Organic light-emitting devices fabricated utilizing core/shell CdSe/ZnS quantum dots embedded in a polyvinylcarbazole
- Authors
- Lee, Kwang Seop; Lee, Dea Uk; Choo, Dong Chul; Kim, Tae Whan; Ryu, Eui Dock; Kim, Sang Wook; Lim, Jong Sun
- Issue Date
- Mar-2011
- Publisher
- SPRINGER
- Citation
- JOURNAL OF MATERIALS SCIENCE, v.46, no.5, pp.1239 - 1243
- Indexed
- SCIE
SCOPUS
- Journal Title
- JOURNAL OF MATERIALS SCIENCE
- Volume
- 46
- Number
- 5
- Start Page
- 1239
- End Page
- 1243
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/168908
- DOI
- 10.1007/s10853-010-4903-8
- ISSN
- 0022-2461
- Abstract
- Electrical and the optical properties of organic light-emitting devices (OLEDs) fabricated utilizing core/shell CdSe/ZnS quantum dots (QDs) embedded in a polyvinylcarbazole (PVK) layer were investigated. An abrupt increase of the current density above an applied voltage of 12 V for OLEDs consisting of Al/LiF/4,7-diphenyl-1,10-phenanthroline/bis-(2-methyl-8-quinolinolate)-4-(phenylphenolato) aluminium/[CdSe/ZnS QDs embedded in PVK]/poly(3,4-ethylenedioxythiophene) and poly(styrenesulfonate)/ITO/glass substrate was attributed to the existence of the QDs. Photoluminescence spectra showed that the peaks at 390 and 636 nm corresponding to the PVK layer and the CdSe/ZnS QDs were observed. While the electroluminescence (EL) peak of the OLEDs at low voltage range was related to the PVK layer, the EL peak of the OLEDs above 12 V was dominantly attributed to the CdSe/ZnS QDs. The Commission Internationale de l'Eclairage (CIE) chromaticity coordinates of the OLEDs at high voltages were (0.581, 0.380) indicative of a red color. When the holes existing in the PVK layer above 12 V were tunneled into the CdSe/ZnS QDs, the holes occupied by the CdSe/ZnS QDs combined with the electrons in the PVK layer to emit a red color related to the CdSe/ZnS QDs.
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