SOLID-STATE LAMPS WITH COMPLETE CONVERSION IN PHOSPHORS FOR RENDERING AN ENHANCED NUMBER OF COLORS
First Claim
1. A lighting source, having a predetermined correlated color temperature, comprising:
- a light emitter including an ultraviolet light-emitting diode generating a flux that is completely absorbed and converted to other wavelengths by a set of phosphors, each phosphor having a primary color, peak wavelength, and bandwidth, and with the peak wavelengths and relative fluxes generated by the set of phosphors being selected such that in comparison with a reference lighting source, when each of more than fourteen test color samples resolved by an average human eye as different is illuminated;
(a) chromaticity shifts with a chromatic adaptation of human vision taken into account are preserved within corresponding regions of a chromaticity diagram, each containing all colors that are indistinguishable, to the average human eye, from a color at a center of the region; and
(b) lightness shifts are preserved within predetermined values.
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Abstract
The invention relates to phosphor-conversion (PC) sources of white light, which are composed of at least two groups of emitters, such as ultraviolet (UV) light-emitting diodes (LEDs) and wide-band (WB) or narrow-band (NB) phosphors that completely absorb and convert the flux generated by the LEDs to other wavelengths, and to improving the color quality of the white light emitted by such light sources. In particular, embodiments of the present invention describe new 2-4 component combinations of peak wavelengths and bandwidths for white PC LEDs with complete conversion. These combinations are used to provide spectral power distributions that enable lighting with a considerable portion of a high number of spectrophotometrically calibrated colors rendered almost indistinguishably from a blackbody radiator or daylight illuminant, and which differ from distributions optimized using standard color-rendering assessment procedures based on a small number of test color samples.
112 Citations
21 Claims
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1. A lighting source, having a predetermined correlated color temperature, comprising:
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a light emitter including an ultraviolet light-emitting diode generating a flux that is completely absorbed and converted to other wavelengths by a set of phosphors, each phosphor having a primary color, peak wavelength, and bandwidth, and with the peak wavelengths and relative fluxes generated by the set of phosphors being selected such that in comparison with a reference lighting source, when each of more than fourteen test color samples resolved by an average human eye as different is illuminated; (a) chromaticity shifts with a chromatic adaptation of human vision taken into account are preserved within corresponding regions of a chromaticity diagram, each containing all colors that are indistinguishable, to the average human eye, from a color at a center of the region; and (b) lightness shifts are preserved within predetermined values. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A lighting method, comprising:
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generating white light, having a predetermined correlated color temperature, using a light emitter, the light emitter comprising an ultraviolet light-emitting diode generating a flux that is completely absorbed and converted to other wavelengths by a set of phosphors, each phosphor having a primary color, peak wavelength, and bandwidth, and with the peak wavelengths and relative fluxes generated by the set of phosphors being selected such that in comparison with a reference lighting source, when each of more than fourteen test color samples resolved by an average human eye as different is illuminated; (a) chromaticity shifts with a chromatic adaptation of human vision taken into account are preserved within corresponding regions of a chromaticity diagram, each containing all colors that are indistinguishable, to the average human eye, from a color at a center of the region; and (b) lightness shifts are preserved within predetermined values.
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21. A method for generating white light having a predetermined correlated color temperature, comprising:
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selecting a light emitter including an ultraviolet light-emitting diode generating a flux that is completely absorbed and converted to other wavelengths by a set of phosphors, each phosphor having a primary color, peak wavelength, and bandwidth, and with the peak wavelengths and relative fluxes generated by the set of phosphors being selected such that in comparison with a reference lighting source, when each of more than fourteen test color samples resolved by an average human eye as different is illuminated; (a) chromaticity shifts with a chromatic adaptation of human vision taken into account are preserved within corresponding regions of a chromaticity diagram, each containing all colors that are indistinguishable, to the average human eye, from a color at a center of the region; and (b) lightness shifts are preserved within predetermined values.
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Specification