Color-tunable transmission mode active phosphor based on III-nitride nanowire grown on transparent substrate

A white light generation system comprising:

• a transparent substrate having a first surface and a second surface;
• a plurality of nanowires-based LEDs grown on a first surface of the transparent substrate and emitting light away from the first surface;
• and
• at least one external light source positioned away from the transparent substrate and with light from said at least one external light being directed toward the second surface and through the transparent substrate and exiting the first surface and then combining with light from the plurality of nanowires-based LEDs to produce a white light being emitted away from the first surface.

A method of white light generation comprising:

• emitting light from a plurality of nanowires-based light emitting devices LEDs epitaxially grown on a first side of a transparent substrate;
• directing light emitted from a secondary light source toward a second side of the transparent substrate opposite the first side, with at least some light from the secondary light source passing through the transparent substrate;
• and
• mixing light from the secondary light source that entered the transparent substrate at the second side and then passed through the transparent substrate with light from the plurality of nanowires-based LEDs to produce a white light combination being emitted away from the first surface.