White-light-emitting diodes based on iridium complexes via efficient energy transfer from a conjugated polymer

Efficient white-light-emitting diodes (WLEDs) have been developed using a polyfluorene-type blue-emitting conjugated polymer doped with green and red phosphorescent dyes. The emission spectrum of the conjugated polymer, which has a very high luminescent efficiency, shows a large spectral overlap with the absorbance of green and red iridium complexes. Also, efficient energy transfer from the conjugated polymer to the iridium complexes is observed. Poly(N-vinyl carbazole) is used to improve the miscibility between conjugated polymer and iridium complexes because of their poor chemical compatibility and phase separation. A white emission spectrum is easily obtained by varying the contents of the three materials and controlling the phase morphology. Moreover, these WLEDs show a voltage-independent electroluminescence owing to the threshold and driving voltage of the three materials being similar as a result of energy transfer.
Publisher
WILEY-V C H VERLAG GMBH
Issue Date
2006-03
Language
ENG
Keywords

ELECTROLUMINESCENT DEVICES; EMISSION; BLENDS; ELECTROPHOSPHORESCENCE; RED; PHOSPHORESCENCE; BLUE

Citation

ADVANCED FUNCTIONAL MATERIALS, v.16, no.5, pp.611 - 617

ISSN
1616-301X
DOI
10.1002/adfm.200500621
URI
http://hdl.handle.net/10203/4510
Appears in Collection
CBE-Journal Papers(저널논문)
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