Unique oxide overcoating of CuInS2/ZnS core/shell quantum dots with ZnGa2O4 for fabrication of white light-emitting diode with improved operational stability
- Authors
- Song, Woo-Seuk; Jang, Eun-Pyo; Kim, Jong-Hoon; Jang, Ho Seong; Yang, Heesun
- Issue Date
- Feb-2013
- Publisher
- SPRINGER
- Keywords
- CuInS2/ZnS quantum dots; Blue-to-yellow color converters; White light-emitting diodes; ZnGa2O4 shell; Operational stability
- Citation
- JOURNAL OF NANOPARTICLE RESEARCH, v.15, no.2
- Journal Title
- JOURNAL OF NANOPARTICLE RESEARCH
- Volume
- 15
- Number
- 2
- URI
- https://scholarworks.bwise.kr/hongik/handle/2020.sw.hongik/17194
- DOI
- 10.1007/s11051-013-1462-3
- ISSN
- 1388-0764
- Abstract
- CuInS2 quantum dots (QDs) have been recently highlighted as blue-to-yellow color converters for the demonstration of QD-based white light-emitting diodes (LEDs) owing to their advantageous fluorescent attributes including a broadband yellow emission and exceptional quantum yield. Similar to other types of elaborate core/shell structured QDs, however, core/shell QDs of CuInS2/ZnS are also susceptible to the photo-induced degradation, rendering them inappropriate for the practical application to high operational stability white LED. In this study, CuInS2/ZnS QDs are overcoated with the unprecedented oxide phase of ZnGa2O4 to enhance their photostability, and the resulting CuInS2/ZnS/ZnGa2O4 QDs are characterized with X-ray diffraction and transmission electron microscope. The operational stability test of CuInS2/ZnS/ZnGa2O4 QD-based white LED is performed and compared with that of uncoated CuInS2/ZnS QD-based one, and the efficacy of ZnGa2O4 overlayer is proved in mitigating the photodegradation of QDs and thus improving the device stability.
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Collections - Graduate School > Materials Science and Engineering > 1. Journal Articles
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