Photo-induced charge state conversion of Eu~(2+) in Ca_(2)ZnSi_(2)O_(7)

Hayato Kamioka; Masahiro Hirano; Hideo Hosono

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Photo-induced charge state conversion of Eu~(2+) in Ca_(2)ZnSi_(2)O_(7)

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Eu~(2+) doped sorosilicate Ca_(2)ZnSi_(2)O_(7) (melilite) exhibits a broad band emission peaking at approx600 nm (approx2 eV) due to the electric dipole allowed transition of 4f~(6)5d~(1) to 4f~(7) of Eu~(2+) by an excitation with blue light (460 nm). Strong O~(2-) ligand field with low symmetry due to the layered tetragonal crystallographic structure of the melilite may play a dominant role in lowering the emission band energy to approx2 eV. In addition, line emissions attributable to the transitions from ~(5)D_(0) to ~(7)F_(J) of Eu~(3+) ions are detected by an excitation with deep UV light with sub-360 nm wavelengths. This is due to the formation of transient Eu~(3+) ions via charge transfer from Eu~(2+) to the matrix. The lifetime of the transient Eu~(3+) ion is found to be 58 ms by a pump-probe measurement, in which UV pulse laser and green continuous wave laser are employed as pump and probe lights, respectively. Based on these results, the energy diagram of Eu~(2+) in Ca_(2)ZnSi_(2)O_(7) is proposed.

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《Journal of Applied Physics》 |2009年第5期|053105-1-053105-7|共7页
作者
Hayato Kamioka; Masahiro Hirano; Hideo Hosono;
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作者单位

Graduate School of Pure and Applied Sciences, University of Tsukuba, Ten-noudai 1-1-1, Tsukuba, Ibaraki 305-8571, Japan;

Transparent Electro-Active Materials Project, ERATO-SORST, Japan Science and Technology, Bldg. S2-6F East, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama 226-8503, Japan;

Materials and Structures Laboratory, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama 226-8503, Japan;

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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
原文格式 PDF
正文语种英语
中图分类应用物理学;
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Photo-induced charge state conversion of Eu~(2+) in Ca_(2)ZnSi_(2)O_(7)

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