Illumination apparatus
An illumination apparatus, comprising at least one light emitting source embedded in a waveguide material is disclosed. The waveguide material is capable of propagating light generated by light emitting source(s), such that at least a portion of the light is diffused within the waveguide material and exits through at least a portion of its surface.
1. An illumination apparatus comprising:
a substantially planar waveguide;
at least one light source embedded within the waveguide,
wherein the waveguide (i) retains therein substantially all light emitted by the at least one embedded light source, and (ii) causes the light to propagate and diffuse within the waveguide until the light is caused to exit from an exit region of a surface thereof;
disposed over the exit region of the waveguide, at least one photoluminescent material for converting a wavelength of a portion of the light emitted by the at least one light source; and
a reflective material proximate a bottom surface of the waveguide.
2. The illumination apparatus of claim 1 , wherein unconverted light from the at least one light source mixes with light converted by the at least one photoluminescent material to produce substantially white light.
3. The illumination apparatus of claim 1 , wherein each said at least one light source is a bare die LED.
4. The illumination apparatus of claim 1 , wherein each said at least one light source is a packaged LED.
5. The illumination apparatus of claim 1 , wherein each said at least one light source is an organic LED.
6. The illumination apparatus of claim 1 , further comprising an optical element for redirecting at least a portion of the light emitted by the at least one light source out of the exit region.
7. The illumination apparatus of claim 6 , wherein the optical element comprises at least one of a plurality of impurities, one or more prisms, one or more gratings, one or more microlenses, or a non-smooth surface.
8. The illumination apparatus of claim 6 , wherein the optical element is spaced away from the at least one light source toward the exit region.
9. The illumination apparatus of claim 1 , wherein the exit region comprises a portion of a top surface of the waveguide displaced from the at least one light source.
10. The illumination apparatus of claim 1 , wherein the at least one light source is embedded proximate the bottom surface of the waveguide.
11. The illumination apparatus of claim 1 , wherein the at least one photoluminescent material is disposed only over the exit region of the waveguide.
12. The illumination apparatus of claim 1 , further comprising an encapsulation material disposed between the at least one light source and the waveguide.