標題: Synthesis and characterization of poly(fluorene)-based copolymers containing various 1,3,4-oxadiazole pendants
作者: Sung, HH
Lin, HC
材料科學與工程學系
Department of Materials Science and Engineering
關鍵字: carbazole;glass-forming property;mesomorphism;oxadiazole (OXD);pendant;poly(fluorene)
公開日期: 1-七月-2005
摘要: A series of soluble alternating poly(fluorene)-based copolymers containing electron-transporting 1,3,4-oxadiazole (OXD) and hole-transporting carbazole pendants attached to the C-9 position of fluorene units by long alkyl spacers were synthesized. These copolymers possess mesogenic and nomnesogenic pendants attached to a rigid mesogenic poly(fluorene) (PF) backbone. All these polymers exhibit glass-forming liquid crystalline properties, including the nematic and smectic A (SmA) phases, and reveal much wider mesophasic temperature ranges than that of PF. The thermal properties and mesomorphism of these conjugated polymers are mainly affected by the nature of these pendants, and thus the mesophasic temperature ranges and glass-forming properties are greatly enhanced by introducing the OXD pendants. In addition, the tendencies of crystallization and aggregation of PF are also suppressed by introducing the OXD pendants. A single layer device with P4 as an emitter shows a turn-on voltage of 5 V and a bright luminescence of 2694 cd/m(2) at 11 V with a 2 power efficiency of 1.28 cd/A at 100 mA/cm(2). (c) 2005 Wiley Periodicals, Inc.
URI: http://dx.doi.org/10.1002/pola.20741
http://hdl.handle.net/11536/13520
ISSN: 0887-624X
DOI: 10.1002/pola.20741
期刊: JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY
Volume: 43
Issue: 13
起始頁: 2700
結束頁: 2711
顯示於類別:期刊論文


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