Growth arid properties of long-lasting phosphors stored with solar energy

太阳能储存的长效荧光粉的生长和特性

• 批准号: 14550037
• 负责人: YAMAGA Mitsuo
• 金额: $ 2.24万
• 依托单位: Gifu University2002
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2002
• 资助国家: 日本
• 起止时间: 2002 至 2003
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-14550037/
• 关键词: long-lasting phosphorescence; Optical energy storage materials; Barium silicate crystals; Rare earth ions; Europium ions; electron-hole recombination; Self-trapped holes; Color centers; 長残光; バリウムケイ酸塩結晶; メリライト結晶

UV or visible excitation for Eu^<2+:>Ba_2SiO_4 and Eu^<2+:>\Bs_3SiO_5 crystals produces broadband luminescence with peak wavelengths of 510 and 590 nm, respectively. The intensities of the long-lasting phosphorescence were measured as functions of temperature and time. The radiative decay times are distributed in the wide range of 1-10^3 seconds besides the Eu^<2+> fluorescence lifetime of 10^6 seconds. The decay curves above one second in the temperature range of 100-500 K fit t^n(n〜1). The temperature dependence of the long-lasting phosphorescene intensities integrated, in a time domain. obeys the modified Arrhenius's equation. with thermal activation energies including radiative and nonradiative decay processes. These results suggest that electrons and holes produced by UV or visible excitation move back to Eu2+ sites in the crystals through thermal hopping and/or tunneling and recombine radiatively at Eu^<2+>.

Eu^<2+:>Ba_2SiO_4 和 Eu^<2+:>\Bs_3SiO_5 晶体的紫外或可见光激发分别产生峰值波长为 510 和 590 nm 的宽带发光。测量了持久磷光的强度作为温度和时间的函数。除Eu^2+荧光寿命为10^6秒外，辐射衰减时间分布在1-10^3秒的较宽范围内。在100-500 K温度范围内1秒以上的衰减曲线符合t^n(n〜1)。时域内积分的长效磷光强度的温度依赖性。服从修正的阿伦尼乌斯方程。具有热活化能，包括辐射和非辐射衰变过程。这些结果表明，由UV或可见光激发产生的电子和空穴通过热跳跃和/或隧道效应移回晶体中的Eu 2+ 位点，并在Eu 2+ 处辐射复合。

项目成果

Mitsuo Yamaga, Yoshifumi Tani, Nobuhiro Kodama, Tomoko Takahashi, Makoto Honda: "Mechanism of long-lasting phosphorescence process of Ce^<3+>-doped Ca_2Al_2SiO_7 melilite crystals"Physical Review B. Vol.65. 1-11 (2002)

Mitsuo Yamaga、Yoshifumi Tani、Nobuhiro Kodama、Tomoko Takahashi、Makoto Honda：“Ce^<3>掺杂Ca_2Al_2SiO_7黄长石晶体的持久磷光过程的机制”Physical Review B. Vol.65。

M.Yamaga他8名: "Optical, infrared and EPR spectroscopy of CaF_2:Ce^<3+> crystals co-doped with Li^+ or Na^+"Journal Luminescence. 108. 307-311 (2004)

M. Yamaga 等 8 人：“CaF_2:Ce^3+ 晶体与 Li^+ 或 Na^+ 共掺杂的光学、红外和 EPR 光谱”《发光杂志》108. 307-311 (2004)

M.Yamaga, T.Inoue, S.Yabashi, et al.: "Site symmetry and crystal field splittings of Ce^<3+> in LiLuF_4 and LiSr_<0.8>Ca_<0.2>AlF_6"Radiation Effects and Defects in Solids. 157. 977-982 (2002)

M.Yamaga、T.Inoue、S.Yabashi 等人：“LiLuF_4 和 LiSr_<0.8>Ca_<0.2>AlF_6 中 Ce^<3> 的位点对称性和晶体场分裂”固体中的辐射效应和缺陷。

Mitsuo Yamaga, J.-P.R.Wells, M.Honda, T.P.J.Han, B.Henderson: "Investigation on the valence of Cr ions in LiAlO_2"Journal Luminescence. Vol.108. 313-317 (2004)

Mitsuo Yamaga、J.-P.R.Wells、M.Honda、T.P.J.Han、B.Henderson：“LiAlO_2 中 Cr 离子价态的研究”期刊发光。

Mitsuo Yamaga, Nobubiro Kodania: "Mechanism of Long-lasting Phosphorescence in Rare-earth Doped Oxides"Material Integration-Electronic Ceramics-. Vol.17. 31-35 (2004)

Mitsuo Yamaga、Nobubiro Kodania：“稀土掺杂氧化物中长效磷光的机制”材料集成-电子陶瓷-。