Invention Grant
- Patent Title: III-nitride tunnel junction light emitting diode with wall plug efficiency of over seventy percent
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Application No.: US16320924Application Date: 2017-08-17
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Publication No.: US11164997B2Publication Date: 2021-11-02
- Inventor: Benjamin P. Yonkee , Erin C. Young , James S. Speck , Steven P. DenBaars , Shuji Nakamura
- Applicant: THE REGENTS OF THE UNIVERSITY OF CALIFORNIA
- Applicant Address: US CA Oakland
- Assignee: THE REGENTS OF THE UNIVERSITY OF CALIFORNIA
- Current Assignee: THE REGENTS OF THE UNIVERSITY OF CALIFORNIA
- Current Assignee Address: US CA Oakland
- Agency: Gates & Cooper LLP
- International Application: PCT/US2017/047358 WO 20170817
- International Announcement: WO2018/035331 WO 20180222
- Main IPC: H01L33/32
- IPC: H01L33/32 ; H01L33/14 ; H01L33/00 ; H01L33/04 ; H01L33/42 ; H01L33/20 ; H01L33/38 ; H01S5/343

Abstract:
A III-Nitride LED which utilizes n-type III-Nitride layers for current spreading on both sides of the device. A multilayer dielectric coating is used underneath the wire bond pads, both LED contacts are deposited in one step, and the p-side wire bond pad is moved off of the mesa. The LED has a wall plug efficiency or External Quantum Efficiency (EQE) over 70%, a fractional EQE droop of less than 7% at 20 A/cm2 drive current and less than 15% at 35 A/cm2 drive current. The LEDs can be patterned into an LED array and each LED can have an edge dimension of between 5 and 50 μm. The LED emission wavelength can be below 400 nm and aluminum can be added to the n-type III-Nitride layers such that the bandgap of the n-type III-nitride layers is larger than the LED emission photon energy.
Public/Granted literature
- US20190165213A1 III-NITRIDE TUNNEL JUNCTION LIGHT EMITTING DIODE WITH WALL PLUG EFFICIENCY OF OVER SEVENTY PERCENT Public/Granted day:2019-05-30
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