Method of manufacturing light emitting device
View Patent ↗A light-emitting diode (“LED”) device has an LED chip attached to a substrate. The terminals of the LED chip are electrically coupled to leads of the LED device. Elastomeric encapsulant within a receptacle of the LED device surrounds the LED chip. A second encapsulant is disposed within an aperture of the receptacle on the elastomeric encapsulant.
1. A method of manufacturing a light-emitting diode (“LED”) device comprising:
die-attaching an LED chip to a first portion of a substrate;
electrically connecting a first terminal of the LED chip to a first lead of the LED device, wherein, said first lead extends from the substrate first portion;
dispensing uncured elastomeric encapsulant into a receptacle of the LED device through an aperture of the receptacle;
inserting the LED chip and substrate first portion through the aperture so as to surround the LED chip and the substrate first portion with elastomeric encapsulant; and
curing the elastomeric encapsulant.
2. The method of claim 1 further comprising, after said inserting the LED chip and substrate through the aperture:
dispensing a second encapsulant into the receptacle over the cured elastomeric encapsulant; and
curing the second encapsulant.
3. The method of claim 2 wherein the cured second encapsulant is harder than the cured elastomeric encapsulant.
4. The method of claim 3 wherein the cured second encapsulant seals the elastomeric encapsulant in the receptacle.
5. The method of claim 3 wherein the cured second encapsulant comprises a Shore Hardness greater than D70.
6. The method of claim 2 wherein the second encapsulant comprises a ceramic powder dispersed in an epoxy matrix.
7. The method of claim 1 wherein the elastomeric encapsulant comprises silicone encapsulant.
8. The method of claim 1 wherein said electrically connecting a first terminal of the LED chip to a first lead of the LED device comprises electrically connecting said first terminal to said first lead with a bond wire.
9. The method of claim 1 and further comprising:
electrically connecting a second terminal of the LED chip to a second lead of the LED device, wherein, said second lead extends from a second portion of the substrate.
10. The method of claim 9 and further comprising:
inserting the second portion of the substrate through the aperture so as to surround the second portion with the elastomeric encapsulant prior to curing the elastomeric encapsulant.
11. The method of claim 9 and further comprising:
cutting the first lead and the second lead to singulate the LED device from a leadframe strip.
12. The method of claim 10 , wherein the first lead is cut to a different length than the second lead.
13. The method of claim 1 and further comprising:
cutting the first lead to singulate the LED device from a leadframe strip.
14. The method of claim 1 wherein the elastomeric encapsulant has a first index of refraction and forms a primary lens and the receptacle has a second index of refraction and forms a secondary lens, the first index of refraction being selected to be greater than the second index of refraction.
15. The method of claim 1 wherein the uncured elastomeric encapsulant is dispensed into the receptacle prior to inserting the LED chip and substrate first portion through the aperture.
16. The method of claim 1 wherein the elastomeric encapsulant comprises at least one of silicone, fluorosilicone, perfluoropolymer, and an amphorous fluoroplastic.
17. The method of claim 1 wherein the LED chip is a flip-chip LED.
18. The method of claim 1 wherein the LED chip emits light having a wavelength between 200 nm and 570 nm.
19. The method of claim 1 further comprising:
forming the first lead for surface mounting.
20. The method of claim 1 further comprising:
forming the first lead for thru-hole mounting.