Lead Performer: Lumileds, LLC – San Jose, CA
Partners: University of Michigan, University of New Mexico, Sandia National Laboratories, Ohio State University
DOE Total Funding: $4,755,095
Project Term: April 1, 2020 – March 31, 2024
Funding Type: SSL R&D Funding Opportunity Announcement (FOA) (DE-FOA-0002090)

Project Objective

Mixing of discrete-color LEDs to achieve white light offers the highest theoretical maximum efficacy but presently lags far behind the phosphor-conversion approach in efficacy. Large improvements in the efficiency of green LEDs in particular are needed to make the color-mixing approach competitive in efficacy. In the longer term, realizing color-mixing systems with color-tuning capabilities and high color quality will also require efficient yellow LEDs. In this project, Lumileds, the University of Michigan, the University of New Mexico, Sandia National Laboratories, and Ohio State University will conduct a collaborative and comprehensive research effort to investigate the most-promising approaches to improve long-wavelength InGaN LEDs using state-of-the-art industry epitaxy. The project goals will be achieved by applying a multipronged development strategy that leverages the cross-functional capabilities of the different project team members. Advanced LED characterization methods and predictive modeling calculations will be applied to design epitaxy optimization experiments more effectively and accelerate the pace of internal quantum efficiency improvements. Work will also be done to implement novel device concepts capable of delivering efficiency breakthroughs.

Project Impact

Achieving the green performance target will make possible color-mixing system efficacy that compares favorably to today’s phosphor-converted LEDs. Work toward the yellow goal will ascertain the feasibility of long-wavelength InGaN LEDs and inform decisions on which materials system is the best candidate to bridge the green-red gap.


DOE Technology Manager: Wyatt Merrill
Lead Performer: Rob Armitage, Lumileds LLC