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 journalArticle

10 Citations (Scopus)


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
Issue number6
Publication statusPublished - 2011 Jun

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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