Synthesis and characterization of organic light-emitting polymers = 유기 발광 고분자의 합성 및 발광 특성에 관한 연구

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We investigated electroluminescent (EL) characteristics of polymer and low molecular organic light emitting diodes. We synthesized new polymers and low molecular organic light emitting material containing oxadiazole unit or bis-styryl units. The synthesized polymers and low molecular organic light emitting material were soluble in common organic solvents and showed good thermal stability. A series of electroluminescent π-conjugated polymers containing an oxadiazole group in the backbone, poly[(2,5-bis(5-hexyloxyphenyl)-1,3,4-oxadiazole)-2,2-diylvinylene-alt-1,4-phenylenevinylene] (POOXPV), poly[(2,5-bis(2-hexyloxyphenyl)-1,3,4-oxadiazole)-5,5-diylvinylene-alt-1,4-phenylenevin-ylene] (PMOXPV) and poly[(2,5-diphenyl-1,3,4-oxadiazole)-2,4-diylvinylene-alt-1,4-(2,5-dihexyloxy)-phenylenevinylene] (PPOXPV), were prepared through Heck’s coupling or Wittig’s condensation reaction. The maximum photoluminescence (PL) wavelengths of POOXPV, PMOXPV and PPOXPV appeared at 495 nm, 470 nm, and 510 nm, respectively. The electroluminescence (EL) spectra of POOXPV and PPOXPV showed maximum peaks at 500 nm and 510 nm, respectively, corresponding to greenish-blue light, with the single-layer light-emitting diodes of Al/polymer/ITO glass fabricated. To obtain high intense emissive light devices and to investigate electron-transporting ability, the POOXPV was blended with poly[2-methoxy-5-(2-ethylhexyloxy)-1,4-phenylenevinylene] (MEH-PPV) and 4-(dicyanomethylene)-2-methyl-6-[p-(dimethylamin)styryl]-4H-pyran (DCM). The maximum brightness of the Al/(MEH-PPV/POOXPV=1:5)/ITO single-layer device was 2,400 cd/㎡. And compared with 2-(4-biphenylyl)-5-(4-t-butylphenyl)-1,3,4-oxadiazole (PBD) (well known as electron-transporting material), synthesized polymers are also believed to serve as an excellent polymer electron-transporting materials in our devices. We also synthesized two new fully conjugated alternating copolymers containing both oxadiazole and carbazole (or fluorene) units throug...
Advisors
Shim, Hong-Kuresearcher심홍구researcher
Description
한국과학기술원 : 화학과,
Publisher
한국과학기술원
Issue Date
2001
Identifier
165639/325007 / 000975179
Language
eng
Description

학위논문(박사) - 한국과학기술원 : 화학과, 2001.2, [ vi, 129 p. ]

Keywords

oxadiazole unit; polymer; electroluminescence; ppv derivatives; ppv 유도체; 옥사다이아졸기; 고분자; 전기발광

URI
http://hdl.handle.net/10203/31546
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=165639&flag=dissertation
Appears in Collection
CH-Theses_Ph.D.(박사논문)
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