Abstract
Ultraviolet light-emitting diodes (LEDs) with emission wavelength as short as 280 nm, grown by gas source molecular beam epitaxy with ammonia, are described. The typical multi-quantum well (MQW) structure LED consists of an AlN buffer layer deposited on Si(111) or sapphire, followed by a (Al)GaN buffer layer and two superlattice structures, n- and p-type, with the MQW active region placed between them. Room temperature Hall measurements of n- and p-type AlN/AlGaInN superlattice structures show average hole concentrations of 1 x 10 18 cm -3 , with mobility of 3-4 cm 2 /Vs, and electron concentrations of 3 × 10 19 cm -3 , with mobility of 10-20 cm 2 /Vs. Room temperature electroluminescence spectra of mesa-etched devices show predominant emission at 280 nm.
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