System and method for selected pump LEDs with multiple phosphors
First Claim
Patent Images
1. An optical device comprising:
- a mounting member;
at least one light emitting diode (LED) provided overlying a portion of the mounting member;
the at least one LED including a gallium and nitrogen containing substrate having;
a surface region characterized by a polar crystallographic orientation and a dislocation density less than 1×
107 dislocations/cm2;
a junction region comprising an active region, the active region being configured to emit electromagnetic radiation within a range from 405 to 430 nanometers; and
a first electrical contact region and a second electrical contact region coupled to the junction region to supply electrical current capable of causing the active region to emit the electromagnetic radiation; and
a mixture of phosphor materials including a first phosphor material, a second phosphor material, and a third phosphor material within a binder material, the mixture of phosphor materials disposed within a vicinity of the at least one LED and configured to interact with the electromagnetic radiation to substantially convert the electromagnetic radiation within the wavelength range from 405 nm to 430 nm to wavelengths within a range from 440 nm to 650 nm;
wherein the first phosphor material comprises a blue phosphor characterized by peak absorption in a wavelength range from 405 nm to 430 nm and has an internal quantum efficiency of at least 70%; and
wherein the optical device emits substantially white light.
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Abstract
An LED pump light with multiple phosphors is described. LEDs emitting radiation at violet and/or ultraviolet wavelengths are used to pump phosphor materials that emit other colors. The LEDs operating in different wavelength ranges are arranged to reduce light re-absorption and improve light output efficiency.
169 Citations
25 Claims
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1. An optical device comprising:
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a mounting member; at least one light emitting diode (LED) provided overlying a portion of the mounting member;
the at least one LED including a gallium and nitrogen containing substrate having;a surface region characterized by a polar crystallographic orientation and a dislocation density less than 1×
107 dislocations/cm2;a junction region comprising an active region, the active region being configured to emit electromagnetic radiation within a range from 405 to 430 nanometers; and a first electrical contact region and a second electrical contact region coupled to the junction region to supply electrical current capable of causing the active region to emit the electromagnetic radiation; and a mixture of phosphor materials including a first phosphor material, a second phosphor material, and a third phosphor material within a binder material, the mixture of phosphor materials disposed within a vicinity of the at least one LED and configured to interact with the electromagnetic radiation to substantially convert the electromagnetic radiation within the wavelength range from 405 nm to 430 nm to wavelengths within a range from 440 nm to 650 nm; wherein the first phosphor material comprises a blue phosphor characterized by peak absorption in a wavelength range from 405 nm to 430 nm and has an internal quantum efficiency of at least 70%; and wherein the optical device emits substantially white light. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. An optical device comprising:
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at least one light emitting diode (LED) disposed over a portion of a mounting member;
the at least one LED having a gallium and nitrogen containing substrate with a surface region, wherein the surface region has a dislocation density less than 1×
107 dislocations/cm2;
a junction region including an active region, the active region emitting electromagnetic radiation within a range from 405 nanometers to 430 nanometers; and
a first electrical contact region and a second electrical contact region coupled to the junction region to supply electrical current to cause the active region to emit the electromagnetic radiation;a color conversion material disposed near the at least one LED, wherein the color conversion material comprises a blue phosphor characterized by peak absorption in the wavelength range from 405 nm to 430 nm, an internal quantum efficiency of at least 70% in said wavelength range, the active region is configured to emit the electromagnetic radiation within a range from 405 nanometers to 430 nanometers while reducing at least a piezoelectric field influence to cause the active region to output at least 100 Amps/centimeter2 and to maintain an internal quantum efficiency of at least about 70%, and a temperature ranging from about 85°
C. to about 150°
C.; and
wherein the electromagnetic radiation is substantially free from wavelengths less than 405 nanometers and greater than 440 nanometers;
wherein,leakage of the electromagnetic radiation from the color conversion material is from about 4% to about 6%; and the optical device emits substantially white light. - View Dependent Claims (20, 21, 22, 23, 24, 25)
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Specification