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      저자 : Changyan Ji (검색결과 2 건)
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      • KCI등재

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

        Xiuying Tian,Lei Li,Mengyuan Wei,Changyan Ji,Zhi Huang,Xin Liu,Jin Wen,Yangxi Peng 한양대학교 세라믹연구소 2021 Journal of Ceramic Processing Research Vol.22 No.5

        CaTiO3: Eu3+ red phosphors with high thermal stability and temperature sensitivity were synthesized by KCl flux assisted solidphase 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 meanparticle 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 thatKCl flux could increase the particle size and crystallinity, which was beneficial to luminescence property. Based on the PLspectra 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%. Therelative intensity IR1 and IR2 at 423 K is 87. 29% and 83. 22%, indicating the sample had high thermal stability. Based on TCLsFIR, Sr of CaTiO3:15%Eu3+ is 2322.67/T^2. CaTiO3:Eu3+ red phosphor was expected to be a promising inorganic material forpossible applications in temperature sensing.

      • KCI등재

        KCl flux-assisted CaTiO3: Pr3+ red phosphors for temperature sensing

        Xin Liu,Xiuying Tian,Huiyan Sheng,Changyan Ji,Zhi Huang,Jin Wen,Hongxia Peng,Ling Zhu,Jing Li,Ping Liu,Yangxi Peng,Guowen Li 한양대학교 청정에너지연구소 2024 Journal of Ceramic Processing Research Vol.25 No.2

        The red CaTiO3: Pr3+ phosphors were fabricated by employing a solid-state method using KCl flux, and investigated fortemperature sensing. There were no structural changes observed with increasing KCl concentration, and no impuritieswere detected. The obtained crystal structure was identified as an orthorhombic perovskite, belonging to space group ofPnma(62). The typical sample exhibited spherical particles (1-2 μm). The optical bandgap of the sample was measured to beapproximately 3.62 eV. Notably, when the KCl concentration reached 3%, the sample exhibited the highest photoluminescenceintensity, indicating excellent crystallization strength. They closely resembled the chromaticity coordinates of ideal red lightbased on CIE chromaticity diagram, and the color purity was determined to be 79.51%. Furthermore, the absolute sensitivity(Sa) was approximately as high as 0.148 K-1, while the relative sensitivity (Sr) reached approximately a high value of 6.57% K-1,which highlights the significant potential of optical thermometry.

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