Enhanced fluorescent stability of copper indium sulfide quantum dots through incorporating aluminum into ZnS shell

Title
Enhanced fluorescent stability of copper indium sulfide quantum dots through incorporating aluminum into ZnS shell
Authors
김종훈장은표권용우장호성도영락양희선
Keywords
Cd-free; quantum dots; core/shell; fluorescence
Issue Date
2015-12
Publisher
Journal of alloys and compounds
Citation
VOL 662, 173-178
Abstract
Fluorescent quantum dots (QDs) become usually deteriorated, losing their originally high quantum yield (QY), upon a prolonged exposure to degradable environments, and this lack of long-term QD stability retards their ultimate industrial application. For an effort to significantly improve the fluorescent stability of copper indium sulfide (Cu-In-S, CIS) QDs, in this work, synthesis of double-shelled CIS/ZnS/ZnS: Al QDs with intermediate ZnS shell and outer Al-doped ZnS shell is attempted. The resultant yellow-mitting CIS/ZnS/ZnS: Al QDs possess an excellent QY of 77%. For comparison, standard double shell-structured, Al-doping free CIS/ZnS/ZnS QDs are also prepared. These two types of QDs are then subjected to continuous UV irradiation and heat for certain periods of time and their temporal fluorescent stability behaviors are compared, clearly showing a superior stability from QDs with Al-doped shell. This is attributable to the effective QD passivation by Al2O3 layer generated via photochemical or thermal oxidation of Al doped in ZnS shell. The above results are further verified by fabricating QD-based light-mitting diodes (LEDs) with the combination of QD down-converters with a blue LED and comparing their electroluminescent stability with operational time. (C) 2015 Elsevier B.V. All rights reserved.
URI
http://pubs.kist.re.kr/handle/201004/58466
ISSN
09258388
Appears in Collections:
KIST Publication > Article
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