Light-emitting dies incorporating wavelength-conversion materials and related methods
View Patent ↗In accordance with certain embodiments, electronic devices feature a polymeric binder, a frame defining an aperture therethrough, and a semiconductor die (e.g., a light-emitting or a light-detecting element) suspended in the binder and within the aperture of the frame.
1. An illumination system comprising:
a substrate;
a plurality of spaced-apart conductive traces disposed on the substrate; and
disposed over the substrate, an illumination device comprising:
a polymeric binder,
suspended within the polymeric binder, a bare-die light-emitting element having (i) a first face, (ii) a second face opposite the first face, (iii) at least one sidewall spanning the first and second faces, and (iv) disposed on the first face of the light-emitting element, at least two spaced-apart contacts each electrically coupled to one of the conductive traces, and
a frame (i) having a bottom surface, (ii) having a top surface opposite the bottom surface, (iii) having a thickness spanning the top and bottom surfaces, and (iv) defining an aperture (a) extending fully through the thickness and (b) having a sidewall, the top surface of the frame surrounding the aperture,
wherein the light-emitting element is disposed within the aperture of the frame such that (i) the second face of the light-emitting element is opposite the bottom surface of the frame, and (ii) a bottom surface of the illumination device includes at least a portion of the first face of the light-emitting element.
2. The illumination system of claim 1 , wherein the polymeric binder has a top surface disposed over the second face of the light-emitting element.
3. The illumination system of claim 1 , wherein at least portions of the contacts protrude from the polymeric binder.
4. The illumination system of claim 1 , further comprising one or more additional light-emitting elements at least partially suspended within the polymeric binder.
5. The illumination system of claim 1 , wherein the light-emitting element comprises a light-emitting diode.
6. The illumination system of claim 1 , wherein the light-emitting element comprises active semiconductor layers that are not disposed on a semiconductor substrate.
7. The illumination system of claim 1 , further comprising a reflective layer over or within at least a portion of the polymeric binder.
8. The illumination system of claim 1 , further comprising an optical element positioned to receive light from the light-emitting element.
9. The illumination system of claim 1 , further comprising an insulating layer disposed over or on at least a portion of a surface of the frame.
10. The illumination system of claim 1 , wherein the frame comprises at least one of a semiconductor, a plastic, a polymer, a glass, a ceramic, or a metal.
11. The illumination system of claim 1 , wherein (i) at least a portion of the polymeric binder is transparent to a wavelength of light emitted by the light-emitting element, and (ii) the polymeric binder contains therein a light-scattering material that scatters the wavelength of light emitted by the light-emitting element.
12. The illumination system of claim 1 , wherein (i) at least a portion of the polymeric binder is transparent to a wavelength of light emitted by the light-emitting element, and (ii) the polymeric binder contains therein a wavelength-conversion material for absorption of at least a portion of light emitted from the light-emitting element and emission of converted light having a different wavelength, converted light and unconverted light emitted by the light-emitting element combining to form mixed light.
13. The illumination system of claim 1 , wherein the light-emitting element has a thickness greater than the thickness of the frame.
14. The illumination system of claim 1 , wherein the light-emitting element has a thickness less than the thickness of the frame.
15. The illumination system of claim 1 , wherein the frame has an exterior sidewall spanning the top and bottom surfaces of the frame, and at least a portion of the polymeric binder extends beyond the exterior sidewall of the frame.
16. The illumination system of claim 1 , wherein (i) at least a portion of the polymeric binder is transparent to a wavelength of light emitted by the light-emitting element, (ii) the polymeric binder contains therein a wavelength-conversion material for absorption of at least a portion of light emitted from the light-emitting element and emission of converted light having a different wavelength, converted light and unconverted light emitted by the light-emitting element combining to form mixed light, (iii) the frame has at least one sidewall spanning the top and bottom surfaces of the frame, (iv) at least a portion of the polymeric binder extends beyond the sidewall of the frame, and (v) at least a portion of the polymeric binder extending beyond the sidewall of the frame is reflective to a wavelength of light emitted by the wavelength-conversion material.
17. The illumination system of claim 1 , further comprising at least one of an active or passive electronic component disposed over or on the bottom surface of the frame.
18. The illumination system of claim 1 , wherein the frame comprises a semiconductor material, and further comprising at least one of an active or passive electronic component disposed within or on the semiconductor material.
19. The illumination system of claim 1 , wherein at least a portion of the sidewall of the aperture is reflective to a wavelength of light emitted by the light-emitting element.
20. The illumination system of claim 2 , wherein the top surface of the polymeric binder is curved.
21. The illumination system of claim 2 , wherein the top surface of the polymeric binder is substantially flat.
22. The illumination system of claim 12 , wherein at least a portion of the sidewall of the aperture is coated with a reflective coating having a reflectance greater than 80% to a wavelength of light emitted by the light-emitting element and/or the wavelength-conversion material.
23. The illumination system of claim 12 , wherein the polymeric binder comprises a plurality of discrete regions, at least one of which comprises the polymeric binder without wavelength-conversion material therein.
24. The illumination system of claim 12 , wherein the mixed light is substantially white light.
25. The illumination system of claim 23 , wherein the polymeric binder comprises (i) disposed over at least a portion of the light-emitting element, a first region comprising wavelength-conversion material, and (ii) disposed over at least a portion of the first region, a second region free of wavelength-conversion material.
26. The illumination system of claim 24 , wherein the substantially white light has a correlated color temperature in the range of 2000 K to 10,000 K.
27. The illumination system of claim 24 , wherein a maximum divergence of color uniformity of the substantially white light in terms of the radially averaged Δu′v′ deviation from a spatially weighted average chromaticity is less than 0.01 over an angular range of 0° to 80°.
28. The illumination system of claim 24 , wherein a divergence of color temperature of the substantially white light emitted from the device varies, over an angular range of 0° to 80°, no more than 0.006 in terms of Δu′v′ deviation from a spatially weighted averaged chromaticity.
29. The illumination system of claim 15 , wherein the polymeric binder covers at least a portion of the exterior sidewall of the frame.
30. The illumination system of claim 15 , wherein at least a portion of the polymeric binder extending beyond the sidewall of the frame is reflective to a wavelength of light emitted by the light-emitting element.
31. The illumination system of claim 19 , wherein the at least a portion of the sidewall of the aperture has a reflectance greater than 80% to a wavelength of light emitted by the light-emitting element.