2013 Fiscal Year Final Research Report
Construction of photoconductivity measurement system and studies on excited states and electronic structure of phosphors
| Project/Area Number |
23350099
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Inorganic industrial materials
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| Research Institution | Kyoto University |
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Principal Investigator |
TANABE Setsuhisa 京都大学, 人間・環境学研究科(研究院), 教授 (20222119)
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| Co-Investigator(Renkei-kenkyūsha) |
UEDA Jumpei 京都大学, 地球環境学堂, 助教 (90633181)
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| Project Period (FY) |
2011-04-01 – 2014-03-31
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| Keywords | 蛍光体 / 電子物性 / 光伝導度 / 希土類 / 電子構造 / 励起状態 / 伝導帯 |
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| Research Abstract |
In order to clarify the nonradiative process that dominates luminescence quantum efficiency of inorganic phosphor materials, we have developed a photoconductivity measurement system as functions of temperature and irradiating wavelength. Attention was paid on rare-earth doped phosphor materials for white LED, where 4f-5d electronic transition plays important role. By measurement of temperature dependence of photocurrent excitation spectra, the energy relation of Ce3+:5d level and conduction band of host was investigated for garnet ceramic phosphors of various compositions. A photo-ionization process of excited 5d electrons was found to be a quenching mechanisms at higher temperatures.
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