Libero Zuppiroli

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Publications associées (50)

Trap-limited transport in rubrene transistors

Libero Zuppiroli, Marie-Noëlle Bussac, Steven Konezny

The charge carrier mobility in the transport channel of an organic transistor is estimated within the framework of a trap-and-release model. The model accounts for the observed dependence of the mobility on the dielectric constant "epsilon" of the gate ins ...

AIP American Institute of Physics2009

An ester-substituted iridium complex for efficient vacuum-processed organic light-emitting diodes

Michael Graetzel, Mohammad Khaja Nazeeruddin, Rosario Scopelliti, Libero Zuppiroli, Philippe Bugnon, Stéphane Suarez

An orange-red-emitting iridium complex (N958) was prepared, and its photophysical and device-based characteristics were investigated. Despite N958 displaying quite poor photophysical properties in solution (acetonitrile), organic light-emitting diode (OLED ...

2009

Quantum Yield Measurement of Fluorescent Zeolite Nanopigments

Libero Zuppiroli, Rolando Ferrini

Organic fluorescent molecules are infiltrated in the channels of zeolite L nanocrystals, thus creating organic-inorganic fluorescent nanoparticles. Combined with dielectric matrices, these fluorescent nanopigments open the way to the realization of novel o ...

Wiley-Blackwell2009

Local infiltration of planar photonic crystals with UV-curable polymers

Romuald Houdré, Libero Zuppiroli, Rolando Ferrini, Laurent Balet, Pascale El-Kallassi

We present the local polymer infiltration of planar photonic crystal cavities via a maskless laser-writing technique. After the infiltration of the air holes with a UV-curable monomer a focused laser is used to locally polymerize the monomer in selected ho ...

2008

Controlling charge-transfer at the gate interface of organic field-effect transistors

Libero Zuppiroli, Adrian von Mühlenen, Mauro Castellani

The performance and charge transport characteristics of pentacene transistors with oxide gates such as SiO2 and Al2O3 have been recently shown to largely depend on the density of residual carriers due to electron acceptor defects at the oxide surface. The ...

2008

Charge transport mechanisms in microcrystalline silicon

Libero Zuppiroli, Marie-Noëlle Bussac, Steven Konezny

A heterogeneous charge transport model for microcrystalline silicon based on fluctuation-induced tunneling is presented that fits the low-temperature saturation observed in dark conductivity measurements and accounts for the film microstructure. Excellent ...

AIP American Institute of Physics2008

Sublimation Not an Innocent Technique: A Case of Bis-Cyclometalated Iridium Emitter for OLED

Michael Graetzel, Mohammad Khaja Nazeeruddin, Rosario Scopelliti, Libero Zuppiroli, Philippe Bugnon, Stéphane Suarez

Isomerization of a neutral bis-cyclometalated iridium(III) complex has been observed for the first time during the preparation of vacuum-processed organic light-emitting devices (OLEDs) and reproduced in solution. Isolation of the isomer revealed a cis org ...

2008

Science et technologie comme auxiliaires d'une nouvelle violence

Libero Zuppiroli

Où l’on tente de montrer sur quelques exemples, qu’en déformant la réalité, la « technoscience » contribue à alimenter la logique de guerre économique et de guerre totale, tentation ultime d’un monde dirigé par le marché. Où l’on voit aussi qu’Hannah Arend ...

Editions L'Harmattan2008

Optisches Element und Verfahren zu seiner Herstellung (Optical element and methods for its fabrication)

Libero Zuppiroli, Rolando Ferrini

Applicant: ILFORD Imaging Switzerland GmbH; Designated countries: all; Filing date: September 12, 2008. ...

2008

Local tuning of the optical response of two-dimensional photonic crystals

Romuald Houdré, Libero Zuppiroli, Rolando Ferrini, Laurent Balet, Pascale El-Kallassi

Local tuning of the optical response of GaAs-based two dimensional photonic crystals (PhCs) is reported. A selective polymer infiltration technique was developed. Scanning electron microscopy and optical measurements were used to characterize the filled Ph ...

Eindhoven University of Technology2008

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2008

Controlling charge-transfer at the gate interface of organic field-effect transistors

Libero Zuppiroli, Adrian von Mühlenen, Mauro Castellani

2008