Photoluminescence and Thermoluminescence of MgSO_4, CaSO_4, SrSO_4 and BaSO_4 Powder Phosphors Activated with Tb^<3+> : Semiconductors

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概要

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• The photoluminescence (PL) spectra and optical excitation spectra of phosphors were obtained at temperatures of 10, 80, 300 and 370K. Many narrow bands were observed in both the spectra, and were attributed to the transitions within the 4f^8 electron configuration in Tb^<3+> The quenching of the 5D_3 emission series assigned to the transitions ^5D_3 → ^7F_J (J=6, 5, 4, 3, 2, 1 and 0) is characteristic of the PL emission spectra. The thermoluminescence (TL) glow curves, TL emission Spectra and TL fading properties of the same samples were also observed. The quenching of the ^5D_3 emission series is not observed in the TL emission spectra. The large differences between the features of the TL emission spectrum and the PL emission spectrum are contradictory to the conventional model of the TL emission process. The addition of Na^+ to the phosphors as a charge compensator is effective in enhancing the PL efficiency, but causes TL fading because of the shallow electron traps due to Na^+.

• 社団法人応用物理学会の論文
• 2001-12-15

著者

• TAKADA Makoto

  Faculty of Engineering and Resource Science, Akita University

• Yamashita Nobuhiko

  Faculty of Education, Okayama University

• Nakagawa Masuo

  Faculty of Science, Okayama University of Science

• Nakagawa Masuo

  Faculty Of Science Okayama University Of Science

• HAMADA Takuya

  Faculty of Education, Okayama University

• KATSUKI Masafumi

  Faculty of Science, Okayama University of Science

• Yamashita Nobuhiko

  Faculty Of Education Okayama University

• Hamada Takuya

  Faculty Of Education Okayama University

• Katsuki Masafumi

  Faculty Of Science Okayama University Of Science

• Takada Makoto

  Faculty Of Education Okayama University

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