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Proceedings Paper

Efficient bipolar carrier transport in oligofluorenes
Author(s): Chung-chih Wu; Li-Yin Chen; Wen-Yi Hung; T.-L. Liu; W.-G. Liu; Y.-T. Lin; T.-H. Ke; H.-W. Lin; T.-C. Chao; T.-H. Hung; R.-T. Chen; Y.-Y. Chien; K.-T. Wong
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Paper Abstract

Fluorene-based materials, such as polyfluorenes or oligofluorenes, are conventionally well known as efficient blue emitting materials. Intriguingly, it is recently unveiled that ter(9,9-diarylfluorene)s also exhibit efficient unusual nondispersive bipolar carrier-transport characteristics and high carrier mobilities of >10-3 cm2/Vs for both holes and electrons in the amorphous state. Making use of convenient substitution on C9 of fluorenes and corresponding variety in molecular structures and physical properties, in this work we systematically investigate influences of molecular structures, such as dialkyl-substitution vs. diaryl-substitution and oligomer length etc., on charge transport of oligofluorenes. Furthermore, utilizing liquid-crystalline properties of oligofluorenes with appropriate substitutions, comparative studies of carrier transport of oligofluornes in both vacuum-deposited amorphous states and aligned liquid-crystal glass states are also performed. Insights on intermolecular charge transport derived from the experimental observations and theoretical examinations are then discussed accordingly.

Paper Details

Date Published: 8 October 2005
PDF: 9 pages
Proc. SPIE 5937, Organic Light-Emitting Materials and Devices IX, 59371A (8 October 2005); doi: 10.1117/12.622680
Show Author Affiliations
Chung-chih Wu, National Taiwan Univ. (Taiwan)
Li-Yin Chen, National Taiwan Univ. (Taiwan)
Wen-Yi Hung, National Taiwan Univ. (Taiwan)
T.-L. Liu, National Taiwan Univ. (Taiwan)
W.-G. Liu, National Taiwan Univ. (Taiwan)
Y.-T. Lin, National Taiwan Univ. (Taiwan)
T.-H. Ke, National Taiwan Univ. (Taiwan)
H.-W. Lin, National Taiwan Univ. (Taiwan)
T.-C. Chao, National Taiwan Univ. (Taiwan)
T.-H. Hung, National Taiwan Univ. (Taiwan)
R.-T. Chen, National Taiwan Univ. (Taiwan)
Y.-Y. Chien, National Taiwan Univ. (Taiwan)
K.-T. Wong, National Taiwan Univ. (Taiwan)


Published in SPIE Proceedings Vol. 5937:
Organic Light-Emitting Materials and Devices IX
Zakya H. Kafafi; Paul A. Lane, Editor(s)

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