Journal
APPLIED PHYSICS LETTERS
Volume 82, Issue 2, Pages 167-169Publisher
AMER INST PHYSICS
DOI: 10.1063/1.1536729
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We present a study on the time evolution of the electroluminescence (EL) spectra of AlGaN-based deep ultraviolet light-emitting diodes (LEDs) under pulsed current pumping. The EL spectra peaks at 285 nm and 330 nm are found to result from recombination involving band-to-band and free carriers to deep acceptor level transitions. The 330 nm long-wavelength transitions to deep acceptor levels in the p-AlGaN layer as well as the nonradiative processes significantly influence the LED internal quantum efficiency. (C) 2003 American Institute of Physics.
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