Recent and forthcoming publications in pss

The authors discuss the challenges of light-emitting diodes (LEDs) in view of their application to solid-state lighting. They show that in view of the cost of ownership and of carbon emission reduction, the relevant metrics is effi ciency (lumens/watts), more than the cost of lumens (lumens/$). Then, progress from present performance requires identifi cation of the loss mechanisms in light emission from LEDs. This requires the analysis of both electronic and photonic processes in LEDs.