Onion-like (CdSe) ZnS/CdSe/ZnS quantum-dot-quantum-well heteronanocrystals for investigation of multi-color emission

被引：63
作者：
Nizamoglu, Sedat
Demir, Hilmi Volkan [1 ]
机构：
[1] Bilkent Univ, Dept Elect & Elect Engn, Dept Phys, Nanotechnol Res Ctr, TR-06800 Ankara, Turkey
[2] Bilkent Univ, Inst Mat Sci & Nanotechnol, TR-06800 Ankara, Turkey
来源：
OPTICS EXPRESS | 2008年 / 16卷 / 06期
关键词：
D O I：
10.1364/OE.16.003515
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
We investigate multi-color spontaneous emission from quantum-dot-quantum-well heteronanocrystals made of onion-like (CdSe) ZnS/CdSe/ZnS ( core) shell/shell/shell structures, with our theoretical results explaining experimental measurements for the first time. In such multi-layered heteronanocrystals, we discover that the carrier localization is tuned from type-1-like to type-2-like localization by controlling CdSe and ZnS shell thicknesses, and that 3-monolayer ZnS barriers are not necessarily sufficient for carrier localization, unlike in conventional ( CdSe) ZnS ( core) shell structures. We demonstrate that exciton localization in distinct layers of ( CdSe) ZnS/CdSe/ZnS heteronanocrystals with high transition probability ( for n=1 states in CdSe core and n=2 states in CdSe shell) is key to their multi-color emission. (c) 2008 Optical Society of America.
引用
收藏
页码：3515 / 3526
页数：12
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