Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
9586242 | Journal of Luminescence | 2005 | 4 Pages |
Abstract
Random laser action and amplified spontaneous emission are observed near 425 nm in self-assembled para-sexiphenyl nanofibers following subpicosecond optical pumping. The threshold excitation fluence (photoexcited density) is as low as 0.5 μJ/cm2 (6Ã1016 cmâ3). The high degree of material crystallinity results in a very large singlet-singlet annihilation rate of â10â7 cm3/s. In stationary conditions, assuming a standard singlet-to-triplet density ratio of 0.3 and bimolecular recombination as the only density-dependent loss mechanism, the equivalent current density necessary for lasing threshold is estimated to be as low as 3 kA/cm2. The experimental findings suggest that such highly ordered molecular nanoaggregates have great potential as blue-emitting devices for integrated photonic applications.
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Authors
F. Quochi, A. Andreev, F. Cordella, R. Orrù, A. Mura, G. Bongiovanni, H. Hoppe, H. Sitter, N.S. Sariciftci,