Phys. Rev. B 79, 073302 (2009) [4 pages]Temporal response of optically pumped organic semiconductor lasers and its implication for reaching threshold under electrical excitationReceived 17 December 2008; published 11 February 2009 We study the step response of optically pumped organic semiconductor lasers and find that lasing is sustained for <150 ns following pump turn on due to annihilation quenching of guest singlet with host triplet excitons. We derive a general criterion for reaching threshold that critically depends on the pump rise time, the singlet-triplet quenching rate, and the spin statistics of exciton formation. These results imply that singlet-triplet annihilation alone fundamentally restricts lasing by electrical excitation to conditions that are not practically feasible in organic semiconductors. © 2009 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevB.79.073302
DOI:
10.1103/PhysRevB.79.073302
PACS:
71.35.−y, 78.47.jc, 78.55.Kz, 78.66.Qn
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