Optical devices having reflection mode wavelength material
View Patent ↗Techniques are disclosed for transmitting electromagnetic radiation such as ultra-violet, violet, blue, blue and yellow, and/or blue and green electromagnetic radiation, from LED devices fabricated on bulk semipolar or nonpolar materials and using phosphors. The substrate may include polar gallium nitride.
1. An optical device comprising:
a substrate member having an upper surface;
a light emitting diode (LED) device configured to emit light in a first selected wavelength range, the LED device mounted on the upper surface of the substrate member;
a reflective member surrounding the LED device, the reflective member comprising:
a dichroic reflection coating; and
a transparent dome;
a first wavelength-selective material disposed on the upper surface of the substrate member, an upper surface of the wavelength-selective material being below an upper surface of the LED device;
a second wavelength-selective material disposed on the upper surface of the substrate member; and
a third wavelength-selective material disposed on the upper surface of the substrate member;
wherein the first wavelength-selective material emits light in a second selected wavelength range in response to light at the first selected wavelength range emitted from the LED device; and
wherein the reflective member transmits substantially all of the light at the second selected wavelength range from the optical device.
2. The optical device of claim 1 , wherein the first selected wavelength range comprises a wavelength range from about 395 nm to about 430 nm.
3. The optical device of claim 1 , wherein the transparent dome forms a lens shape.
4. The optical device of claim 1 , wherein the transparent dome comprises an A-lamp dome.
5. The optical device of claim 1 , wherein the transparent dome comprises a component of an MR-16 lamp.
6. The optical device of claim 1 , wherein the first wavelength-selective material comprises a phosphor.
7. The optical device of claim 1 , wherein the second selected wavelength range comprises a wavelength range from about 440 nm to about 800 nm.
8. The optical device of claim 1 , wherein the second wavelength selective material absorbs light at the second wavelength and emits light at a third selected wavelength.
9. The optical device of claim 1 , wherein the first wavelength selective material, the second wavelength selective material, the third wavelength selective material, or a combination of any of the foregoing is disposed throughout a volume bounded by the transparent dome.
10. A method of fabricating an optical device comprising:
providing a substrate member having an upper surface;
providing a light emitting diode (LED) device configured to emit light in a first selected wavelength range, the LED device mounted on the upper surface of the substrate member;
providing a reflective member surrounding the LED device, the reflective member comprising:
a dichroic reflection coating; and
a transparent dome;
providing a first wavelength-selective material disposed on the upper surface of the substrate member around the LED device, an upper surface of the first wavelength-selective material being below an upper surface of the LED device;
providing a second wavelength-selective material disposed on the upper surface of the substrate member; and
providing a third wavelength-selective material disposed on the upper surface of the substrate member;
wherein the first wavelength-selective material emits light in a second selected wavelength range in response to light in a first selected wavelength range emitted from the LED device; and
wherein the reflective member transmits substantially all light at the second selected wavelength range e from the optical device.
11. The method of fabricating an optical device of claim 10 , comprising providing the first wavelength selective material, the second wavelength selective material, the third wavelength selective material, or a combination of any of the foregoing throughout a volume bounded by the transparent dome.
12. The method of fabricating an optical device of claim 10 , wherein each of the first wavelength selective material, the second wavelength selective material, and the third wavelength selective material is independently selected from a ceramic particle phosphor, a semiconductor particle phosphor, a ceramic plate phosphor, a semiconductor plate phosphor, an organic downconverter, an inorganic downconverter, an up converter, a quantum dot, and a nano-particle.
13. The method of fabricating an optical device of claim 10 , wherein the first selected wavelength range comprises a wavelength range of about 395 nm to about 430 nm.
14. The method of fabricating an optical device of claim 10 , wherein the transparent dome forms a lens shape.
15. The method of fabricating an optical device of claim 10 , wherein the transparent dome comprises an A-lamp dome.
16. The method of fabricating an optical device of claim 10 , wherein the transparent dome comprises a component of an MR-16 lamp.
17. The method of fabricating an optical device of claim 10 , wherein the first wavelength-selective material comprises a phosphor.
18. The method of fabricating an optical device of claim 10 , wherein the second selected wavelength range comprises a wavelength range from about 440 nm to about 800 nm.
19. The optical device of claim 10 , wherein each of the first wavelength selective material, the second wavelength selective material, and the third wavelength selective material is independently selected from a ceramic particle phosphor, a semiconductor particle phosphor, a ceramic plate phosphor, a semiconductor plate phosphor, an organic downconverter, an inorganic downconverter, an up converter, a quantum dot, and a nano-particle.
20. The method of fabricating an optical device of claim 10 , wherein the second wavelength selective material absorbs light at the second wavelength and emits light at a third selected wavelength.