Dual-mode optical thermometry based on Bi3+/Eu3+ co-activated BaGd2O4 phosphor with high sensitivity and signal discriminability. Issue 21 (1st November 2021)

• Record Type: Journal Article
• Authors: Fu, Jie; Liu, Fuwen; Zhou, Liuyan; Ye, Renguang; Deng, Degang; Xu, Shiqing
• Is Part Of: Ceramics international. Volume 47:Issue 21(2021)
• Page Start: 30221
• Page End: 30233
• Publication Date: 2021-11-01
• Subjects: BaGd2O4 -- Luminescence performance -- FIR -- Non-contact optical temperature measurement; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2021.07.202
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: A series of BaGd2 O4 :Bi 3+, Eu 3+ phosphors with dual-emitting centers were prepared by high-temperature solid-state method. X-ray diffraction (XRD), scanning electron microscope (SEM), energy dispersive spectroscopy (EDS), fluorescence spectroscopy, lifetime decay curve and variable temperature emission spectroscopy were used to systematically study the structure, luminescence performance and temperature characteristics. Under ultraviolet (UV) excitation, the BaGd2 O4 :Bi 3+, Eu 3+ phosphor showed a broad-band emission in the blue region corresponding to transitions of Bi 3+ ions and the sharp red light emission corresponding to Eu 3+ ions. The Bi 3+ and Eu 3+ ion emission peaks were well-separated, which meets a prerequisite for efficient temperature signal resolution measurement. The fluorescence intensity ratio (FIR) technique was used to measure the different temperature response characteristics between Bi 3+ blue emission and Eu 3+ red emission. When the temperature varies from 293 K to 473 K, the relative temperature sensitivity ( S r ) of BaGd2 O4 :Bi 3+, Eu 3+ phosphors is obtained, was determined as 1.0182%K −1 . In addition to calculating the relative sensitivity by FIR technology, we can also obtain the value of S r through experiments and formulas related to the decay life, and found to be 1.0651%K −1 . Therefore, BaGd2 O4 : Bi 3+, Eu 3+ phosphor is an excellent non-contact optical temperature measurement material.