【摘要】 通过光致发光 (PL)和拉曼 (Raman)光谱研究了分子束外延 (MBE)生长的 Zn Mg Se/ Zn Cd Se多量子阱的光学性质。在 80 K到 3 0 0 K温度范围内 ,观测到了 PL光谱中来自量子阱的自由激子发光 ,通过发光强度与温度的变化关系 ,计算了激子束缚能。结果表明在 Zn Mg Se/ Zn Cd Se多量子阱 (MQWs)势垒层中 ,Mg的引进增强了量子阱的限制效应 ,导致激子具有较好的二维特性。在室温下的 Raman光谱中观测到了多级纵光学声子(LO)和横光学声子 (TO)的限制模 ,表明多层结构具有较高的质量更多还原

【Abstract】 Optical properties of ZnCdSe/ZnMgSe multiple quantum wells (MQWs) grown by molecular beam epitaxy (MBE) are studied by the photoluminescence (PL) and Raman scattering spectra. In PL spectra, an intense emission band coming from free excition luminescence of the quantum wells can be observed from 80 K to 300 K. The excition binding energy is calculated by the dependence of PL intensity on the temperature which shows the behavior of the two dimension excitons. The result indicates that the enhancement of the confinement effect by the induced Mg in the barrier layers. The Raman scattering classifying into the longitudinal optical photon (LO) and transverse optical photon confined in quantum wells are observed at room temperature (RT), which confirms the formation of a multilayer structure with the higher crystalline quality.更多还原