Raman Scattering Spectroscopy for Historical Incandescent Lamps with a Carbon Filament, Hg-free HID Lamps and OLEDs

Abstract

We have observed three kinds of Raman scattering spectra for the following materials: (1) the bamboo-based carbon filaments inside historical incandescent lamps fabricated by Ichisuke Fujioka and Thomas A. Edison, whose results were compared with those of a bamboo-based carbon filament annealed in our laboratory and a broken filament extracted from the incandescent lamp, which has been preserved for over a hundred years by our company; (2) iodine deposited inside a Hg-free high-intensity discharge (HID) lamp after arc discharge in a xenon (Xe) atmosphere, and (3) the variation in the spectra for PEDOT (poly(3,4-ethylenedioxythiophene)) doped with PSS (polystyrene sulfonate) and the PEDOT:PSS electro chemically dedoped. A shift in the D-band owing to defects was found to be 52 cm − 1 /eV for the bamboo-based carbon filament extracted from the incandescent lamp. The spectrum of iodine deposited inside the Hg-free HID lamp exhibited an erratic intensity progression with an overtone of more than 20, and this behavior was considered to be due to the resonance fluorescence of the gaseous iodine sublimated after the irradiation of laser light.