A facile method to synthesis high-quality CdSe quantum dots for large and tunable nonlinear absorption

被引：24

作者：

Cao, Yawan ^{[1
]}

Wang, Chong ^{[1
]}

Zhu, Baohua ^{[1
]}

Gu, Yuzong ^{[1
]}

机构：

[1] Henan Univ, Inst Microsyst Phys, Sch Phys & Elect, Kaifeng 475004, Peoples R China

来源：

OPTICAL MATERIALS | 2017年 / 66卷

基金：

中国国家自然科学基金;

关键词：

CdSe nanocrystals; Nonlinearity; Growth time; Z-scan; Resonance absorption; OPTICAL-PROPERTIES; II-VI; NANOCRYSTALS; NANOPARTICLES; SIZE;

D O I：

10.1016/j.optmat.2017.01.041

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The CdSe nanocrystals (NCs) were synthesized by a hot injection method in the atmospheric environment without any protective gas. The size of CdSe NC was tuned by controlling the growth time and the NCs' high-quality was confirmed by UV-visible spectroscopy, photoluminescence spectroscopy, X-ray diffraction and transmission electron microscopy. A large third-order nonlinear optical (NLO) absorption of CdSe NCs was obtained by using Z-scan technique with 30 ps excitation at 532 nm, which was tunable with variable size and the energy difference between the first exciton absorption peak and the laser wavelength. The NLO susceptibility of CdSe NCs can reach as high as 1.81 x 10(-10) esu at the size of 3.3 nm and at resonance absorption peak. (C) 2017 Elsevier B.V. All rights reserved.

引用

页码：59 / 64

页数：6

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