Journal of Materials Science

, Volume 46, Issue 5, pp 1239–1243 | Cite as

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
  • Tae Whan Kim
  • Eui Dock Ryu
  • Sang Wook Kim
  • Jong Sun Lim
Article

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.

Notes

Acknowledgement

This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MEST) (No. 2010-0018877).

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Copyright information

© Springer Science+Business Media, LLC 2010

Authors and Affiliations

  • Kwang Seop Lee
    • 1
  • Dea Uk Lee
    • 1
  • Dong Chul Choo
    • 1
  • Tae Whan Kim
    • 1
  • Eui Dock Ryu
    • 2
  • Sang Wook Kim
    • 2
  • Jong Sun Lim
    • 3
  1. 1.Department of Electronics and Computer EngineeringHanyang UniversitySeoulKorea
  2. 2.Department of Molecular Science and TechnologyAjou UniversitySuwonKorea
  3. 3.Korea Research Institute of Chemical TechnologyDaejeonKorea

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