The device has a piece (3) integrated with a reflector (2), and supporting an optically active fluorescent zone that is intended to be illuminated by a light source, which is a diode (5) that emits ultra violet light. The active fluorescent zone has coatings disposed on a surface of the piece, and converts a part of the light at range of wavelengths into light at another range of wavelengths in a visible range. An IDEPENDENT CLAIM is also included for a vehicle equipped with an automobile headlamp comprising a signaling device.
