Articles
  • Enhanced photoluminescence from KCl flux assisted Eu3+ doped CaTiO3 red phosphor for temperature sensing

  • Xiuying Tiana,*, Lei Lia, Mengyuan Weia, Changyan Jia, Zhi Huangb, Xin Liua, Jin Wena, and Yangxi Penga

  • aHunan Provincial Key Laboratory of Fine Ceramics and Powder Materials, School of Materials and Environmental Engineering, Hunan University of Humanities, Science and Technology, Loudi,417000, China
    bNational Electronic Ceramic Product Quality Supervision and Inspection Center, Loudi, Hunan, 417000, China

  • This article is an open access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

CaTiO3: Eu3+ red phosphors with high thermal stability and temperature sensitivity were synthesized by KCl flux assisted solid phase reaction method and they had orthorhombic perovskite phase. CaTiO3:15%Eu3+ had the irregular particle structure, with mean particle size of about 1.58 μm, while CaTiO3:15%Eu3+ +6%KCl also had the irregular particle structure, with mean particle size of about 2.25 μm. When Eu3+ ion concentration was 15mol%, concentration quenching phenomenon took place, which could be explained by electric dipole-dipole interaction due to the critical Eu3+- Eu3+ distance of ~ 8.93 Å. We found that KCl flux could increase the particle size and crystallinity, which was beneficial to luminescence property. Based on the PL spectra excited at 398 nm, the color coordinates of CaTiO3:15%Eu3+ were (0.5911, 0.4008) and the color purity was 97.7%, while the color coordinates of sample CaTiO3:15%Eu3++ 6%KCl were (0.6042, 0.3895) and the color purity was 98.4%. The relative intensity IR1 and IR2 at 423 K is 87. 29% and 83. 22%, indicating the sample had high thermal stability. Based on TCLs FIR, Sr of CaTiO3:15%Eu3+ is 2322.67/T2. CaTiO3:Eu3+ red phosphor was expected to be a promising inorganic material for possible applications in temperature sensing


Keywords: Flux, optical thermometry, solid state reaction, calcium titanate, europium

This Article

  • 2021; 22(5): 555-567

    Published on Oct 31, 2021

  • 10.36410/jcpr.2021.22.5.555
  • Received on Feb 28, 2021
  • Revised on May 10, 2021
  • Accepted on May 14, 2021

Correspondence to

  • Xiuying Tian

  • Hunan Provincial Key Laboratory of Fine Ceramics and Powder Materials, School of Materials and Environmental Engineering, Hunan University of Humanities, Science and Technology, Loudi,417000, China
    Tel : +86-0738-8325065 Fax: +86-0738-8326910

  • E-mail: xiuyingt@yahoo.com