OPTICAL DESIGNS FOR HIGH-EFFICACY WHITE-LIGHT EMITTING DIODES
First Claim
1. A white light emitting diode (WLED), comprising:
- a light emitting diode (LED) for emitting primary light;
a secondary emitting species, optically coupled to the LED, for emitting secondary light having a wavelength different than a wavelength of the primary light; and
at least one optically functional interface between the secondary emitting species and the LED, wherein the optically functional interface is at least partially transparent for the primary light and the optically functional interface is at least partially reflective for the secondary light.
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Abstract
A method for increasing the luminous efficacy of a white light emitting diode (WLED), comprising introducing optically functional interfaces between an LED die and a phosphor, and between the phosphor and an outer medium, wherein at least one of the interfaces between the phosphor and the LED die provides a reflectance for light emitted by the phosphor away from the outer medium and a transmittance for light emitted by the LED die. Thus, a WLED may comprise a first material which surrounds an LED die, a phosphor layer, and at least one additional layer or material which is transparent for direct LED emission and reflective for the phosphor emission, placed between the phosphor layer and the first material which surrounds the LED die.
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Citations
19 Claims
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1. A white light emitting diode (WLED), comprising:
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a light emitting diode (LED) for emitting primary light; a secondary emitting species, optically coupled to the LED, for emitting secondary light having a wavelength different than a wavelength of the primary light; and at least one optically functional interface between the secondary emitting species and the LED, wherein the optically functional interface is at least partially transparent for the primary light and the optically functional interface is at least partially reflective for the secondary light. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A method for fabricating a white light emitting diode (WLED), comprising:
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providing a light emitting diode (LED) for emitting primary light; providing a secondary emitting species, optically coupled to the LED, for emitting secondary light having a wavelength different than a wavelength of the primary light; and providing at least one optically functional interface between the secondary emitting species and the LED, wherein the optically functional interface is at least partially transparent for the primary light and the optically functional interface is at least partially reflective for the secondary light.
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19. A method for emitting white light, comprising:
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emitting primary light from a light emitting diode (LED); emitting secondary light from a secondary emitting species optically coupled to the LED, wherein the secondary light has a wavelength different than a wavelength of the primary light; and transmitting the primary light through, and reflecting the secondary light from, at least one optically functional interface positioned between the secondary emitting species and the LED, wherein the optically functional interface is at least partially transparent for the primary light and the optically functional interface is at least partially reflective for the secondary light.
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Specification