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

半导体纳米晶持久光谱烧孔存储器的研究

基本信息

批准号：
10554011
负责人：
MASUMOTO Yasuaki
金额：
$ 8.13万
依托单位：
University of Tsukuba
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1998
资助国家：
日本
起止时间：
1998 至 1999
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-10554011/
关键词：
quantum dot confined acoustic phonon size effect photostimulated luminescence photon echo persistent hole burning two-level system CuCl ニ準位系 CuBr 銅イオントラップトラップ Fセンター

项目摘要

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.

通过利用持续的光谱燃烧作为尺寸选择性光谱法，通过嵌入玻璃，NaCl晶体和KCL晶体的CUCL量子点中的声音量的尺寸结合效应进行了广泛研究。将观察到的尺寸结合的声音子声子与限制在弹性球中的声音模式的能量进行了比较。在嵌入NaCl晶体中的CUCL量子点中，首次观察到了photostostiment的发光。光刺激的发光的热淬火，赞助商 - 末期和兴奋依赖性几乎与持续的光谱孔燃烧的发光几乎相同，这表明量子点的光电离和量子附近的陷阱的随后载体捕获量的随后载体捕获量子，这两个量子点都带来了光粘粘合的光泽度的启发性亮度光泽孔和效果。陷阱。从CUCL和Cubr量子点中蓄能的光子回波在高达0.5 K的低温下进行了广泛研究。实验结果使我们对量子点中激子的温度依赖性均匀线宽的系统了解。在非常低的温度下，最主要的去向物机制是量子点与由量子点及其周围矩阵形成的两级系统的相互作用。