Light emission properties of poly(diphenylsilylenemethylene) and poly(diphenylsiloxane) by UV laser irradiation

Unique light emission phenomena of poly(diphenylsilylenemethylene) (PDPhSM) and poly(diphenylsiloxane) (PDPhSO) by UV laser irradiation were observed. When PDPhSM films were irradiated with an excimer laser (KrF, 248 nm), light emission, whose spectra were broad ranging from 300–500 nm and exhibiting a large peak at 340 nm, was observed. Blue-green light emission was observed for several seconds, after the laser light was turned off. Furthermore, the emission spectra were found to change with a number of laser shots irradiated. The emission peak at 340 nm decreased rapidly, while the emission in the range from 400–600 nm increased gradually as the sample was repeatedly irradiated with the laser. A similar characteristic light emission was also observed with PDPhSO films.