LIGHT-EMITTING SYSTEMS

摘要

A light-emitting system comprises a rare earth-containing organic light-emitting device (10, 11, 12, 13) fabricated on a silicon-based substrate (1). The light-emitting device is associated with a resonant cavity which may be in the form of a ridge or buried ridge waveguide (6). A diode (27) may form a modulator region (26) for injection of free carriers into the waveguide. This changes the refractive index or local absorption of the resonant cavity and thus allows switching of the system. The system is preferably a laser operating at about 1.5 mu m although other wavelengths may be used. The wavelength is selected by the rare earth used.