CdTe1‐xSex/Cd0.5Zn0.5S core/shell quantum dots: core composition and property. (15th August 2013)

• Record Type: Journal Article
• Authors: Yang, Ping; Cao, Yongqiang; Li, Xiaoyu; Zhang, Ruili; Liu, Ning; Zhang, Yulan
• Is Part Of: Luminescence. Volume 29:Number 5(2014:Sep./Oct.)
• Page Start: 407
• Page End: 411
• Publication Date: 2013-08-15
• Subjects: Luminescence -- Periodicals; Bioluminescence -- Periodicals; Chemiluminescence -- Periodicals; Luminescence -- Periodicals; 535.35
• DOI: 10.1002/bio.2560
• Languages: English
• ISSNs: 1522-7235

Abstract

<abstract abstract-type="main"> <title>ABSTRACT</title> <p>Alloy CdTe_1‐xSe_x quantum dots (QDs) have been fabricated by an organic route using Cd, Te and Se precursors in a mixture of trioctylamine and octadecylphosphonic acid at 280 °C. The variation of photoluminescence (PL) peak wavelength of the CdTe_1‐xSe_x QDs compared with CdTe QDs confirmed the formation of an alloy structure. The Se component drastically affected the stability of CdTe_1‐xSe_x QDs. A Cd_0.5Zn_0.5S shell coating on CdTe_1‐xSe_x cores was carried out using oleic acid as a capping agent. CdTe_1‐xSe_x/Cd_0.5Zn_0.5S core/shell QDs revealed dark red PL while a yellow PL peak was observed for the CdTe_1‐xSe_x cores. The PL efficiency of the core/shell QDs was drastically increased (less than 1% for the cores and up to 65% for the core/shell QDs). The stability of QDs in various buffer solutions was investigated. Core/shell QDs can be used for biological applications because of their high stability, tunable PL and high PL efficiency. Copyright © 2013 John Wiley &amp; Sons, Ltd.</p> </abstract>