Abstract
Femtosecond infrared luminescence has been observed in bulk and nano-structured platinum. Very broad spectra ranging from 0.3 to 1.05 eV are ascribed to hot luminescence within metal like continuous states both in bulk and nano-structured Pt. In addition, an excitation power dependent lifetime was found in Pt nano-structures.
Highlights
Nanometer-sized metal structures especially those of noble metals are important for catalysts, tracers, plasmonic devices, etc
We present femtosecond luminescence in bulk Pt with a rough surface and Pt nanostructures, and discuss the electron relaxation dynamics
We examined the femtosecond IR luminescence in the bulk Pt
Summary
Nanometer-sized metal structures especially those of noble metals are important for catalysts, tracers, plasmonic devices, etc. Among them Au nano-spheres are most welldeveloped in applications, such as size-tunable luminescent material, luminescent tracer, imaging agent for cancer cells[1] and other biomedical applications[2]. A bright luminescence from Pt nano-particles with thiol ligands has been reported [3] and the possibility as a new nanoprobe for labelling and imaging of bio-molecules is discussed. Basic information such as luminescence mechanism or relaxation dynamics is not available even for bulk Pt. In this report, we present femtosecond luminescence in bulk Pt with a rough surface and Pt nanostructures, and discuss the electron relaxation dynamics
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