White emission from a polymer blend light-emitting diode by incomplete cascade energy transfer

Authors
Lee, TWPark, OOCho, HNHong, JMKim, YC
Issue Date
2001-12
Publisher
TAYLOR & FRANCIS LTD
Citation
MOLECULAR CRYSTALS AND LIQUID CRYSTALS, v.371, pp.435 - 438
Abstract
White light emission was obtained from a polymer light-emitting diode (LED) made of a ternary polymer blend comprised 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) (19:1:1 by wt.). Incomplete cascade energy transfer was employed to obtain white emission from the polymer blend LED. Compatibility between PVK and CPDHFPV facilitated the Forster-type energy transfer from PVK to CPDHFPV. However, poor compatibility between CPDHFPV and MEH-PPV resulted in a partial energy transfer between the polymers causing the blend to emit two colors simultaneously. Consequently, pure white color near CIE coordinate (0.33, 0.33) could be obtained with a low sensitivity to the drive voltage.
Keywords
electroluminescence; white emission; energy transfer
ISSN
1058-725X
URI
https://pubs.kist.re.kr/handle/201004/139986
DOI
10.1080/10587250108024777
Appears in Collections:
KIST Article > 2001
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