説明
In Ce3+–Yb3+ co-doped Y3Al5O12 (YAG) ceramics, possibility of quantum cutting mechanism converting one visible photon into two NIR photons with optimum quantum efficiency approaching 200% have been investigated. In this material, Yb3+ emissions due to the 2F5/2-2F7/2 in the range of 1 μm were observed upon the excitation of 5d level of Ce3+. In addition, excitation spectra of Yb3+ emission corresponded to that of Ce3+ emission completely. Lifetime of the 5d level of Ce3+ decreased with increasing Yb3+ content. These results indicate the energy transfer (ET) from the 5d levels of Ce3+ to the 5F5/2 level of Yb3+. In (Y0.945Ce0.005Yb0.05) 3Al5O12 sample, the directly measured quantum yield (QY) of Yb3+ emission upon the excitation of 5d level of Ce3+ was about 12% and lower than QY (96%) that estimated from the ET efficiency which was calculated with the measured lifetime of Ce3+.
収録刊行物
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- Journal of Applied Physics
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Journal of Applied Physics 106 (4), 43101-, 2009-08-17
American Institute of Physics
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詳細情報 詳細情報について
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- CRID
- 1573668926267745280
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- NII論文ID
- 80020535938
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- ISSN
- 00218979
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- Web Site
- http://hdl.handle.net/2433/150457
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- 本文言語コード
- en
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- データソース種別
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