Widely Tunable Emissions of Colloidal ZnxCd1-xSe Alloy Quantum Dots Using a Constant Zn/Cd Precursor Ratio

Title
Widely Tunable Emissions of Colloidal ZnxCd1-xSe Alloy Quantum Dots Using a Constant Zn/Cd Precursor Ratio
Authors
김종욱이종진장호성전덕영양희선
Keywords
ZnxCd1-xSe; quantum dots; luminescence; Tunable Emissions; Constant Precursor Ratio
Issue Date
2011-01
Publisher
Journal of nanoscience and nanotechnology
Citation
VOL 11, NO 1, 725-729
Abstract
The widely tunable emissions of ZnxCd1−xSe alloy quantum dots (QDs), which emit green to red wavelengths from 534 to 620 nm, are reported. Green-, yellow-, orange-, and red-emitting QDs were synthesized by varying a point of time for oleylamine (as a co-surfactant) addition and a Se precursor amount, and keeping a constant Zn/Cd precursor ratio. With reaction time the alloying and particle growth of the alloy QDs progressed simultaneously in the opposite direction in the variation of their band gap. However, the band gap energies of all QDs were observed to be gradually blueshifted due to the slight dominance of alloying over the particle growth effect. The compositions of alloy QDs were estimated based on their sizes and band gap energies. ZnxCd1−xSe core QDs were also overcoated with a ZnSe shell with a higher band gap to enhance their quantum yields.
URI
http://pubs.kist.re.kr/handle/201004/39341
ISSN
1533-4880
Appears in Collections:
KIST Publication > Article
Files in This Item:
There are no files associated with this item.
Export
RIS (EndNote)
XLS (Excel)
XML


qrcode

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

BROWSE