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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 18, Iss. 17 — Aug. 16, 2010
  • pp: 18303–18311

Highly efficient hybrid light-emitting device using complex of CdSe/ZnS quantum dots embedded in co-polymer as an active layer

Byoung-Ho Kang, Jun-Seon Seo, Sohee Jeong, Jihye Lee, Chang-Soo Han, Do-Eok Kim, Kyu-Jin Kim, Se-Hyuk Yeom, Dae-Hyuk Kwon, Hak-Rin Kim, and Shin-Won Kang  »View Author Affiliations


Optics Express, Vol. 18, Issue 17, pp. 18303-18311 (2010)
http://dx.doi.org/10.1364/OE.18.018303


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Abstract

We propose a highly efficient hybrid light-emitting device (LED) with a single active layer where CdSe/ZnS quantum dots (QDs) are dispersed as a guest material in a conjugated polymer (co-polymer) matrix used for a host material. In our structure, the QDs act on light-emitting chromophores by trapping the migrating excitons in the co-polymer matrix via Förster energy transfer, and improve the charge balance within the co-polymer by trapping the injected electron carriers. Experimental results show that the electroluminescent properties highly depend on the doping density of the QDs within the co-polymer matrix, where the luminance as well as the external current efficiency are initially enhanced with increasing the concentration of the dispersed QDs in the co-polymer solution, and then such properties are degraded due to aggregation of the QDs. We can get the maximum brightness of 9,088 cd/m2 and the maximum external current efficiency of 7.5 cd/A in mixing ratio of the QDs by 1.0 wt%. The external current efficiency is enhanced by over 15 times and the turn-on voltage is reduced in comparison with the corresponding values for a reference device that uses only a co-polymer as an active layer.

© 2010 OSA

OCIS Codes
(230.3670) Optical devices : Light-emitting diodes
(160.4236) Materials : Nanomaterials

ToC Category:
Optical Devices

History
Original Manuscript: April 19, 2010
Revised Manuscript: June 25, 2010
Manuscript Accepted: July 27, 2010
Published: August 11, 2010

Citation
Byoung-Ho Kang, Jun-Seon Seo, Sohee Jeong, Jihye Lee, Chang-Soo Han, Do-Eok Kim, Kyu-Jin Kim, Se-Hyuk Yeom, Dae-Hyuk Kwon, Hak-Rin Kim, and Shin-Won Kang, "Highly efficient hybrid light-emitting device using complex of CdSe/ZnS quantum dots embedded in co-polymer as an active layer," Opt. Express 18, 18303-18311 (2010)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-18-17-18303


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