GaN based LED having reduced thickness and method for making the same
View Patent ↗A device having a carrier, a light-emitting structure, and first and second electrodes is disclosed. The light-emitting structure includes an active layer sandwiched between a p-type GaN layer and an n-type GaN layer, the active layer emitting light of a predetermined wavelength in the active layer when electrons and holes from the n-type GaN layer and the p-type GaN layer, respectively, combine therein. The first and second electrodes are bonded to the surfaces of the p-type and n-type GaN layers that are not adjacent to the active layer. The n-type GaN layer has a thickness less than 1.25 μm. The carrier is bonded to the light emitting structure during the thinning of the n-type GaN layer. The thinned light-emitting structure can be transferred to a second carrier to provide a device that is analogous to conventional LEDs having contacts on the top surface of the LED.
1. A device comprising:
a carrier;
a light-emitting structure bonded to said carrier and comprising an active layer sandwiched between a first GaN layer comprising a p-type GaN layer and a second GaN layer comprising an n-type GaN layer, said active layer emitting light of a predetermined wavelength in said active layer when electrons and holes from said n-type GaN layer and said p-type GaN layer, respectively, combine therein; and
a first electrode attached to a surface of said first GaN layer that is not adjacent to said active layer and a second electrode attached to said second GaN layer;
wherein said second GaN layer has an average thickness less than 1.25 μm; and
wherein light generated in said active layer exits said device through said carrier and said carrier comprises a layer of material that is transparent to light of said predetermined wavelength.
2. The device of claim 1 wherein said material comprises silicon or sapphire.