High luminous efficacy phosphor converted white LEDs
AssigneeBridgelux, Inc.
InventorsGang Wang, Yi-Qun Li
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Abstract
A white light emitting device comprises: an LED that generates excitation light of wavelength from 420 nm to 480 nm; and photoluminescence materials that generate light with a peak emission wavelength from 500 nm to 650 nm comprising a broadband phosphor, and a manganese-activated narrowband red fluoride phosphor with a peak emission wavelength from 628 nm to 640 nm and a full width at half maximum of less than 30 nm. The device generates white light with a selected color temperature from 2200K to 6500K, a General Color Rendering Index, CRI Ra, of at least 80, and a Duv (Delta u, v) from 0.0060 to 0.0170 for the selected color temperature and wherein the device has an LER (Luminous Efficacy of Radiation) of at least 320 lm/Wopt.
Claims19
A white light emitting device comprising:
- an LED for generating excitation light of wavelength from 420 nm to 480 nm;
- and
- photoluminescence materials for generating light with a peak emission wavelength from 500 nm to 650 nm comprising a broadband phosphor, and a manganese-activated narrowband red fluoride phosphor with a peak emission wavelength from 628 nm to 640 nm and a full width at half maximum of less than 30 nm;
- wherein the device is for generating white light with a selected color temperature from 2200K to 6500K, a General Color Rendering Index, CRI Ra, of at least 80, and a CIE 1976 Duv from 0.0060 to 0.0170 for the selected color temperature;
- and
- wherein the device has an LER (Luminous Efficacy of Radiation) of at least 320 lm/Wopt.
A white light emitting device comprising:
- an LED for generating excitation light of wavelength from 420 nm to 480 nm;
- and
- photoluminescence materials for generating light with a peak emission wavelength from 500 nm to 650 nm comprising a broadband phosphor, and a manganese-activated narrowband red fluoride phosphor with a peak emission wavelength from 628 nm to 640 nm and a full width at half maximum of less than 30 nm;
- wherein the device is for generating white light with a selected color temperature from 2200K to 6500K, a General Color Rendering Index, CRI Ra, of at least 80, and a CIE 1976 Duv from 0.0060 to 0.0170 for a selected color temperature;
- and
- wherein the device has an OLE (Overall Luminous Efficacy) of at least 210 lm/Wdc.
An LED-filament comprising:
- an at least partially light transmissive substrate having a front face;
- a linear array of LED chips on the front face of the substrate for generating excitation light of wavelength from 420 nm to 480 nm;
- and
- photoluminescence materials for generating light with a peak emission wavelength from 500 nm to 650 nm comprising a broadband phosphor, and a manganese-activated narrowband red fluoride phosphor with a peak emission wavelength from 628 nm to 640 nm and a full width at half maximum of less than 30 nm;
- wherein the LED-filament is for generating white light with a selected color temperature from 2200K to 6500K, a General Color Rendering Index, CRI Ra, of at least 80, and a CIE 1976 Duv from 0.0060 to 0.0170 for the selected color temperature and wherein the device has an OLE (Overall Luminous Efficacy) of at least 210 lm/Wdc.
Dependencies are inferred from the claim text.