Prof. Shih Jung Bai Profile

Prof. Shih Jung Bai

at National Sun Yat-Sen Univ

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Publications (3)

Proceedings Article | 7 March 2005 Paper

Light-emitting diodes of non-fully conjugated coil-like copolymers for tunable emission and carbon nanotube effect

Shih Jung Bai, Chien-Chang Wu, Yi-Long Hsu

Proceedings Volume 5739, (2005) https://doi.org/10.1117/12.589750

KEYWORDS: Light emitting diodes, Electroluminescence, Absorption, Polymers, Composites, Carbon nanotubes, Luminescence, Organic light emitting diodes, Quartz, Visible radiation

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Non-fully conjugated 6F-PBO graft copolymers of poly(A_m-co-B_(1-m)) with poly[2,2-(m-2-hydroxyl-phenylene)- 4-4’-hexafluoroisopropane-bibenzoxazoles] (A_m) and poly[2,2-(1,4-didecylhydroxyl-phenylene)-4-4’-hexafluoroisopro-pane-bibenzoxazoles] (B_(1-m)) were synthesized with molar fraction m from 0, 0.25, 0.5, 0.75 to 1. The 6F-PBO random copolymers had identical benzoxazole with trifluoromethyl-ethyl as the backbone and pendants of mono-hydroxl (6F-PBO-OH, A_m) and/or di-decyloxyl (6F-PBO-di(OC₁₀H₂₁), B_(1-m)) on their phenylene rings. The copolymers were investigated by ultraviolet-visible (UV-Vis) light absorption covering 185 nm to 800 nm and photoluminescence (PL) emission excited at 363 nm. The PL exhibited a chromatic tuning range from green to white emission as m decreased. Light emitting devices (LEDs) of Al/copolymer/indium-tin-oxide were fabricated. A threshold voltage of 6 V was achieved for all 6F-PBO copolymer LEDs. The photometric coordinates of their electroluminescence (EL) emission were from (0.25, 0.53) to (0.24, 0.31) covering a visible range including white light emission. Another non-fully conjugated coil-like copolymer of poly(A_m-co-C_(1-m)) with 6F-PBO-OH (A_m) and poly[2,2’-(2-hydroxy-o-phenylene)- 5,5’-bibenzimidazole] (Pbi-OH, C_(1-m)) were synthesized and fabricated into LEDs. UV-Vis showed superposition of individual absorption from the 6F-PBO-OH and the Pbi-OH components. The PL and the EL had a red shift with increasing Pbi-OH content seemed to suggest that Pbi-OH was more charge delocalized than 6F-PBO-OH. PL and EL showed a green emission which was not tunable according to m. The threshold voltages were about at 2 ~ 3 V. Composites of poly(A_m-co-C_(1-m)) and multi-wall carbon nanotube (MWNT) were in situ synthesized for dispersion of the nanotubes. Few MWNT aggregations were observed via scanning electron microscope. The threshold voltages were 2 ~ 5 V. There was a red shift with MWNT addition in the PL and the EL but remained a green emission. Thus, up to 2 wt.% of MWNT was inconsequential on the PL and the EL emissions of the copolymer poly(A_m-co-C_(1-m)).

Proceedings Article | 7 March 2005 Paper

Light-emitting diode of fully conjugated heterocyclic aromatic rigid-rod polymer doped with multi-wall carbon nanotube

Jen-Wei Huang, Shih Jung Bai

Proceedings Volume 5739, (2005) https://doi.org/10.1117/12.589757

KEYWORDS: Light emitting diodes, Polymers, Absorption, Carbon nanotubes, Electroluminescence, Luminescence, Optoelectronics, Composites, Quartz, Transmission electron microscopy

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Proceedings Article | 14 May 2001 Paper

Luminescence of thin films of conjugated rigid-rod polymer PBT

Li-Wei Tu, K. Lee, Chih-Ming Lai, S. Bai, C. Wu

Proceedings Volume 4278, (2001) https://doi.org/10.1117/12.426849

KEYWORDS: Polymers, Luminescence, Electroluminescence, Absorption, Light emitting diodes, Electrodes, Aluminum, Thin films, Polymer thin films, Scanning electron microscopy

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