Fotogeração, migração e dissociação do éxciton em filmes de Polifluorenos (amorfos e ordenados) próximos de interface orgânica/inorgânica

Valente, Gustavo Targino

doi:10.11606/d.88.2012.tde-18012013-115348

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References 29 publications

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“…Os resultados de microscopia confocal para o filme ultrafino de PFO produzido a partir da solução de 0,6 g/L estão apresentados na Figura 4.3. A área da amostra avaliada possui uma área de 2048x2408 pixel (objetiva de 20x, abertura numérica de 1,4) e utilizou-se um intervalo de varredura de 0,66 m, tempo de aquisição por pixel de 6,3 s e escala de 16 bits na qual há 216 tonalidades para cada componente da imagem na composição RGB (vermelho, verde e azul). Utilizou-se o laser de diodo em 405 nm para excitar o filme de PFO próximo em sua região espectral de maior eficiência.…”

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Dinâmica de éxcitons e transporte de cargas em heteroestruturas orgânicas

Valente¹

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In this study the exciton migration, energy transfer and charge transport in ultrathin organic heterostructure formed by semiconductor polymer and chlorophyll molecules were investigated. The energetic tuning between these materials promotes organic heterostructures with energetic modulation capable of trapping excitons and charges showing an application potential in Organic Light Emitting Diodes (OLEDS). Amorphous polyfluorenes (PFO) and chlorophyll a (chla) were prepared using self-assembly combined with spin-coating methods and characterized by confocal laser scanning microscopy and spectroscopic techniques. Photophysical processes were investigated using confocal and lifetime microscopy and the results interpreted from the model of Förster energy combined with the Miller-Abrahams rate as well as the exciton diffusion equation. These results provided a relationship between the exciton migration in the PFO film and the non-radiative energy transfer from polymer to chla molecules. An efficient transfer of energy equal to 94% was observed. Method of the Monte Carlo simulation were implemented to investigate the charge transport in this disordered organic system. Using this method, the charge dynamics with and no potential well layer was studied. Electrical properties obtained, such as electric mobility and diffusion coefficient, are in agreement with literature. It was estimated a charge fill rate in the potential well equal to 10 10 holes/s for 1 MV/cm and this parameter increases with the electric field. This approach has been shown to be an interesting alternative for the experimental design of OLEDs composed by organic heterostructure.

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Dinâmica de éxcitons e transporte de cargas em heteroestruturas orgânicas

Valente¹

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Fotogeração, migração e dissociação do éxciton em filmes de Polifluorenos (amorfos e ordenados) próximos de interface orgânica/inorgânica

Cited by 1 publication

References 29 publications

Dinâmica de éxcitons e transporte de cargas em heteroestruturas orgânicas

Dinâmica de éxcitons e transporte de cargas em heteroestruturas orgânicas

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