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J Chem Phys. 2008 Jul 28;129(4):041103. doi: 10.1063/1.2961010.

A direct approach to study radiative emission from triplet excitations in molecular semiconductors and conjugated polymers.

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  • 1Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, California 94720, USA and Hahn-Meitner-Institut-Berlin, Kekulestr. 5, 12489 Berlin, Germany.


Using the recently discovered time-dependent spin-orbit-photon interaction operator and first order perturbation theory, the rate of spontaneous emission from triplet excitations is derived within the two-level approximation for organic molecular solids and conjugated polymers. The calculated rates and corresponding radiative lifetimes agree very well with the known experimental results. Present results are compared with those obtained through the traditional approach of the second order perturbation theory in some molecular crystals and found to be in better agreement with experiments.

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