Study of the persistent spectral hole burning memory made by semiconductor nanocrystals

在CuCl量子点嵌入玻璃、NaCl晶体和KCl晶体中声学声子的尺寸确认效应已被广泛研究，以有效地利用持久光谱燃烧作为尺寸选择性光谱学。“观察到的大小被确认的声学声子能量与弹性球中被确认的声学声子模式的能量相比较，并且被观察到的光刺激发光是第一次被植入到NaCl晶体中的CuCl量子点。”热加速、自发衰减和兴奋--光致发光发光的通量依赖几乎与那些持久光谱孔燃烧的那些相同，并指示量子点的光致发光和子序列载体捕获在陷阱附近的量子点的光致发光和持久光谱孔燃烧的现象。The traps are considered to be Cuy D1 + NaCl which acts as electron or hole traps。Accumulated photon echo from CuCl and CuBr quantum dots was extensively investigated at low temperManagement up to 0.5 K。The Experimental Results gave us systematic knowledge on the temperature dependent homogeneous linewidth of excitons in Quantum dots。在非常低的温度下，最主要的解相位机制是由量子点及其环绕矩阵组成的两级系统的量子点的相互作用。

Size-confinement effect of acoustic phonon in CuCl quantum dots embedded in glass, NaCl crystal and KCl crystal was extensively studied by utilizing persistent spectral burning as size-selective spectroscopy. The observed size-confined acoustic phonon energies were compared with energies of acoustic phonon modes confined in elastic spheres.Photostimulated luminescence was observed for the first time in CuCl quantum dots embedded in NaCl crystal. The thermal quenching, spontaneous decay and excitation-fluence dependence of the photostimulated luminescence were almost the same as those of persistent spectral hole burning, indicating that the photoionization of quantum dots and the subsequent carrier capture at the traps near the quantum dots bring forth both the photostimulated luminescence and the persistent spectral hole burning. The traps are considered to be CuィイD1+ィエD1 in NaCl which acts as electron or hole traps.Accumulated photon echo from CuCl and CuBr quantum dots was extensively investigated at low temperatures up to 0.5 K. The experimental results gave us systematic knowledge on the temperature dependent homogeneous linewidth of excitons in quantum dots. At very low temperatures, the most dominant dephasing mechanism is the interaction of the quantum dots with the two-level system formed by quantum dots and their surrounding matrix.