Optical properties of IV-VI quantum dots embedded in glass: Size-effects

被引：32
作者：
Dantas, N. O.
Qu, Fanyao
Monte, A. F. G.
Silva, R. S. [1 ]
Morais, P. C.
机构：
[1] Univ Brasilia, Inst Fis Nucl Fis Aplicada, BR-70910900 Brasilia, DF, Brazil
[2] Univ Fed Uberlandia, Inst Fis, LNMIS, BR-38400902 Uberlandia, MG, Brazil
来源：
JOURNAL OF NON-CRYSTALLINE SOLIDS | 2006年 / 352卷 / 32-35期
关键词：
nanocrystals; glasses; optical spectroscopy; atomic force and scanning tunneling microscopy; quantum wells; wires and dots; absorption; luminescence;
D O I：
10.1016/j.jnoncrysol.2006.03.085
中图分类号：
TQ174 [陶瓷工业]; TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
Measurements of the photoluminescence (PL), micro-PL, spatially-resolved PL, optical absorption and atomic force microscopy (AFM) of PbS and PbSe quantum dots (QDs) embedded in oxide glass matrix, were carried out. It was found that the energy gaps of the QDs showed pronounced anomalous temperature dependences. Their temperature coefficients depended strongly upon the size and shape of the QDs, and surface and/or confined phonon modes. In addition, the energy-dependent transfer rate of excitons from smaller to larger dots via electronic coupling was observed. It was predicted that further improvements in size selectivity, luminescence quantum yield, and well-controlled growth would enable highly efficient inter-dot energy transfer. (c) 2006 Elsevier B.V. All rights reserved.
引用
收藏
页码：3525 / 3529
页数：5
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