2013 Fiscal Year Final Research Report
Research and development of oxide phosphor with low cost and nontoxic elements
| Project/Area Number |
23560797
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Inorganic materials/Physical properties
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| Research Institution | Utsunomiya University |
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Principal Investigator |
SHAN Yue Jin 宇都宮大学, 工学(系)研究科(研究院), 教授 (20272221)
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| Co-Investigator(Kenkyū-buntansha) |
IMOTO Hideo 宇都宮大学, その他部局等, 教授 (20168529)
TEZUKA Keitaro 宇都宮大学, 工学研究科, 助教 (00334079)
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| Project Period (FY) |
2011 – 2013
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| Keywords | アルミナ蛍光体 / 光ルミネセンス / 溶液法 / カーボン不純物 / 酸素欠陥 |
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| Research Abstract |
The amorphous alumina phosphors without containing expensive or toxic elements were prepared via solution method. The obtained sample indicates bluish-white emission centered in 390-430 nm by UV excitation. According to the measurement results of Electron Spin Resonance (ESR), Fourier Transform Infrared Spectroscopy (FT-IR) and organic microanalysis, it is found that the carbon impurities exist in the sample and they are essential for luminescence. On the other hand, there is a good correspondence among the excitation spectra of the emission samples, the experimental optical properties of amorphous alumina, and the calculated oxygen vacancies levels in amorphous alumina model. Therefore, the new luminescence mechanism can be proposed as follows; the electrons in valence band are excited to oxygen vacancies bands by UV light and return to ground state through the carbon impurities band, being accompanied by the bluish-white emission.
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