Light emitter devices
View Patent ↗Light emitter devices for light emitting diodes (LED chips) and related methods are disclosed. In one embodiment a light emitter device includes a substrate and a chip on board (COB) array of LED chips disposed over the substrate. A layer having wavelength conversion material provided therein is disposed over the array of LED chips for forming a light emitting surface from which light is emitted upon activation of the LED chips. In some aspects, the wavelength conversion material includes phosphoric or lumiphoric material that is settled and/or more densely concentrated within one or more predetermined portions of the layer. In some aspects, the devices and methods provided herein can comprise a lumen density of approximately 30 lm/mm 2 or greater.
1. A light emitter device comprising:
a substrate;
an emission area comprising an array of light emitting diode (LED) chips disposed over a planar surface of the substrate; and
a layer of material disposed over the array of LED chips, the layer comprising a non-uniform distribution of one or more wavelength conversion materials provided therein; and
the device having a lumen density of at least 30 lm/mm 2 or more.
2. The device of claim 1 , wherein the device comprises a lumen density of at least 60 lm/mm 2 or more.
3. The device of claim 1 , wherein the device comprises a lumen density of at least 90 lm/mm 2 or more.
4. The device of claim 1 , wherein a packing density of the LED chips over a floor of the emission area is between approximately 25% and 50%.
5. The device of claim 1 , wherein the emission area comprises a diameter of approximately 6 mm or more.
6. The device of claim 1 , wherein the emission area comprises a diameter of approximately 9 mm or more.
7. The device of claim 1 , wherein the emission area comprises a diameter of approximately 19 mm or more.
8. The device of claim 1 , wherein the wavelength conversion material comprises phosphor for converting light emitted by at least one LED chip to a peak wavelength in a red color.
9. The device of claim 1 , wherein the wavelength conversion material comprises phosphor for converting light emitted by at least one LED chip to a peak wavelength in a yellow color.
10. The device of claim 1 , wherein the wavelength conversion material comprises phosphor for converting light emitted by at least one LED chip to a peak wavelength in a green color.
11. The device of claim 1 , wherein a higher density of wavelength conversion material is provided proximate a bottom of the layer, and wherein a lower density of wavelength conversion material is provided proximate a top of the layer.
12. The device of claim 1 , comprising two or more wavelength conversion materials provided in the layer.
13. The device of claim 1 , wherein the layer comprises silicone encapsulant.
14. The device of claim 1 , wherein a retention dam is provided about the emission area.
15. The device of claim 1 , wherein the substrate comprises ceramic.
16. The device of claim 1 , wherein the array of LED chips is arranged in multiple different patterns.
17. The device of claim 1 , wherein each LED chip in the array of LED chips is configured to emit a same color of light.
18. The device of claim 1 , wherein at least two LED chips in the array of LED chips are configured to emit different colors of light.
19. The device of claim 1 , wherein each LED chip in the array of LED chips is spaced apart from a next closest LED chip by at least approximately 50 μm or more.
20. The device of claim 1 , wherein each LED chip in the array of LED chips is spaced apart from a next closest LED chip by at least approximately 200 μm or more.
21. The device of claim 1 , wherein each LED chip in the array of LED chips is spaced apart from a next closest LED chip by at least approximately 300 μm or more.
22. A light emitter device comprising:
a substrate;
an emission area comprising an array of light emitting diode (LED) chips disposed over the substrate; and
a layer of material disposed over the array of LED chips, the layer comprising a non-uniform distribution of wavelength conversion material provided therein; and
wherein the array of LED chips occupies approximately 25% or more of the light emission area.
23. The device of claim 22 , wherein the device comprises a lumen density of at least 30 lm/mm 2 or more.
24. The device of claim 22 , wherein the device comprises a lumen density of at least 60 lm/mm 2 or more.
25. The device of claim 22 , wherein the device comprises a lumen density of at least 90 lm/mm 2 or more.
26. The device of claim 22 , wherein the emission area comprises a diameter of approximately 6 mm or more.
27. The device of claim 22 , wherein the emission area comprises a diameter of approximately 9 mm or more.
28. The device of claim 22 , wherein the emission area comprises a diameter of approximately 19 mm or more.
29. The device of claim 22 , wherein the wavelength conversion material comprises a phosphor for converting light emitted by at least one LED chip to a peak wavelength in a red color, a yellow color, a green color, a blue color, a white color, or combinations thereof.
30. The device of claim 22 , wherein the amount of wavelength conversion material gradually increases towards a floor of the emission area.
31. The device of claim 22 , wherein the layer comprises silicone encapsulant.
32. The device of claim 22 , wherein a retention dam is provided about the emission area.
33. The device of claim 22 , wherein the substrate comprises ceramic.
34. The device of claim 22 , wherein chip spacing between two adjacent LED chips in the array of LED chips is approximately 50 μm or more.
35. The device of claim 22 , wherein chip spacing between two adjacent LED chips in the array of LED chips is approximately 200 μm or more.
36. The device of claim 22 , wherein chip spacing between two adjacent LED chips in the array of LED chips is approximately 300 μm or more.