New coumarin type dyes for optical data recording

摘要

The present invention relates to new coumarin compounds and to their use as dyes in optical layers for optical data recording, preferably for optical data recording using a laser with a wavelength up to 450 nm. The invention further relates to an optical layer comprising said dyes and to a write only read many (WORM) type optical recording medium capable of recording and reproducing information with radiation of blue laser, which employs a coumarin type dye in the optical layer.