期刊
JOURNAL OF NANOPARTICLE RESEARCH
卷 15, 期 2, 页码 -出版社
SPRINGER
DOI: 10.1007/s11051-013-1462-3
关键词
CuInS2/ZnS quantum dots; Blue-to-yellow color converters; White light-emitting diodes; ZnGa2O4 shell; Operational stability
资金
- National Research Foundation of Korea (NRF)
- Korea government (MEST) [2011-0013377, 2012K001320]
- National Research Foundation of Korea [2011-0013377, 2010-50192] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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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