Luminescence properties and thermometric performance of Bi3+/Sm3+-codoped BaLa2ZnO5 phosphors

• Published in: Ceramics international 2023-05, Vol.49 (10), p.15229-15236
• Main Authors: Song, Jiamei, Zhang, Xinyu, Huang, Ninglei, Dou, Hongjian, Chen, Bo, Tian, Xiuna, Wang, Changjun, Wu, Lingyuan
• Format: Article
• Language: English
• Subjects: BaLa2ZnO5: Bi3; Luminescence; s2 electronic configuration; Temperature sensing
• ISSN: 0272-8842
• DOI: 10.1016/j.ceramint.2023.01.105

A zincate material, BaLa2ZnO5 was successfully synthesized by a high-temperature solid-state method as a host for Bi3+. All the peaks in the X-ray diffraction patterns of the obtained material could be attributed to single phase BaLa2ZnO5. The BaLa2ZnO5 host exhibited strong band-to-band absorption in the range of 200–290 nm. After the doping of Bi3+, the absorption band due to band-to-band transition decreased, and three new absorption bands appeared. Upon monitoring the luminescence of Bi3+ at 407 nm, three excitation peaks were observed for BaLa2ZnO5: Bi3+, which could be attributed to A, C and metal-to-metal charge-transfer states by analyzing its excitation and absorption spectra. When codoped with Bi3+ and Sm3+, BaLa2ZnO5: Bi3+/Sm3+ exhibited strong energy transfer process from Bi3+ to Sm3+. Variable-temperature emission spectra revealed that the luminescence intensity of Bi3+ decreases rapidly with the increase in temperature, while that of Sm3+ ions decreases slowly. The relative sensitivity (SR) values of the BaLa2ZnO5: Bi3+ and BaLa2ZnO5: Bi3+/Sm3+ phosphors to temperature (1.77 and 1.12% K−1, respectively) were high and extremely stable in the range of 293–423 K. Therefore, the Bi3+-doped BaLa2ZnO5 phosphor has great application potential for biological temperature sensing.