| Project/Area Number |
17K14806
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Multi-year Fund |
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| Research Field |
Inorganic materials/Physical properties
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| Research Institution | Tohoku University |
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Principal Investigator |
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| Project Period (FY) |
2017-04-01 – 2019-03-31
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| Project Status |
Completed (Fiscal Year 2018)
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| Budget Amount *help |
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2018: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
Fiscal Year 2017: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
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| Keywords | 蛍光体 / 薄膜 / 紫外光励起 / 酸化亜鉛 / タングステン / バナジウム / 青色 / スパッタリング / ナノ材料 / 機能性セラミックス材料 |
|---|
| Outline of Final Research Achievements |
Fabrication process of rare-earth-free ZnO-based phosphor films and their stacked structure was investigated. W-Zn-O blue phosphor films (hereafter 'WZO') exhibited high quantum efficiency when it is mostly consisted of zinc tungstate but not tungsten oxide. Higher quantum efficiency was exhibited in stacked film of WZO and zinc vanadate when thermally oxidized layer-by-layer despite of stacked order.
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| Academic Significance and Societal Importance of the Research Achievements |
これまで蛍光体波長変換型白色LEDの多くは封止樹脂中に粉体状の蛍光体を分散固定していた。この樹脂はLEDの熱によって劣化・変性し、変色や光取り出し効率の低下を招いている。本研究成果は蛍光体自身と多色混合に固定材料を要しないだけでなく、急速熱酸化処理に基づく高速薄膜形成プロセスを採用しており、蛍光体の生産プロセスを短縮化し、省エネルギー化にも資するものである。
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