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

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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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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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Authors and Affiliations

  1. Department of Electronics and Computer Engineering, Hanyang University, Seoul, 133-791, Korea

    Kwang Seop Lee, Dea Uk Lee, Dong Chul Choo & Tae Whan Kim

  2. Department of Molecular Science and Technology, Ajou University, Suwon, 443-749, Korea

    Eui Dock Ryu & Sang Wook Kim

  3. Korea Research Institute of Chemical Technology, Daejeon, 305-600, Korea

    Jong Sun Lim

Authors
  1. Kwang Seop Lee
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  2. Dea Uk Lee
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  3. Dong Chul Choo
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  4. Tae Whan Kim
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  5. Eui Dock Ryu
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  6. Sang Wook Kim
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  7. Jong Sun Lim
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Correspondence to Tae Whan Kim.

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Lee, K.S., Lee, D.U., Choo, D.C. et al. Organic light-emitting devices fabricated utilizing core/shell CdSe/ZnS quantum dots embedded in a polyvinylcarbazole. J Mater Sci 46, 1239–1243 (2011). https://doi.org/10.1007/s10853-010-4903-8

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  • DOI: https://doi.org/10.1007/s10853-010-4903-8

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