Fluorescence quantum efficiency of CdSe/CdS magic-sized quantum dots functionalized with carboxyl or hydroxyl groups

被引：17
|
作者：
Pilla, Viviane [1 ]
de Lima, Sthanley R. [1 ]
Andrade, Acacio A. [1 ]
Silva, Anielle C. A. [2 ]
Dantas, Noelio O. [2 ]
机构：
[1] Univ Fed Uberlandia, Inst Fis, GPOTM, BR-38400902 Uberlandia, MG, Brazil
[2] Univ Fed Uberlandia, Inst Fis, LNMIS, BR-38400902 Uberlandia, MG, Brazil
来源：
CHEMICAL PHYSICS LETTERS | 2013年 / 580卷
基金：
巴西圣保罗研究基金会;
关键词：
THERMAL LENS SPECTROMETRY; INDUCED PHASE MODULATION; DIFFERENT SOLVENTS; OPTICAL-PROPERTIES; NANOCRYSTALS; SEMICONDUCTOR; NANOPARTICLES; GLASSES; FILMS;
D O I：
10.1016/j.cplett.2013.07.007
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：
The present letter reports the thermo-optical properties of functionalized CdSe/CdS magic-sized quantum dots (MSQDs) (sizes 1.9-2.3 nm) with carboxyl (R-COOH) or hydroxyl (R-OH) groups in aqueous solutions. Atomic force microscopy and infrared transmittance measurements were used to determine the size of the QDs and to highlight the functionalized groups. Absolute nonradiative quantum efficiency (phi) and radiative quantum efficiency (eta) values were determined by applying two techniques: thermal lens (TL) and an alternative method that analyzes the ring patterns generated in a laser beam due to thermally induced self-phase-modulation effects known as the conical diffraction. Fluorescence measurements corroborate the TL results. (C) 2013 Elsevier B.V. All rights reserved.
引用
收藏
页码：130 / 134
页数：5
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