Back to results
US 9,648,673 B2Granted
Lighting device with spatially segregated primary and secondary emitters
AssigneeCree, Inc.
InventorsPaul Kenneth Pickard, Gerald H. Negley
Life of this patent
Estimating the term…
Abstract
A lighting device includes at least one first electrically activated emitter, at least one lumiphor support element comprising a lumiphoric material spatially segregated from the first electrically activated emitter and arranged to receive at least a portion of emissions from the first electrically activated emitter, and at least one second electrically activated emitter disposed on or adjacent to the at least one lumiphor support element. First and second electrically activated emitters having different peak wavelengths may be in conductive with first and second device-scale heat sinks, respectively.
Claims53
A lighting device comprising:
- at least one first electrically activated emitter supported by a substrate or submount;
- at least one lumiphor support element comprising a lumiphoric material, wherein the at least one lumiphor support element is spatially segregated from the at least one first electrically activated emitter and the substrate or submount, and is arranged to receive at least a portion of emissions from the at least one first electrically activated emitter;
- and
- at least one second electrically activated emitter supported by the at least one lumiphor support element;
- wherein the lighting device comprises at least one of the following features (i) to (vii):
- (i) the at least one lumiphor support element comprises a material having a thermal conductivity of at least 25 W/(m·° K) at about 25° C. and a transmittance of at least about 80%;
- (ii) a first device-scale heat sink is in conductive thermal communication with the at least one first electrically activated emitter, a second device-scale heat sink is in conductive thermal communication with the at least one second electrically activated emitter, and each of the first device-scale heat sink and the second device-scale heat sink is exposed to an ambient environment external to the lighting device;
- (iii) a first device-scale heat sink is in conductive thermal communication with the at least one first electrically activated emitter, a second device-scale heat sink is in conductive thermal communication with the at least one second electrically activated emitter, and at least one of the first device-scale heat sink and the second device-scale heat sink comprises a material having a thermal conductivity of at least 25 W/(m·° K) at about 25° C. and a transmittance of at least about 80%;
- (iv) an optical element is positioned between the at least one first electrically activated emitter and the at least one second electrically activated emitter, and is arranged to inhibit light emitted by the at least one second electrically activated emitter from being incident upon the at least one first electrically activated emitter;
- (v) the at least one lumiphor support element comprises an inner surface proximate to the at least one first electrically activated emitter and comprises an outer surface distal from the at least one first electrically activated emitter, wherein the at least one second electrically activated emitter is disposed on or over the outer surface of the at least one lumiphor support element;
- (vi) the lumiphoric material is arranged to output emissions including a peak wavelength in a range of from 560 nm to 595 nm;
- or
- (vii) the at least one first electrically activated emitter is not in conductive thermal communication with the at least one second electrically activated emitter.
10 more elements
A lighting device comprising:
- at least one first electrically activated emitter having at least one first peak wavelength;
- a first device-scale heat sink in conductive thermal communication with the at least one first electrically activated emitter;
- at least one second electrically activated emitter having at least one second peak wavelength;
- and
- a second device-scale heat sink in conductive thermal communication with the at least one second electrically activated emitter;
- wherein the lighting device comprises at least one of the following features (i) to (vi):
- (i) at least one of the first device-scale heat sink and the second device-scale heat sink comprises a material having a thermal conductivity of at least 25 W/(m·° K) at about 25° C. and a transmittance of at least about 80%;
- (ii) the lighting device comprises a lumiphor support element that includes a lumiphoric material, and the lumiphor support element comprises an inner surface proximate to the at least one first electrically activated emitter and comprises an outer surface distal from the at least one first electrically activated emitter, wherein the at least one second electrically activated emitter is disposed on or over the outer surface of the lumiphor support element;
- (iii) the lighting device comprises a lumiphor support element that includes a lumiphoric material, and the lumiphor support element comprises a material having a thermal conductivity of at least 25 W/(m·° K) at about 25° C. and a transmittance of at least about 80%;
- (iv) the lighting device comprises a lumiphor support element that includes a lumiphoric material, and the lumiphoric material is arranged to output emissions including a peak wavelength in a range of from about 560 nm to 595 nm;
- (v) each of the first device-scale heat sink and the second device-scale heat sink is exposed to an ambient environment external to the lighting device;
- or
- (vi) an optical element is positioned between the at least one first electrically activated emitter and the at least one second electrically activated emitter, and is arranged to inhibit light emitted by the at least one second electrically activated emitter from being incident upon the at least one first electrically activated emitter.
10 more elements
Dependencies are inferred from the claim text.