The role of triplet states in the emission mechanism of polymer light-emitting diodes

    Authors

    M. Arif; S. Mukhopadhyay; S. Ramasesha;S. Guha

    Comments

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    Abbreviated Journal Title

    Epl

    Keywords

    ELECTROLUMINESCENCE; SPECTRA; FILMS; POLYFLUORENE; MOLECULES; BAND; Physics, Multidisciplinary

    Abstract

    The blue emission of polyfluorene (PF)-based light-emitting diodes (LEDs) is known to degrade due to a low-energy green emission, which hitherto has been attributed to oxidative defects. By studying the electroluminescence (EL) from ethyl-hexyl substituted PF LEDs in the presence of oxygen and in an inert atmosphere, and by using trace quantities of paramagnetic impurities (PM) in the polymer, we show that the triplet states play a major role in the low-energy emission mechanism. Our time-dependent many-body studies show a large cross-section for the triplet formation in the EL process in the presence of PM, primarily due to electron-hole recombination processes. Copyright (C) EPLA, 2009

    Journal Title

    Epl

    Volume

    87

    Issue/Number

    5

    Publication Date

    1-1-2009

    Document Type

    Article

    Language

    English

    First Page

    5

    WOS Identifier

    WOS:000270146600027

    ISSN

    0295-5075

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