ as active ions were synthesized by using the solid-state method. XRD patterns of the powders confirmed that the samples were a mixture of cubic Zn2TiO4 and hexagonal ZnTiO3 phases. The luminous intensity of ZTO: Eu3+phosphors and ZTO: Mn4+ phosphors both increased with the increase of doping concentration, reaching the maximum at 2 mol% Eu3+ and 0.3 mol% Mn4+, respectively. In the photoluminescence spectra of ZTO: Eu3+(2 mol%) phosphors with different Mn4+ doping amounts excited at 465 nm, the emission spectra revealed the characteristic peaks of Eu3+ with low Mn4+ content, and with the Mn4+ content increasing, the emission spectra contained both Mn4+ and Eu3+ luminescence peaks. In the variable temperature spectra, the relative sensitivity of the samples was improved with the concentration of Mn4+ increasing and achieved the maximum value of 3.2 %/K.