Comparison between the photoluminescence Properties of LaPO_4 : Tb, Ce Phosphor under 254nm Excitation and those under 365nm Excitation

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概要

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• LaPO_4 : Tb, Ce phosphors have been used for the green component of three-band emission type fluorescent lamps.We have confirmed that the emission intensity of Tb^<3+> under 254nm excitation is greatly enhanced by the energy transfer from Ce to Tb in the case of Ce co-doping, and the fluorescent intensity-temperature characteristics were also improved by substituting borate for a small part of phosphate, or by additive doping with thorium.In order to apply this phosphors to high pressure mercury lamps which operate at higher wall temperature and loading than low pressure mercury lamps, some characteristics of this phosphors under 365nm excitation were investigated. However, the green emission intensity under 365nm excitation was rather decreased by doping with cerium. The reason for this phenomenon could possibly be caused to energy transfer from Tb^<3+> to Ce^<3+>, as excitation spectra of Tb^<3+> and emission spectra of Ce^<3+> overlap each other.Time-resolved spectra have been also observed under 365nm dye laser excitation. The ^5D_3 --> ^7F_j emission were found in highly Tb-doped LaPO_4 : Tb, Ce phosphors, and new line emissions around 600nm which are considered to be originated by Ce^<2+> were found in (La, Ce, Th)(PO_4,BO_3) : Tb phosphors under 365nm pulse excitation.

• 社団法人照明学会の論文

著者

• HATAYAMA Tomoaki

  Graduate School of Materials Science, Nara Institute of Science and Technology

• IBUKI Sumiaki

  Faculty of Engineering, Setsunan University

• Noguchi T

  Faculty Of Engineering Setsunan Univercity

• Hayashi Yasufumi

  Faculty Of Engineering Setsunan Univercity

• Noguchi T

  Department Of Architecture Faculty Of Engineering Kansai University

• Ibuki S

  Faculty Of Engineering Setsunan Univercity

• Ibuki Sumiaki

  Faculty Of Engineering Setsunan University

• FUKUMOTO Shigeru

  Faculty of Engineering, Setsunan Univercity

• NOGUCHI Tohru

  Faculty of Engineering, Setsunan Univercity

• Hatayama T

  Ion Engineering Res. Inst. Corp. Osaka Jpn

• Hatayama Tomoaki

  Graduate School Of Materials Science Nara Institute Of Science And Technology

• Fukumoto Shigeru

  Faculty Of Engineering Setsunan Univercity

• Hatayama Tomoaki

  Graduate School of Engineering, Kyoto Univercity

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