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用分子束外延在GaAs衬底上生长了CdSe/CdMnSe多量子阱结构.利用X射线衍射(XRD)、变密度激发的PL光谱、变温度PL光谱和变密度激发的ps时间分辨光谱研究了CdSe/CdMnSe多量子阱结构和激子复合特性.讨论了随温度升高辐射线宽展宽和辐射复合效率降低的机理.发现不同激发密度下发光衰减时间不同,认为它的机理可能是无辐射复合引起的.在该材料中观测到激子激子散射发射峰,它被变密度激发和变温度PL光谱所证实.
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关键词:
- CdSe/CdMnSe /
- 量子阱 /
- 光学性质
CdSe/Cd0.8Zn0.2 Se quantum wells were grown by means of molecular beam epitaxy on substrate GaAs. The emission peak from excition-exciton scattering is observed in CdSe/CdMnSe quantum wells. When weaker excitation is used, radiative recombination decay time of the exciton is reduced as the excitation intensity is decreased. The results indicate that the dominant mechanism may be quenching of exciton emission by impurities and defects.-
Keywords:
- CdSe/CdMnSe /
- Quantum Wells /
- Optical Properties
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