Synthesis and Characterization of Novel Oxadiazole Containing Materials
碩士 === 國立交通大學 === 應用化學系 === 90 === A novel fluorene-based oxadiazole-containing polymer (PF-OXD, Part A.) and a series of fluorene derivatives (F-OXDs, Part B.) of high glass-transition temperature was successfully synthesized by introduction of bulky and rigid oxadiazole containing subst...
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ndltd-TW-090NCTU05000402015-10-13T10:06:55Z http://ndltd.ncl.edu.tw/handle/91034301297322532961 Synthesis and Characterization of Novel Oxadiazole Containing Materials 含有雙雜環材料的合成與性質研究 Fang-Iy Wu 吳芳奕 碩士 國立交通大學 應用化學系 90 A novel fluorene-based oxadiazole-containing polymer (PF-OXD, Part A.) and a series of fluorene derivatives (F-OXDs, Part B.) of high glass-transition temperature was successfully synthesized by introduction of bulky and rigid oxadiazole containing substituents at C-9 position of fluorene units. In Part A., PF-OXD possesses a very high Tg (213 °C) and very good thermal stability due to its rigid cardo-linkage. In contrast to POF, prolonged heating of PF-OXD thin film (150 °C for 20 h) resulted in no changes in morphology and emissive color. The luminance reaches 2770 cd/m2 at a drive voltage of 10.8 V and the maximum external quantum efficiency is 0.52 % with a bias of 7.4 V. The improved device performance over that of POF may be due to better charge injection and transport from PF-OXD and the efficient energy transfer from OXD side chain to the polyfluorene main chains. In Part B., those oxadiazole-containing small molecules F-OXDs are able to form stable glasses with higher glass transtion temperatures (128-155 ℃) and better thermal stabilities than 2-(4-diphenylyl)-5-(4-tert-butylphenyl)-1,3,4-oxadiazole (PBD). The alternated incorporation of OXD substituents in F-OXDs leads to the tunability of the HOMO/LUMO levels and energy band gaps. Cyclic voltammetry studies reveal that these small molecules possess low-lying LUMO energy levels ranging from 2.46 — 2.84 eV and wide energy band gaps and may be promising candidates as electron-transporting blue hosts. Ching-Fong Shu 許慶豐 2002 學位論文 ; thesis 103 zh-TW |
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碩士 === 國立交通大學 === 應用化學系 === 90 === A novel fluorene-based oxadiazole-containing polymer (PF-OXD, Part A.) and a series of fluorene derivatives (F-OXDs, Part B.) of high glass-transition temperature was successfully synthesized by introduction of bulky and rigid oxadiazole containing substituents at C-9 position of fluorene units.
In Part A., PF-OXD possesses a very high Tg (213 °C) and very good thermal stability due to its rigid cardo-linkage. In contrast to POF, prolonged heating of PF-OXD thin film (150 °C for 20 h) resulted in no changes in morphology and emissive color. The luminance reaches 2770 cd/m2 at a drive voltage of 10.8 V and the maximum external quantum efficiency is 0.52 % with a bias of 7.4 V. The improved device performance over that of POF may be due to better charge injection and transport from PF-OXD and the efficient energy transfer from OXD side chain to the polyfluorene main chains.
In Part B., those oxadiazole-containing small molecules F-OXDs are able to form stable glasses with higher glass transtion temperatures (128-155 ℃) and better thermal stabilities than 2-(4-diphenylyl)-5-(4-tert-butylphenyl)-1,3,4-oxadiazole (PBD). The alternated incorporation of OXD substituents in F-OXDs leads to the tunability of the HOMO/LUMO levels and energy band gaps. Cyclic voltammetry studies reveal that these small molecules possess low-lying LUMO energy levels ranging from 2.46 — 2.84 eV and wide energy band gaps and may be promising candidates as electron-transporting blue hosts.
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author2 |
Ching-Fong Shu |
author_facet |
Ching-Fong Shu Fang-Iy Wu 吳芳奕 |
author |
Fang-Iy Wu 吳芳奕 |
spellingShingle |
Fang-Iy Wu 吳芳奕 Synthesis and Characterization of Novel Oxadiazole Containing Materials |
author_sort |
Fang-Iy Wu |
title |
Synthesis and Characterization of Novel Oxadiazole Containing Materials |
title_short |
Synthesis and Characterization of Novel Oxadiazole Containing Materials |
title_full |
Synthesis and Characterization of Novel Oxadiazole Containing Materials |
title_fullStr |
Synthesis and Characterization of Novel Oxadiazole Containing Materials |
title_full_unstemmed |
Synthesis and Characterization of Novel Oxadiazole Containing Materials |
title_sort |
synthesis and characterization of novel oxadiazole containing materials |
publishDate |
2002 |
url |
http://ndltd.ncl.edu.tw/handle/91034301297322532961 |
work_keys_str_mv |
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