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Anomalous Stokes shift in CdSe nanocrystals

机译:CdSe纳米晶体中的异常斯托克斯位移

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We investigate the temperature dependence of exciton fluorescence, absorption, and Stokes shift for five sizes of high quality CdSe/ZnS nanocrystals from the perspective of the fine structure model and exciton-acoustic phonon coupling. The Stokes shift is found to have a weak temperature dependence for all sizes. Within the fine structure model, we use the temperature dependence of the Stokes shift to infer the upper level energy and oscillator strength. We also interpret our ensemble measurements using an exciton-acoustic phonon scattering model. We find that neither the fine structure nor exciton-acoustic phonon scattering is able to adequately explain our data in isolation and conclude that a comprehensive theory which includes the physics of both models on an equal footing is required.
机译:我们从精细结构模型和激子-声子声子耦合的角度研究了五个尺寸的高质量CdSe / ZnS纳米晶体的激子荧光,吸收和斯托克斯位移的温度依赖性。发现斯托克斯位移对所有尺寸的温度依赖性都很弱。在精细结构模型中,我们使用斯托克斯位移的温度依赖性来推断上层能量和振荡器强度。我们还使用激子-声子声子散射模型解释集合测量。我们发现,精细的结构和激子声子的声子散射都不能孤立地充分解释我们的数据,并得出结论,需要一个综合的理论,其中包括两个模型在相等基础上的物理性质。

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