Nonradiative Recombination of Excitons in Semimagnetic Quantum Dots

被引：4

作者：

Chernenko, A. V. ^{[1
]}

机构：

[1] Russian Acad Sci, Inst Solid State Phys, Chernogolovka 142432, Moscow Oblast, Russia

来源：

SEMICONDUCTORS | 2015年 / 49卷 / 12期

基金：

俄罗斯基础研究基金会;

关键词：

LUMINESCENT CENTERS; SPIN POLARIZATION; MAGNETIC-FIELD; EXCITATION; MATRIX; IONS; ENHANCEMENT; MECHANISMS;

D O I：

10.1134/S1063782615120064

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

The mechanisms of the nonradiative recombination of excitons in neutral and charged quantum dots based on II-VI semimagnetic semiconductors are investigated. It is shown that, along with the dipole-dipole and direct-exchange mechanisms, there is one more mechanism referred to as the indirect-exchange mechanism and related to sp-d mixing. The selection rules for nonradiative recombination by exchange mechanisms are subsequently derived. The dependence of the efficiency of all recombination mechanisms on the quantum-dot size is studied. The experimentally observed growth in the intracenter photoluminescence intensity with decreasing size of dots and nanocrystals is accounted for. Methods for experimental determination of the contributions of different mechanisms to nonradiative recombination are discussed.

引用

页码：1575 / 1581

页数：7

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