Photoluminescence Blue-Shift of CdSe Nanoparticles Caused by Exchange of Surface Capping Layer

被引：40

作者：

Luo, Xiangdong ^{[1
,2
]}

Liu, Peisheng ^{[2
]}

Nguyen Tam Nguyen Truong ^{[1
]}

Farva, Umme ^{[1
]}

Park, Chinho ^{[1
]}

机构：

[1] Yeungnam Univ, Sch Chem Engn, Gyongsan 712749, South Korea

[2] Nantong Univ, Jiangsu Key Lab ASIC Design, Nantong 226019, Peoples R China

来源：

JOURNAL OF PHYSICAL CHEMISTRY C | 2011年 / 115卷 / 43期

关键词：

OPTICAL-PROPERTIES; QUANTUM DOTS; SOLAR-CELLS; NANOCRYSTALS; CDTE;

D O I：

10.1021/jp200701x

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

TOPO- and pyridine-capped cubic CdSe quantum dots were prepared, and the effect of surface ligand exchange on the photoluminescence (PL) peak shift was investigated. From the analysis of PL spectra and TEM images, it was found that the decrease in diameter in the CdSe quantum dot and redistribution of its surface electronic density play different roles in the PL peak shift. The reduction in size of CdSe by ligand exchange caused a blue shift of the PL peak due to the quantum confinement effect, whereas the redistribution of surface electronic density of CdSe by the exchange of TOPO with pyridine resulted in a red shift of 23 meV on the average for the samples investigated. The result was also supported by the XPS characterizations.

引用

页码：20817 / 20823

页数：7

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