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)

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 Jan 1

Fingerprint

polymer blends
Conjugated polymers
Polymer blends
Light emitting diodes
emitters
Coloring Agents
light emitting diodes
Dyes
dyes
copolymers
polymers
Copolymers
Electric potential
electric potential
Phase separation
Energy transfer
Polymers
solubility
Solubility
energy transfer

All Science Journal Classification (ASJC) codes

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

Cite this

Lee, Hang Ken ; Kim, Tae Ho ; Park, Jong Hyeok ; Kim, Jai Kyeong ; Park, O. Ok. / White-light-emitting diodes using miscible polymer blend doped with phosphorescent dye. In: Organic Electronics. 2011 ; Vol. 12, No. 6. pp. 891-896.
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White-light-emitting diodes using miscible polymer blend doped with phosphorescent dye. / Lee, Hang Ken; Kim, Tae Ho; Park, Jong Hyeok; Kim, Jai Kyeong; Park, O. Ok.

In: Organic Electronics, Vol. 12, No. 6, 01.01.2011, p. 891-896.

Research output: Contribution to journalArticle

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AB - 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.

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