25 September 2009 Energy and charge transfer in polymers as seen by spectrally resolved thermoluminescence
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Proceedings Volume 7487, Optical Materials in Defence Systems Technology VI; 748707 (2009); doi: 10.1117/12.835912
Event: SPIE Security + Defence, 2009, Berlin, Germany
Abstract
Several applications of the thermoluminescence (TL) technique for investigations of mechanisms of charge carrier trapping and recombination in electroluminescent polymers which are used for construction of various opto-electronic devices are described. The presented TL studies were focused on polymers emitting blue light, because such emissive materials are requested to realize the white-light-emitting OLEDs or RGB-displays. We have investigated wide band-gap conjugated polymers and also non-conjugated polymers: series of polyfluorenes (homo- and copolymers) and poly(9- vinylcarbazole), neat and doped with low-molecular-weight dopants. The dopants were introduced in order to improve the charge carrier transport and also the to modify the recombination processes. It is shown, that the spectrally resolved thermoluminescence studies, especially when performed in a broad temperature range allow to characterise the nature of the trapping sites and of the recombination centres and to identify the mechanisms responsible for transfer of energy in the investigated materials.
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Ireneusz Glowacki, Beata Luszczynska, Ewa Dobruchowska, Jacek Ulanski, "Energy and charge transfer in polymers as seen by spectrally resolved thermoluminescence", Proc. SPIE 7487, Optical Materials in Defence Systems Technology VI, 748707 (25 September 2009); doi: 10.1117/12.835912; http://dx.doi.org/10.1117/12.835912
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KEYWORDS
Polymers

Chromophores

Organic light emitting diodes

Temperature metrology

Electroluminescence

Electron transport

Luminescence

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