Lighting fixtures using solid state device and remote phosphors to produce white light

摘要

The present subject matter utilizes solid state sources to pump remote phosphors positioned within lighting fixtures to facilitate visible light illumination application in a region or area to be inhabited by a person. One or more phosphors are remotely positioned in a chamber of a lightguide element, which in some examples, substantially fills an optical volume of the fixture. The chamber includes a solid liquid or gas material for bearing the one or more phosphors. Multiple phosphors, for example, may together produce light in the fixture output that is at least substantially white and has a color rendering index (CRI) of 75 or higher.

主权项

1. A lighting fixture, comprising:
a macro reflector including a diffusely reflective surface forming an optical volume; an optical aperture for emission of visible light out of the fixture to facilitate a visible light illumination application in a region or area to be inhabited by a person; a lightguide element substantially filling the optical volume; a solid state source coupled to the lightguide element and configured to emit electromagnetic energy into the lightguide element, the solid state source comprising a semiconductor chip, an internal reflector, a housing and a light transmissive part, the housing and the light transmissive part together forming a package with the chip and the internal reflector enclosed within the package, wherein the macro reflector and the lightguide element are outside the package of the solid state source; a sealed chamber formed within the lightguide element external to and at a distance from the package of the solid state source and coupled to receive electromagnetic energy from the solid state source through at least a portion of the lightguide element; a material contained in and at least substantially filling the sealed chamber; and at least one remote phosphor, external to the package of the solid state source and dispersed in the material contained in the chamber, at a location for excitation by the electromagnetic energy from the solid state source, each phosphor having an absorption spectrum encompassing an emission spectrum of the solid state source for emitting visible light into the optical volume, wherein the macro reflector is positioned to receive at least some of the emitted visible light from the lightguide element and integrate the emitted visible light within the optical volume for output by way of the optical aperture.