Emission properties of thin films of electroactive doped polymers |
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Authors: | A V Kukhto É É Kolesnik A L Gurskii E V Lutsenko K A Osipov V N Pavlosvskii Yu V Grazulyavichyus A Nedelcheva I K Grabchev |
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Institution: | (1) Institute of Molecular and Atomic Physics, National Academy of Sciences of Belarus, 70 prosp. Nezavisimosti, Minsk, 220072;(2) B. I. Stepanov Institute of Physics, National Academy of Sciences of Belarus, Minsk;(3) Kaunas University of Technology, Lithuania;(4) Polymer Institute, Bulgarian Academy of Sciences, Sofia |
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Abstract: | We have studied the effect of the intensity of the exciting radiation and the temperature on the emission properties of two
kinds of thin-film samples based on blends of two types of organic electroactive materials: polyfluorene + iridium triphenylpyridinate
and polyepoxypropylcarbazole + zero-th order PAMAM dendrimer with eosin. We have shown that an increase in the excitation
intensity leads to an increase in the intensity of the luminescence of the polymer matrices and the iridium complex up to
a power density of 300 kW/cm2, and the emission of the dendrimer is rapidly saturated and does not return to the initial value when the excitation level
decreases. Heating up to 170°C followed by cooling causes an increase in the intensity for all the components except the dendrimer.
The data obtained show that annealing is an important method for improving the emission efficiency of the proposed thin-film
structures, due to a change in the packing of the activator molecules in the polymer matrix leading to more efficient transfer
of the excitation energy. Molecules of the studied dendrimer are not stable when exposed to optical radiation and temperature.
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Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 74, No. 6, pp. 820–825, November–December, 2007. |
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Keywords: | polymer/molecule blend thin film luminescence temperature excitation power |
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