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CdSe/CdZnSe超晶格的激子光学性质的研究 总被引:2,自引:2,他引:0
用分子束外延法在GaAs衬底上生长了CdSe/Cd0.65Zn0.35Se超晶格结构。利用X射线衍射(XRD)、77K下变密度激发的光致发光光谱和变温度光致发光光谱研究了CdSe/CdZnSe超晶格结构和激光复合特性,在该材料中观测到激子-激子散射发射峰,变密度激发光致发光光谱和谱温度光致发光光谱证实了这一现象,激子发射峰的线宽随着温度的升高而展宽,低温时发光峰的宽度主要是由合金组分和阱垒起伏引起的,没温时激子线宽展宽是由于激子与纵光学声子和离化的施主杂质间的散射作用引起的,光致发光的强度随着温度的升高而降低,这主要是由激子的热离化造成的,也就是说,热激发使得电子或空穴由阱中跃迁至垒上。 相似文献
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The optical properties of both the annealed and as-deposited ZnO thin films by radio frequency (RF)magnetron sputtering on SiO2 substrates were studied. In the annealed films, two pronounced well defined exciton absorption peaks for the A and B excitons were obtained in the absorption spectra, a strong free exciton emission without deep-level emissions was observed in the photoluminescence (PL) spectra at room temperature. It was found that annealing the films in oxygen dramatically improved the optical properties and the quality of the films. 相似文献