Multifunctional optical thermometry based on the transition metal ions doped down-conversion Gd2ZnTiO6: Bi3+, Mn4+ phosphors

• Published in: Journal of luminescence 2021-01, Vol.229, p.117653, Article 117653
• Main Authors: Zhang, Mingxuan, Jia, Mochen, Sheng, Tianqi, Fu, Zuoling
• Format: Article
• Language: English
• Subjects: Down-conversion luminescence; LEDs; Plant cultivation; Temperature sensing
• ISSN: 0022-2313; 1872-7883
• DOI: 10.1016/j.jlumin.2020.117653

Nowadays, how to improve the accuracy of the temperature sensors has become a common concern of researchers. For this purpose, dual-emitting phosphors have been proposed as a novel optical thermometer because the two discriminate emission centers can avoid the error caused by spectral overlap. Herein, a new ratio-metric luminescent thermometer Gd2ZnTiO6(GZTO):Bi3+, Mn4+ is designed, which exhibits both red and blue luminescence under 375 nm excitation. Based on the different thermal sensitivity of Mn4+ and Bi3+ ions and the energy transfer from Bi3+ to Mn4+ ions, the luminescent thermometer reveals excellent thermal sensitivity (Sr = 2.4% K−1, Sa = 16.8%K−1) and a wide temperature measurement range (313–473 K). Both of them are superior to the most reported materials. In addition, the luminescence intensity of two ions matches the light absorption bands of photosynthetic pigment well, which indicates that GZTO: Bi3+, Mn4+ phosphors also have a great prospect as a plant growth lamp. Based on the different thermal sensitivity of Mn4+ and Bi3+ ions and the energy transfer from Bi3+ to Mn4+ ions, the thermometer Gd2ZnTiO6:Mn4+,Bi3+ designed by us reveals excellent thermal sensitivity. The luminescence of thermometer which fits the light absorption bands of photosynthetic pigment well is strong enough to have a great application prospect for plant growth lamp. [Display omitted] •A novel thermometer Gd2ZnTiO6: Bi3+, Mn4+ is designed with high sensitivity.•The energy transfer process from Bi3+ to Mn4+ is realized in Gd2ZnTiO6.•The luminescence of phosphors is strong enough to make LED chips.•The luminescence of phosphors can be well absorbed by photosynthetic pigments.