ISSN:
1057-9257
Keywords:
dimethylaminobenzylidene-1,3-indandione
;
solids
;
non-linear luminescence
;
exciton-exciton annihilation
;
pump-probe and luminescence spectroscopy
;
Chemistry
;
Polymer and Materials Science
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Electrical Engineering, Measurement and Control Technology
,
Physics
Notes:
The origin of the non-linear anti-Stokes luminescence effect in dimethylaminobenzylidene-1, 3-indandione (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.
Additional Material:
3 Ill.
Type of Medium:
Electronic Resource
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