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10 October 2012 Fluorescence and SHG in organic nanocrystals of DCNP
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Organic nanocrystals (ONCs) similarly to inorganic ones show interesting size effects. It has been already observed that their luminescence properties can be changed in terms of enhanced luminescence and spectral shift of fluorescence bands as compared to bulk materials. Usually these effects are observed for much larger size of nanoparticles from 50 nm up to 1000 nm. Noncentrosymmetric and fluorescent organic crystals are rare but particularly interesting as they exhibit both nonlinear optical properties like Second Harmonic Generation (SHG) and fluorescence. Such ONC's could serve as fluorescent and SHG probes for bio-imaging purposes simultaneously. This could be beneficial for situation in which the dynamics of ordering of biological systems has to be studied. Here, we report on 3-(1,1-dicyanoethenyl)-1-phenyl-4,5- dihydro-1H-pyrazole (DCNP) compound which forms nanocrystals, exhibits large shifts of fluorescence maximum with size and strong SHG signals. When embedded in polymeric or biopolymeric matrix DNA-CTMA shows efficient amplified spontaneous emission. The unique properties of this compound in its various forms from molecules, ONC's to macroscopic single crystals are studied and discussed.
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Andrzej Miniewicz, Krystyna Palewska, Paweł Karpinski, Lech Sznitko, and M. Zielinski "Fluorescence and SHG in organic nanocrystals of DCNP", Proc. SPIE 8464, Nanobiosystems: Processing, Characterization, and Applications V, 84640O (10 October 2012);

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