2015 Fiscal Year Final Research Report
Luminescence Microscope for Detecting Energy Distribution of Non-Radiative Recombination Centers
| Project/Area Number |
25600087
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| Research Category |
Grant-in-Aid for Challenging Exploratory Research
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| Allocation Type | Multi-year Fund |
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| Research Field |
Crystal engineering
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| Research Institution | Saitama University |
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Principal Investigator |
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| Co-Investigator(Renkei-kenkyūsha) |
ISLAM Touhidul 埼玉大学, 理工学研究科, 研究員 (90646358)
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| Project Period (FY) |
2013-04-01 – 2016-03-31
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| Keywords | フォトルミネッセンス / 非発光再結合準位 / 光学評価 / 結晶工学 / 禁制帯内励起 |
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| Outline of Final Research Achievements |
It is inevitable to detect non-radiative recombination (NRR) centers which deteriorate quantum efficiency and lifetime of light emitting materials and devices, clarify their origins and eliminate them. NRR centers have been detected and characterized by non-contacting and non-destractive method utilizing a below-gap excitation (BGE) light and observing the photoluminescence (PL) intensity change. The BGE light sources were supplemented by adding a Xe lamp stabilized by a laser diode, and two-wavelength excited PL measurements were carried out for GaN, GaPN and phosphor materials.
As a result, it became possible to exemplify directly that the yellow luminescence band in GaN corresponds to the transition between a shallow donor to a deep level about 1eV above the valence band. It is also shown that two NRR centers above and below the intermediate band exist in GaPN with N concentration of 0.56%.
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| Free Research Field |
光物性工学
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