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Study on Fabrication of Intense Fluorescent Oxides doped with Rare Earths

稀土掺杂强荧光氧化物的制备研究

基本信息

批准号：
05453073
负责人：
SHIMADA Masahiko
金额：
$ 5.25万
依托单位：
TOHOKU UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (B)
财政年份：
1993
资助国家：
日本
起止时间：
1993 至 1994
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-05453073/
关键词：
Tantalates Intense emission Blue luminescence Green luminescence Red luminescence Energy migration Fluorescent rare earth solid solution oxides 希土類固溶蛍光体

项目摘要

Fluorescent Oxides doped with rare earths such as Tm^<3+>, Tb^<3+> and Eu^<3+> have attracted much attention because of their blue, green and red luminescence. However, an enriched quantity of rare earths frequently leads to a quenching phenomenon in luminescence owing to the energy transfer between rare earth ions i. e. concentration quenching. It is important to elucidate the quenching mechanism in oxides in order to realize intense fluorescence. In the present study, the luminescence properties of Tm^<3+>, Tb^<3+> and Eu^<3+> in (La_<1-X>R_X) Ta_7O_<19> (R=Tm, Tb, Eu) solid solutions were examined systematically. X-ray diffraction patterns of the solid solutions indicated wat the crystal structure consisted of a network of (La^<3+>_<1-X>R^<3+>_X, Ta^<5+>)-O^<2-> polyhedra interstratified with a double layr of Ta^<5+> -O^<2-> polyhedra. According to the emission spectra, the most intense emissions were found near 460nm and X=0.14 in (La_<1-X>Tb_X) Ta_7 O_<19>, near 547nm and X=0.8 IN (La_<1-X> Tb_X) Ta_7O_<19>, near 610nm and X=1.0 in (La_<1-X>Eu_X)Ta_7O_<19>. As a results, a low dimensional arrangement of Tm^<3+>, Tb^<3+> or Eu^<3+> was much more preferable for getting intense emission, because it reduced the energy migration between rare earth ions in (La_<1-X>R_X) Ta_7O_<19> solid solutions.

稀土掺杂的荧光氧化物，如Tm^<3+>、Tb^<3+>和Eu^<3+>等，因其蓝色、绿色和红色的发光特性而备受关注。然而，当稀土元素的富集量较大时，由于稀土离子之间的能量传递，往往会导致发光发生猝灭现象，即浓度猝灭。阐明氧化物的猝灭机理是实现强荧光的重要手段。本文研究了Tm <3+>、Tb <3+>和Eu <3+>在（La_<1-X>R_X） Ta_7O_<19> （R=Tm、Tb、Eu）固溶体中的发光特性。固溶体的x射线衍射图表明，晶体结构由La^<3+>_<1-X>R^<3+>_X, Ta^<5+>)- o ^<2->多面体和Ta^<5+> - o ^<2->多面体组成。在460nm附近，X=0.14 in (La_<1-X>Tb_X) Ta_7O_<19>；在547nm附近，X=0.8 in (La_<1-X>Tb_X) Ta_7O_<19>；在610nm附近，X=1.0 in (La_<1-X>Eu_X)Ta_7O_<19>。结果表明，在（La_<1-X>R_X） Ta_7O_<19>固溶体中，Tm^<3+>、Tb^<3+>或Eu^<3+>的低维排列方式降低了稀土离子之间的能量迁移，更有利于获得强发射。