Kim, Jong-Hoon Jang, Eun-Pyo Kwon, Yongwoo Jang, Ho Seong Do, Young Rag Yang, Heesun 2024-01-20T04:33:36Z 2024-01-20T04:33:36Z 2021-09-05 2016-03-25 0925-8388 https://pubs.kist.re.kr/handle/201004/124275 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. English ELSEVIER SCIENCE SA LIGHT-EMITTING-DIODES SEMICONDUCTOR NANOCRYSTALS OPERATIONAL STABILITY OPTICAL-PROPERTIES SILICA ELECTROLUMINESCENCE PHOTOLUMINESCENCE PERFORMANCE TERNARY DEVICE Enhanced fluorescent stability of copper indium sulfide quantum dots through incorporating aluminum into ZnS shell Article 10.1016/j.jallcom.2015.12.072 1 JOURNAL OF ALLOYS AND COMPOUNDS, v.662, pp.173 - 178 JOURNAL OF ALLOYS AND COMPOUNDS 662 173 178 scie scopus 000368336200023 2-s2.0-84951032798 Chemistry, Physical Materials Science, Multidisciplinary Metallurgy & Metallurgical Engineering Chemistry Materials Science Metallurgy & Metallurgical Engineering Article LIGHT-EMITTING-DIODES SEMICONDUCTOR NANOCRYSTALS OPERATIONAL STABILITY OPTICAL-PROPERTIES SILICA ELECTROLUMINESCENCE PHOTOLUMINESCENCE PERFORMANCE TERNARY DEVICE Copper indium sulfide Quantum dots Al-doped shell Fluorescent stability Light-emitting diodes