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

Jen-Wei Huang; Shih Jung Bai

doi:10.1117/12.589757

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7 March 2005 Light-emitting diode of fully conjugated heterocyclic aromatic rigid-rod polymer doped with multi-wall carbon nanotube

Jen-Wei Huang, Shih Jung Bai

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Proceedings Volume 5739, Light-Emitting Diodes: Research, Manufacturing, and Applications IX; (2005) https://doi.org/10.1117/12.589757
Event: Integrated Optoelectronic Devices 2005, 2005, San Jose, California, United States

Abstract

Poly-p-phenylenebenzobisoxazole (PBO) and carbon nanotube (CNT) contain fully conjugated rodlike backbone entailing excellent mechanical properties, thermo-oxidative and solvent resistance. Rigid-rod PBO is commonly processed by dissolved in methanesulfonic acid or Lewis acid. A CNT of multi-wall carbon nanotube (MWNT) was dissolved in a Lewis acid solution of PBO for dispersion of nanotube, and then spun for thin film. MWNT concentration in the films was from zero up to 5 wt.%. Compared to that of pure PBO film, all PBO/MWNT composite films retained same but enhanced UV-Vis absorption peaks showing that MWNT and PBO do not have overlapping electron orbitals affecting their energy gaps. The composite films were excited at 325 nm using a He-Cd laser for photoluminescence (PL) response. All PL spectra had maximum wavelength peak at 540 nm indicative of yellow-green light emission. In the case of light emitting diodes, MWNT doped PBO would decrease threshold voltage for about 2 V and increase device emission current up two orders of magnitude than those without MWNT. This required a larger bias voltage leading to a shorter device lifetime.

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Jen-Wei Huang and Shih Jung Bai "Light-emitting diode of fully conjugated heterocyclic aromatic rigid-rod polymer doped with multi-wall carbon nanotube", Proc. SPIE 5739, Light-Emitting Diodes: Research, Manufacturing, and Applications IX, (7 March 2005); https://doi.org/10.1117/12.589757

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