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

Title
White-light-emitting diodes using miscible polymer blend doped with phosphorescent dye
Authors
이행근김태호박종혁김재경박오옥
Keywords
White-light-emitting diodes; Miscibility; Voltage-stable; Phosphorescent dopant
Issue Date
2011-06
Publisher
Organic electronics
Citation
VOL 12, NO 6, 891-896
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 phaseseparation 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.
URI
http://pubs.kist.re.kr/handle/201004/39908
ISSN
1566-1199
Appears in Collections:
KIST Publication > Article
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