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Synthesis and optical properties of copolymers containing electron transporting 1,3,4-oxadiazole pendant groups

Author(s)
Wang, HuiRyu, Jeong-TakHan, Yoon SooHur, YoungjunePark, Lee SoonSong, MinhyeonKwon, Younghwan
Issued Date
2006-12
DOI
10.1080/15421400600930409
URI
https://scholarworks.unist.ac.kr/handle/201301/17127
Fulltext
http://www.tandfonline.com/doi/abs/10.1080/15421400600930409
Citation
MOLECULAR CRYSTALS AND LIQUID CRYSTALS, v.459, pp.109 - 118
Abstract
Well-defined copolymer, P(3,6-EHCZ-alt-MPAOXD), containing a triarylamine and N-alkylcarbazole groups (as hole transport moieties with blue emission) in the main chain and a 1,3,4-oxadiazole pendant group (as an electron transporting moiety) was synthesized by Pd-catalyzed polycondensation of N-(2-ethylhexyl)-3,6-dibromo carbazole with 2-methylphenyl-5-(4-aminophenyl)-1,3,4-oxadiazole. For comparison, P(3,6-EHCZ-alt-AL) containing a triarylamine and a carbazole groups in the main chain was also prepared. P(3,6-EHCZ-alt-AL) exhibited lambda(max,UV) at 309 nm and lambda(max,PL) in the range of blue emission at 452 nm. However, P(3,6-EHCZ-alt-MPAOXD) exhibited lambda(max,UV) at 283 nm with a new peak at 359 nm, and red-shifted PL emission at 506 nm, possibly attributed to the extended conjugation by 1,3,4-oxadiazole pendant group. The electrochemical results revealed that incorporation of 1,3,4-oxadiazole group in the polymer side chain provided a closely matched HOMO energy levels with hole-injecting PEDOT layer, and reduced the band gap energy level
Publisher
TAYLOR & FRANCIS LTD
ISSN
1542-1406
Keyword (Author)
hole transportN-alkylcarbazole1,3,4-oxadiazoletriarylamine
Keyword
LIGHT-EMITTING-DIODESCONJUGATED POLYMERSPOLY(N-VINYLCARBAZOLE)ELECTROLUMINESCENCEABILITIESHOLE

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