Studies of MEH-PPV and MEH-PPV/MCMB Films and their Light Absorption in the Red Wavelength Region of the Visible Spectrum

Kamarulzaman, Norlida; Rusdi, Roshidah; Aziz, Nor Diyana Abdul

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Paper Title:

Studies of MEH-PPV and MEH-PPV/MCMB Films and their Light Absorption in the Red Wavelength Region of the Visible Spectrum

Periodical	Advanced Materials Research (Volume 545)
Main Theme	Advancement of Materials and Nanotechnology II
Edited by	Norlida Kamarulzaman
Pages	308-311
DOI	10.4028/www.scientific.net/AMR.545.308
Citation	Nor Diyana Abdul Aziz et al., 2012, Advanced Materials Research, 545, 308
Online since	July, 2012
Authors	Nor Diyana Abdul Aziz, Roshidah Rusdi, Norlida Kamarulzaman
Keywords	MEH-PPV Film, Optical Band Gap, UV-Vis NIR
Price	US$ 28,-

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Abstract

Poly [2-methoxy, 5-(2-ethyl-hexyloxy)-p-phenylene-vinylene] (MEH-PPV) is a conjugated polymer that exhibit excellent luminescence properties in the visible spectrum. The fundamental absorption edge in the film is formed by the direct allowed transitions. In this work, free-standing films of MEH-PPV and MEH-PPV/MCMB were obtained by a solvent casting method. Mesocarbon Microbead (MCMB), a type of carbon, is added to the polymer producing composite films. The films were characterized by using the UV-Vis-NIR spectrophotometer. The film samples exhibited an absorption band in the red visible region. This is due to the electron transition between the non-localized bands. However, when MCMB is doped into the polymer matrix, the band absorption edge is red-shifted compared to that of the MEH-PPV pure film. Therefore, the optical band gaps of the composite films have decreased due to the presence of MCMB.