White emission from a ternary polymer blend by incomplete cascade energy transfer

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White light emission was obtained from a light-emitting diode (LED) prepared from a ternary polymer blend (19:1:1 by weight) consisting of poly(9-vinylcarbazole) (PVK), poly(9,9 ' -dihexlyfluorene-2,7-divinylene-m-phenylenevinylene-stat-p-phenylenevinylene) (CPDHFPV), and poly[2-methoxy-5-(2 ' -ethyl-hexyloxy)-1,4-phenylenevinylene] (MEH-PPV). where the order of bandgap energy is PVK > CPDHFPV > MEH-PPV. The major component PVK acted not only as the matrix or diluent but also as the excitation energy donor to help the blend generate white light with high efficiency. Good miscibility between PVK and CPDHFPV facilitated the Forster-type excitation energy transfer from PVK to CPDHFPV enhancing the quantum efficiency. However, poor miscibility between CPDHFPV and MEH-PPV resulted in partial energy transfer between the polymers causing the blend to emit two colors simultaneously. Consequently, the incomplete cascade energy transfer in the blend generated a pure white color near CIE coordinate (0.33, 0.33) and the emissive color of this system showed a low sensitivity to the drive voltage. (C) 2001 Elsevier Science B.V. All rights reserved.
Publisher
ELSEVIER SCIENCE SA
Issue Date
2001-06
Language
English
Article Type
Article
Keywords

LIGHT-EMITTING-DIODES; ELECTROLUMINESCENT DEVICES

Citation

SYNTHETIC METALS, v.122, no.2, pp.437 - 441

ISSN
0379-6779
URI
http://hdl.handle.net/10203/5084
Appears in Collection
CBE-Journal Papers(저널논문)
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