| Budget Amount *help |
¥50,700,000 (Direct Cost: ¥39,000,000、Indirect Cost: ¥11,700,000)
Fiscal Year 2020: ¥6,890,000 (Direct Cost: ¥5,300,000、Indirect Cost: ¥1,590,000)
Fiscal Year 2019: ¥9,620,000 (Direct Cost: ¥7,400,000、Indirect Cost: ¥2,220,000)
Fiscal Year 2018: ¥10,530,000 (Direct Cost: ¥8,100,000、Indirect Cost: ¥2,430,000)
Fiscal Year 2017: ¥11,050,000 (Direct Cost: ¥8,500,000、Indirect Cost: ¥2,550,000)
Fiscal Year 2016: ¥12,610,000 (Direct Cost: ¥9,700,000、Indirect Cost: ¥2,910,000)
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| Outline of Final Research Achievements |
We have clarified the huge binding energy of biexcitons in AlGaN-based quantum wells by means of photoluminescence excitation spectroscopy in the deep ultraviolet spectral range. We successfully evaluated the effect of localization on the biexciton binding energy separately from the effect of quantum confinement. In addition, we observed deep ultraviolet stimulated emission on the higher-energy side of spontaneous emission by optical pumping. Based on the temperature dependence of the threshold excitation carrier density for stimulated emission, we clarified that the formation of optical gain was excitonic in origin even at room temperature.
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