The possibility of varying the optical properties of materials in a controlled fashion constitutes an appealing objective, which represents the necessary starting point for the development of those advanced technologies designated to exploit the energy of the luminous radiation into a desirable way. Usually, in electrochromic, thermochromic or photochromic processes, the reversible switching of the material absorbance or reflectance in the UV-vis-NIR spectrum is accompanied by reversible variations of the material chemical composition. This is followed by mostly redox, dimerization or isomerization reactions which are induced by temperature changes or slowly and rapidly variable electric fields. Other means of varying the optical properties of materials are offered by nonlinear optical (NLO) processes in which the intensity of the light modifies absorptive and refractive properties of the irradiated material within the limits of its photochemical stability (photochromic effect). Among various nonlinear optical phenomena, the optical limiting (OL) effect represents an important one for its possible exploitation in the protection of light-sensitive elements which must operate below a safety threshold of light intensity. In the present contribution, the optical limiting effect generated by different classes of phthalocyanine-based materials is described and analyzed in terms of those molecular features which are associated with the better optical limiting performances. (C) 2003 Elsevier B.V. All rights reserved.

Phthalocyanines and related compounds as switchable materials upon strong irradiation: the molecular engineering behind the optical limiting effect / Dini, Danilo; M., Barthel; T., Schneider; M., Ottmar; S., Verma; M., Hanack. - In: SOLID STATE IONICS. - ISSN 0167-2738. - ELETTRONICO. - 165:1-4(2003), pp. 289-303. (Intervento presentato al convegno 5th International Meeting on Electrochromism (IME-5) tenutosi a GOLDEN, COLORADO nel AUG 05-09, 2002) [10.1016/j.ssi.2003.08.046].

Phthalocyanines and related compounds as switchable materials upon strong irradiation: the molecular engineering behind the optical limiting effect

DINI, DANILO;
2003

Abstract

The possibility of varying the optical properties of materials in a controlled fashion constitutes an appealing objective, which represents the necessary starting point for the development of those advanced technologies designated to exploit the energy of the luminous radiation into a desirable way. Usually, in electrochromic, thermochromic or photochromic processes, the reversible switching of the material absorbance or reflectance in the UV-vis-NIR spectrum is accompanied by reversible variations of the material chemical composition. This is followed by mostly redox, dimerization or isomerization reactions which are induced by temperature changes or slowly and rapidly variable electric fields. Other means of varying the optical properties of materials are offered by nonlinear optical (NLO) processes in which the intensity of the light modifies absorptive and refractive properties of the irradiated material within the limits of its photochemical stability (photochromic effect). Among various nonlinear optical phenomena, the optical limiting (OL) effect represents an important one for its possible exploitation in the protection of light-sensitive elements which must operate below a safety threshold of light intensity. In the present contribution, the optical limiting effect generated by different classes of phthalocyanine-based materials is described and analyzed in terms of those molecular features which are associated with the better optical limiting performances. (C) 2003 Elsevier B.V. All rights reserved.
2003
axial ligand; conjugated macrocycle; excited-state absorption; nonlinear optics; optical limiting; phthalocyanine
01 Pubblicazione su rivista::01a Articolo in rivista
Phthalocyanines and related compounds as switchable materials upon strong irradiation: the molecular engineering behind the optical limiting effect / Dini, Danilo; M., Barthel; T., Schneider; M., Ottmar; S., Verma; M., Hanack. - In: SOLID STATE IONICS. - ISSN 0167-2738. - ELETTRONICO. - 165:1-4(2003), pp. 289-303. (Intervento presentato al convegno 5th International Meeting on Electrochromism (IME-5) tenutosi a GOLDEN, COLORADO nel AUG 05-09, 2002) [10.1016/j.ssi.2003.08.046].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/134905
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