Organic light-emitting devices fabricated utilizing core/shell CdSe/ZnS quantum dots embedded in a polyvinylcarbazole

Kwang Seop Lee, Dea Uk Lee, Dong Chul Choo, Taewhan Kim, Eui Dock Ryu, Sang Wook Kim, Jong Sun Lim

Research output: Contribution to journalArticle

18 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)1239-1243
Number of pages5
JournalJournal of Materials Science
Volume46
Issue number5
DOIs
StatePublished - 2011 Mar 1

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Semiconductor quantum dots
Electroluminescence
Electric potential
Color
ITO glass
Aluminum
Photoluminescence
Current density
Optical properties
Electrons
Substrates

Cite this

Lee, Kwang Seop ; Lee, Dea Uk ; Choo, Dong Chul ; Kim, Taewhan ; Ryu, Eui Dock ; Kim, Sang Wook ; Lim, Jong Sun. / Organic light-emitting devices fabricated utilizing core/shell CdSe/ZnS quantum dots embedded in a polyvinylcarbazole. In: Journal of Materials Science. 2011 ; Vol. 46, No. 5. pp. 1239-1243.
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Organic light-emitting devices fabricated utilizing core/shell CdSe/ZnS quantum dots embedded in a polyvinylcarbazole. / Lee, Kwang Seop; Lee, Dea Uk; Choo, Dong Chul; Kim, Taewhan; Ryu, Eui Dock; Kim, Sang Wook; Lim, Jong Sun.

In: Journal of Materials Science, Vol. 46, No. 5, 01.03.2011, p. 1239-1243.

Research output: Contribution to journalArticle

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AU - Lee, Kwang Seop

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AU - Kim, Sang Wook

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