Synthesis and characterization of liquid-crystalline alternating copolymers based on fluorene and thiophene = 액정성을 갖는 플루오렌-싸이오펜계 발광 고분자의 합성 및 발광 특성에 관한 연구

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New alternating conjugated copolymer (PFTT) comprised of 9,9´-dioctylfluorene and thienothiophene has been synthesized by palladium-catalyzed Suzuki coupling reaction. The synthesized polymer could be well characterized by $^1H-NMR, ^13C-NMR$, and elemental analysis. Not only did it show high thermal stability, but also PFTT displayed a unique phase transition behavior between crystalline state and liquid-crystalline (LC) state. In proof of its LC property, the film of polymer showed a birefringent fluid phase as annealed above its melting temperature ($T_Cr-LC$). In addition, owing to its relatively high characteristic temperatures, the fluorene-based copolymer PFTT is expected to be used as semiconducting layers in organic field-effect transistors (OFETs). Light-emitting diode (LED) device fabricated with ITO/PEDOT/PFTT/LiF/Al configuration revealed pure green light emission with a maximum EL peak at 515 nm. Such emission corresponded to the CIE coordinates (0.29, 0.63), which close to standard green used in national television system committee (NTSC). As the controlled HOMO and LUMO energy levels conduced toward enhanced hole and electron injection, PFTT exhibited high electroluminescent performances better than the other similar copolymer (e.g, PFT2), which demonstrated the superiority of PFTT in LEDs. New alternating conjugated copolymer (PFTT) comprised of 9,9´-dioctylfluorene and thienothiophene has been synthesized by palladium-catalyzed Suzuki coupling reaction. The synthesized polymer could be well characterized by $^1H-NMR, ^13C-NMR$, and elemental analysis. Not only did it show high thermal stability, but also PFTT displayed a unique phase transition behavior between crystalline state and liquid-crystalline (LC) state. In proof of its LC property, the film of polymer showed a birefringent fluid phase as annealed above its melting temperature ($T_Cr-LC$). In addition, owing to its relatively high characteristic temperatures, the...
Advisors
Shim, Hong-Kuresearcher심홍구researcher
Description
한국과학기술원 : 화학과,
Publisher
한국과학기술원
Issue Date
2003
Identifier
180062/325007 / 020013511
Language
eng
Description

학위논문(석사) - 한국과학기술원 : 화학과, 2003.2, [ iv, 43 p. ]

Keywords

Fluorene; Liquid-Crystallinity; Electroluminescence; Thiophene; 싸이오펜; 플루오렌; 액정성; 발광

URI
http://hdl.handle.net/10203/31951
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=180062&flag=dissertation
Appears in Collection
CH-Theses_Master(석사논문)
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