Abstract: An illumination device includes first and second solid, wedge-shaped waveguides and first and second light-emitting diodes (LEDs) positioned to couple light into the waveguides. Mixed light is emitted from (i) at least a portion of the first surface of the first waveguide and/or (ii) at least a portion of the first surface of the second waveguide, the mixed light including light emitted by the first LED and light emitted by the second LED.

Abstract: In accordance with certain embodiments, illumination systems incorporate light-emitting diodes emitting light of different colors, as well as one or more phosphor materials, which may be engineered for the emission of light of different optical properties such as correlated color temperature. For example, phosphor materials may be interchanged or adjusted in thickness and/or intensity, and/or the relative light-emission intensities of different light-emitting diodes may be adjusted for control of the emitted light. Illumination systems may also be configured to improve areal uniformity of light emitted from solid waveguides or combinations of waveguides.

Abstract: An illumination device includes a solid waveguide; a plurality of light emitting diodes emitting light of different colors and arranged to project light into at least one of the surfaces of the waveguide; and one or more phosphor materials for converting light emitted by one of the LEDs from one color to another, such that an out-coupling region of the waveguide outputs a mixture of light from at least some of the LEDs and light converted by the phosphors materials.

Abstract: In accordance with certain embodiments, illumination systems incorporate light-emitting diodes emitting light of different colors, as well as one or more phosphor materials, which may be engineered for the emission of light of different optical properties such as correlated color temperature. For example, phosphor materials may be interchanged or adjusted in thickness and/or intensity, and/or the relative light-emission intensities of different light-emitting diodes may be adjusted for control of the emitted light. Illumination systems may also be configured to improve areal uniformity of light emitted from solid waveguides or combinations of waveguides.