Phosphor thermometry

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Photosensitivity and luminescence of chromium and bismuth doped fibers

Optical fiber materials with broad-band gain in the visible or in the telecommunication window are of great interest for optical communication or the biomedical domain in order to built integrated tunable lasers, amplifiers, ultra-short pulse lasers, or br ...

EPFL2009

Biexciton kinetics in GaN quantum wells: Time-resolved and time-integrated photoluminescence measurements

Nicolas Grandjean, Jean-François Carlin, Eric Feltin, Raphaël Butté

We report on the experimental achievement of narrow ultraviolet excitonic and biexcitonic emission from GaN/AlGaN quantum wells. The very large biexciton binding energy (up to 12 meV) inhibits thermalization between the two species allowing to study the re ...

2008

Bow-tie optical antenna probes for single-emitter scanning near-field optical microscopy

Philippe Flückiger

A method for the fabrication of bow-tie optical antennas at the apex of pyramidal Si3N4 atomic force microscopy tips is described. We demonstrate that these novel optical probes are capable of sub-wavelength imaging of single quantum dots at room temperatu ...

2007

Bulk acoustic wave resonator operating at 8 GHz for gravimetric sensing of organic films

Paul Muralt, Samuel Rey-Mermet, Roman Lanz

The mass sensitivity of an AlN thin film resonators operated in air at 6-8 GHz has been investigated in theory and experiment. The 30 x 30 mu m wide resonators included a 180-300 nm thick, highly oriented AlN thin film, bottom and top electrode, and an aco ...

2006

Doping-induced charge trapping in organic light-emitting devices

Frank Nüesch, Libero Zuppiroli, Detlef Berner, Michel Schär

By using pyran-containing donor-acceptor dyes as doping molecules in organic light-emitting devices (OLEDs), we scrutinize the effects of charge trapping and polarization induced by the guest molecules in the electro-active host material. Laser dyes 4-(dic ...

Wiley-VCH2005

Fluorescence and phosphorescence from individual C-60 molecules excited by local electron tunneling

Majed Chergui, Wolf-Dieter Schneider, François Patthey, Marina Pivetta, Elizabeta Cavar

Using the highly localized current of electrons tunneling through a double barrier scanning tunneling microscope junction, we excite luminescence from a selected C60 mol. in the surface layer of fullerene nanocrystals grown on an ultrathin NaCl film on Au( ...

2005