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Non-linear luminescence of dimethylaminobenzylidene-1,3-indandione solids

✍ Scribed by G. Kodis; V. Gulbinas; L. Valkūnas; S. Juršėnas

Publisher
John Wiley and Sons
Year
1996
Tongue
English
Weight
288 KB
Volume
6
Category
Article
ISSN
1616-301X

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✦ Synopsis

The origin of the non-linear anti-Stokes luminescence effect in dimethylaminobenzylidene-l,3indandione (DMABI) crystals, i.e. the luminescence in the visible spectral region created by infrared excitation, was investigated by means of ultrafast pump-probe and luminescence spectroscopy. In contrast with the previously proposed luminescence excitation model based on low-energy exciton annihilation, the luminescence state was found to be excited via two- photon absorption through virtual and real (characterised by 1 ps lifetime) intermediate states. Second-harmonic generation and pulse duration effects on the non-linear luminescence are discussed. Exciton-exciton annihilation on the manifold of luminescent states was observed at high excitation intensities.

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