1. Efficiency droop in light-emitting diodes: Challenges and countermeasures
2. Efficiency droop in InGaN/GaN blue light-emitting diodes: Physical mechanisms and remedies
3. The DARPA’s Super High Efficiency Diode Sources (SHEDS) program goal to increase the wall plug efficiency of diode lasers to 80 percent was surpassed long time ago.
4. National Renewable Energy Laboratory. High-Performance Photovoltaics, available online at http://www.nrel.gov/pv/high_performance_pv.html.
5. High-temperature Si linear light down converter with 220% efficiency