White light emission from a polymer bilayer by incomplete cascade energy transfer

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White light emission was obtained from a light-emitting diodes (LEDs) prepared from an immiscible polymer blend consisting of poly(9,9'-dihexylfluorene-2,7-divinylene-m-phenylenevinylene-stat-p-phenylenevinylene) (PDHFPPV) and poly(2-methoxy-5-(2'ethy-hexyloxy)-1,4-phenylenevinylene) (MEH-PPV). An inefficient energy transfer between PDHFPPV and MEH-PPV was observed because the blends are partially miscible. More importantly, because the order of bandgap energy is PVK > PDHFPPV > MEH-PPV we observed pure and strong white emission from this PLEDs, which results from the efficient Forster-type energy transfer from PVK to PDHFPPV and the partial energy transfer from PDHFPPV to MEH-PPV. The ITO/(PVK/immiscible blend)/Li:Al devices showed more enhanced white-light output compared with that of the ITO/(immiscible blend)/Li:Al device. (c) 2005 Elsevier B.V. All rights reserved.
Publisher
ELSEVIER SCIENCE BV
Issue Date
2006-07
Language
English
Article Type
Article; Proceedings Paper
Keywords

EMITTING-DIODES; ELECTROLUMINESCENT DEVICES

Citation

CURRENT APPLIED PHYSICS, v.6, no.4, pp.640 - 643

ISSN
1567-1739
URI
http://hdl.handle.net/10203/4365
Appears in Collection
CBE-Journal Papers(저널논문)
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