Ordered dispersion of ZnO quantum dots in SiO2 matrix and its strong emission properties

被引：59

作者：

Panigrahi, Shrabani ^{[1
]}

Bera, Ashok ^{[1
]}

Basak, Durga ^{[1
]}

机构：

[1] Indian Assoc Cultivat Sci, Dept Solid State Phys, Kolkata 700032, India

来源：

JOURNAL OF COLLOID AND INTERFACE SCIENCE | 2011年 / 353卷 / 01期

关键词：

Quantum dots; Nanocomposite; Fluorescence; Display; Dispersion; Interface; REVERSE MICROEMULSION METHOD; CHEMICAL-VAPOR-DEPOSITION; THIN-FILMS; OXYGEN-DEFICIENT; SILICA SPHERES; POROUS SILICON; NANOPARTICLES; LUMINESCENCE; PARTICLES; GROWTH;

D O I：

10.1016/j.jcis.2010.09.055

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：

ZnO nanoparticles in the form of quantum dots (QDs) have been dispersed in SiO2 matrix using StOber method to form ZnO QDs-SiO2 nanocomposites. Addition of tetraethyl orthosilicate (TEOS) to an ethanolic solution of ZnO nanoparticles produces random dispersion. On the other hand, addition of ZnO nanoparticles to an already hydrolyzed ethanolic TEOS solution results in a chain-like ordered dispersion. The photoluminescence spectra of the as-grown nanocomposites show strong emission in the ultraviolet region. When annealed at higher temperature, depending on the sample type, these show strong red or white emission. Interestingly, when the excitation is removed, the orderly dispersed ZnO QDs-SiO2 composite shows a very bright blue fluorescence visible by naked eyes for few seconds indicating their promise for display applications. The emission property has been explained in the light of structure-property relationship. (C) 2010 Elsevier Inc. All rights reserved.

引用

页码：30 / 38

页数：9

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