We demonstrated high-efficiency 250 -262 nm deep-ultraviolet (DUV) AlGaN multi-quantum well (MQW) light-emitting diodes (LEDs) fabricated on AlN/sapphire templates by introducing multiquantum-barrier (MQB) electron-blocking layers (EBLs). A marked enhancement in efficiency, by as much as 2.7 times, was observed for a 250 nm AlGaN LED by replacing the usual ''single-barrier'' EBL with a MQB-EBL. The maximum external quantum efficiencies and output powers of LEDs with MQB-EBLs measured under room temperature (RT) cw operation were 1.18% and 4.8 mW, and 1.54% and 10.4 mW, for the 250 nm and 262 nm LEDs, respectively, which are the highest values ever reported.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.