Semiconductor lighting device with wavelength conversion on back-transferred light path
First Claim
1. A solid state lighting device comprising:
- a semiconductor light emitting component packaged on a reflective substrate, said semiconductor light emitting component emitting a primary first light;
a long pass dichroic filter disposed to receive said primary first light that is emitted from said semiconductor light emitting component, said long pass dichroic filter reflecting back at least 50% of said primary first light that is emitted from said semiconductor light emitting component;
a first wavelength down-conversion layer on said reflective substrate, said first wavelength down-conversion layer absorbing said reflected primary first light from said long pass dichroic filter, said reflected primary first light from said long pass dichroic filter exciting a forward second light from said first wavelength down-conversion layer;
a light diffuser member positioned on top of said long pass dichroic filter; and
a power line electrically connected to said semiconductor light emitting component.
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Abstract
A semiconductor lighting device includes a semiconductor light emitter packaged on a reflective substrate to emit a first light and a remote wavelength conversion layer on a back-transferred light path to convert the back-transferred first light into a forward second light. A filter is disposed on a light emitting forward path with a space to the semiconductor light emitter to reflect back at least a portion of the first light. A diffusive member may be positioned outside of the filter to diffuse the forward passing light before it exits from the semiconductor lighting device. As a second aspect of this invention, a solid state lighting device includes a short wavelength semiconductor emitter; a long wavelength semiconductor emitter with wavelength in reddish orange range; a filter on a light emitting forward path to reflect back a portion of short wavelength first light; and a wavelength conversion component on a back-transferred light path. The device produces a mixture of warm white light in a correlated color temperature from 2700˜3500 K and color rendering index at least 85 for any indoor lighting application.
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Citations
12 Claims
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1. A solid state lighting device comprising:
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a semiconductor light emitting component packaged on a reflective substrate, said semiconductor light emitting component emitting a primary first light; a long pass dichroic filter disposed to receive said primary first light that is emitted from said semiconductor light emitting component, said long pass dichroic filter reflecting back at least 50% of said primary first light that is emitted from said semiconductor light emitting component; a first wavelength down-conversion layer on said reflective substrate, said first wavelength down-conversion layer absorbing said reflected primary first light from said long pass dichroic filter, said reflected primary first light from said long pass dichroic filter exciting a forward second light from said first wavelength down-conversion layer; a light diffuser member positioned on top of said long pass dichroic filter; and a power line electrically connected to said semiconductor light emitting component. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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Specification