White-light-emitting diodes using miscible polymer blend doped with phosphorescent dye

Hang Ken Lee, Tae Ho Kim, Jong Hyeok Park, Jai Kyeong Kim, O. Ok Park

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)

Abstract

We demonstrate that voltage-independent and highly efficient white light-emitting diodes (WLED) can be obtained based on phosphorescent dye-doped conjugated polymer blend films. Conjugated polymers are used as the blue and green emitters, as well as the energy host, and a phosphorescent dye is used as the red emitter and guest material. The phase-separation between the conjugated polymers is suppressed by blending miscible polymer and copolymer having the same moiety. Therefore, we expect that efficient Förster-type energy transfer occurs through this homogeneous morphology. By introducing the copolymer into the emissive layer to enhance its miscibility, we obtained a voltage-invariant white emission from the polymeric LEDs. The luminous efficiency of the WLED with the single active layer is increased dramatically by introducing the phosphorescent dopant as a red emitter.

Original languageEnglish
Pages (from-to)891-896
Number of pages6
JournalOrganic Electronics
Volume12
Issue number6
DOIs
Publication statusPublished - 2011 Jun

Bibliographical note

Funding Information:
This work was supported by ERC grant of National Research Foundation (NRF) funded by the Korea Ministry of Education, Science and Technology (MEST) (No. R11-2007-045-01002-0(2009) ). It was also partially supported by a Grant (code #: 2010k000345 ) from ‘Center for Nanostructured Materials Technology’ under ‘21st Century Frontier R&D Programs’ of the Ministry of Education, Science and Technology, South Korea.

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Chemistry(all)
  • Condensed Matter Physics
  • Materials Chemistry
  • Electrical and Electronic Engineering

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