Study of organic light emitting devices (OLEDs) with optimal emission efficiency

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    The external emission efficiency of organic light emitting devices (OLEDs) is analysed by studying the rate of spontaneous emission of both singlet and triplet excitons and their corresponding radiative lifetimes. Rates of spontaneous emissions are calculated from the first order perturbation theory using the newly discovered timedependent spin-orbit-exciton-photon interaction operator as the perturbation operator. It is clearly shown how the new interaction operator is responsible for attracting triplet excitons to a phosphor (heavy metal atom) and then it flips the spins to a singlet configuration. Thus, the spin forbidden transition becomes spin allowed. Calculated rates agree with the experimental results qualitatively. Results are of general interests for OLED studies. � 2010 Wiley-VCH Verlag GmbH & Co. KGaA.
    Original languageEnglish
    Pages (from-to)984-987
    Number of pages4
    JournalPhysica Status Solidi (C) Current Topics in Solid State Physics
    Issue number3-4
    Publication statusPublished - 2010


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