Multiple conversion material light emitting diode package and method of fabricating same

摘要

An emitter package comprising a light emitting diode (LED) emitting light at a wavelength within a wavelength range and a plurality of phosphors. Each of the phosphors absorbs at least some light from the LED and re-emits a different wavelength of light. The package emits a combination of light from the LED and the plurality of phosphors, with the phosphors having excitation characteristics such that the emitter package emits light within a standard deviation of a target color for LEDs emitting at the wavelengths with the wavelength range. A method for fabricating emitter packages comprising fabricating a plurality of LEDs, each of which emits at a wavelength within a range of wavelengths. Each of the LEDs are arranged in a respective package with a plurality of conversion materials so that at least some light from each of the LEDs is absorbed and re-emitted by its corresponding conversion materials. The plurality of conversion materials have excitation characteristics that compensate for different LED emission wavelengths within the LED range of wavelengths such that each of the LED packages emits light within a standard deviation from a target color.

主权项

1. An emitter package, comprising:
a plurality of light emitting diodes (LED) emitting light within a wavelength range, wherein said wavelength range width is at least 10 nm and up to 50 nm; a plurality of phosphors, said plurality of phosphors comprising at least two different phosphors, said at least two different phosphors having emission wavelengths and excitation characteristics such that a first of said phosphors has an increased excitation efficiency at longer wavelengths, within said wavelength range, compared to a second of said phosphors having a decreased excitation efficiency at the same longer wavelengths, each of which absorbs at least some light from said LED and re-emits a different wavelength of light, wherein the same plurality of phosphors is over at least two of said LEDs; and wherein said emitter package emits a combination of light from said LED and said plurality of phosphors, in which said package emission is within a 4-step MacAdam ellipse around a target color, regardless of variations in the wavelength emitted, within said wavelength range, from said LED.