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Thermoluminescence and Photoluminescence Analyses of MEH-PPV, MDMO-PPV and RU(bpy)3 Gamma-Irradiated Polymer Thin Films

Thermoluminescence and Photoluminescence Analyses of MEH-PPV, MDMO-PPV and RU(bpy)3 Gamma-Irradiated Polymer Thin Films

A Ortiz-Morales, J Ortiz-Lopez, E Cruz-Zaragoza, R Gómez-Aguilar

Appl Radiat Isot. 2015 Aug;102:55-62.

PMID: 25980659

Abstract:

Effects of irradiation with (60)Co gamma photons on poly[2-methoxy-5-(2-ethylhexyloxy)-1,4-phenylenevinylene] (MEH-PPV), poly[2-methoxy-5-(3',7' dimethyloctyloxy)-1,4-phenylenevinylene] (MDMO-PPV) and tris(2,2'-bipyridyl)dichlororuthenium(II) hexahydrate (Ru(bpy)3) thin films were analyzed regarding their thermoluminescence (TL) and photoluminescence (PL) properties. A linear TL dose response was obtained from the MEH-PPV and MDMO-PPV polymer films in dose ranges of approximately 0.170-4.08kGy and 0.170-0.850kGy, respectively, followed by a supralinear behavior. A dependence on the conjugation length of the polymer chains which was favored by heating of the film, was observed, and irradiation generated a blue-shift in MEH-PPV and Ru(bpy)3. Furthermore, the PL structure was not modified. The most likely effect involved in the TL emission was trapping. The high activation energy values of the traps in the TL may be attributed in part to the binding energy of the exciton. A deconvolution process was carried out to obtain the kinetic parameters from the TL glow curves and PL spectra.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP177716595	MDMO-PPV		177716-59-5	Price

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