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Luminescence of rare-earth ions in perovskite-type oxides: from basic research to applications |
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| Authors: | Haijme Yamamoto Shinji Okamoto Hiroshi Kobayashi |
| Institution: | a Faculty of Engineering, Tokyo University of Technology, 1404-1, Katakura, Hachioji, Tokyo 192-0982, Japan b Faculty of Engineering, Department of Electrical and Electronic Engineering, Tottori University, Koyama, Tottori 680-8552, Japan |
| Abstract: | Luminescence of a rare-earth ion in SrTiO3 or other perovskite-type oxides was used as a probe of physical properties of a host crystal, but not as a phosphor because observed luminescence efficiency was low. Recent investigations have shown that the luminescence efficiency of SrTiO3:Pr3+ is intensified up to 200 times by addition of Al ions. This paper reviews experimental results on this phenomenon and discusses mechanism of the Al-addition effect. A survey was made to find other materials, the efficiency of which can be improved by the impurity addition. Host-to-activator energy transfer by a coupling of the band-edge recombination energy and an allowed transition of a rare-earth ion is essential to provide a high efficiency. A red phosphor, Al-added SrTiO3:Pr3+, is promising for display applications. |
| Keywords: | Strontium titanate Luminescence efficiency Energy transfer and rare-earth ions |
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