We implemented and developed a number of different mechanical patterning methods, including soft hot embossing, rapid prototyping, sub-µm fluidics, high-temperature and room-temperature nanoimprinting lithography, to fabricate planar periodic structures based on organic materials. Patterns were faithfully transferred to many different organic compounds, including polymers, low-molar-mass compounds, and blends, up to 100-nm scale resolution. Lithography does not reduce the emission yields of light-emitting organic compounds, thus opening the way to the one-step realization of organic-based confined optoelectronic devices. We carefully investigated the possible changes in the optical properties (absorbance, luminescence, and quantum yield) of light-emitting species, thus ruling out any possible degradation of the active materials after patterning. In particular, the observed increase in the external luminescence yield is ascribed to the reduced self-absorption within the dielectric slab of the organic film, as a consequence of the pattern-induced enhanced forward scattering.

Novel nanofabrication techniques of organic optical cavities

PISIGNANO, DARIO
2004

Abstract

We implemented and developed a number of different mechanical patterning methods, including soft hot embossing, rapid prototyping, sub-µm fluidics, high-temperature and room-temperature nanoimprinting lithography, to fabricate planar periodic structures based on organic materials. Patterns were faithfully transferred to many different organic compounds, including polymers, low-molar-mass compounds, and blends, up to 100-nm scale resolution. Lithography does not reduce the emission yields of light-emitting organic compounds, thus opening the way to the one-step realization of organic-based confined optoelectronic devices. We carefully investigated the possible changes in the optical properties (absorbance, luminescence, and quantum yield) of light-emitting species, thus ruling out any possible degradation of the active materials after patterning. In particular, the observed increase in the external luminescence yield is ascribed to the reduced self-absorption within the dielectric slab of the organic film, as a consequence of the pattern-induced enhanced forward scattering.
Pisignano, Dario
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11568/886093
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