| Project/Area Number |
25800180
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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 |
Condensed matter physics I
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| Research Institution | Sophia University |
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Principal Investigator |
INOSE Yuta 上智大学, 理工学部, 研究員 (90634501)
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| Project Period (FY) |
2013-04-01 – 2016-03-31
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| Project Status |
Completed (Fiscal Year 2015)
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| Budget Amount *help |
¥3,640,000 (Direct Cost: ¥2,800,000、Indirect Cost: ¥840,000)
Fiscal Year 2015: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2014: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2013: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
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| Keywords | 窒化物半導体 / キャリアダイナミクス / 量子効率 / 取り出し効率 / 励起子‐フォノン相互作用 / 励起子多体効果 / 誘導放出 / ランダムレージング / 発光メカニズム / 発光効率 / オージェ効果 / 分布帰還型レーザー / ディラックコーン / 光局在 |
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| Outline of Final Research Achievements |
We have researched optical properties of nano-sized nitride columnar semiconductors and demonstrated three items as described below.
(1) Both of internal quantum efficiency and light extraction efficiency of the nano crystals are higher than those of film samples, then nanocolumns show very high external quantum efficiency. (2) We estimated depth of localized states for InGaN/GaN samples, and defined a clear relationship between the depth and the emission efficiency. We measured additionally crystal size dependence of GaN nanocolumns, and we found nano-size effects in the exciton-phonon interaction. (3) We detected stimulated emission via an array of the nano crystals, and observed directly the oscillation mechanism through time-resolved spectroscopy, real spatial images, and wavenumber spatial images. Furthermore, we evinced the influence of structural fluctuation on the column arrays.
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