Efficient LED-based illumination modules with high color rendering index

摘要

An illumination module includes a light mixing cavity with an interior surface area and window that are physically separated from an LED. A portion of the window is coated with a first wavelength converting material and a portion of the interior surface area is coated with a second wavelength converting material. The window may be coated with LuAG:Ce. The window may also be coated with a third wavelength converting material with a peak emission wavelength between 615-655 nm where the spectral response of light emitted from the window is within 20% of a blackbody radiator at the same CCT. The LED may emit a light that is converted by the light mixing cavity with a color conversion efficiency ratio greater than 130 lm/W where the light mixing cavity includes two photo-luminescent materials with a peak emission wavelengths between 508-528 nm and 615-655 nm.

主权项

1. An apparatus comprising:
at least one Light Emitting Diode (LED) operable to emit a first colored light characterized by an emission spectrum with a peak wavelength between 380 nanometers and 490 nanometers; and a primary light mixing cavity operable to convert the first colored light to a second colored light, wherein a portion of the primary light mixing cavity that is physically separated from the at least one LED includes a first photo-luminescent material with a peak emission wavelength between 508 and 528 nanometers and a second photo-luminescent material with a peak emission wavelength between 615 and 655 nanometers, wherein a spectral response of the second colored light is within 20% of a blackbody radiator of the same correlated color temperature for wavelengths between 500 and 650 nanometers.