Thermal-lens study of thermo-optical properties of CdSe/ZnS quantum dots embedded into PMMA matrix

被引：0
|
作者：
Pilla, Viviane [1 ]
Munin, Egberto [1 ]
Alves, Leandro P. [1 ]
Pacheco, Marcos T. T. [1 ]
机构：
[1] UNIVAP, Inst Pesquisas & Desenvolvimento, CEP 12244-000, Sao Jose Dos Campos, SP, Brazil
来源：
QUANTUM DOTS, PARTICLES, AND NANOCLUSTERS IV | 2007年 / 6481卷
基金：
巴西圣保罗研究基金会;
关键词：
CdSe/ZnS core-shell colloidal nanoparticles; thermal lens; spectroscopic properties;
D O I：
10.1117/12.701118
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
Thermal Lens (TL) and spectroscopic characterizations were performed in CdSe/ZnS core-shell nanoparticles embedded into the underlying polymethyl methacrylate (PMMA) dissolved in chloroform (CHCl3). TL measurements were accomplished injunction of the CdSe/ZnS quantum-dot concentration (12-60 mg/ml). The average value obtained for the thermal diffusivity was (0.85 +/- 0.02) x 10(-3) cm(2)/S. The absolute nonradiative quantum efficiency phi and the fluorescence quantum efficiency eta were determined by the TL method Higher values of phi were obtained with the increase of the core-shell nanoparticles concentrations in PMMA-chloroform solutions. These results are in agreement with the behavior of fluorescence spectra that decrease with CdSe/ZnS concentration increase.
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页数：8
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