Increasing power and efficiency of 265nm-wavelength LEDs

Researchers based in Japan claim the highest output power and external quantum efficiency (EQE) so far for deep ultraviolet (DUV) sub-270nm-wavelength light-emitting diodes (LEDs) during DC operation [Shin-ichiro Inoue et al, Appl. Phys. Lett., vol106, p131104, 2015]. One 265nm device achieved 90mW output power and 6.3% peak EQE. The team from Japan's National Institute of Information and Communications Technology (NICT) and Tokuyama Corp used photonic crystal and subwavelength structures to enhance light extraction, giving improved EQE performance over previous devices.