High-speed infrared-to-visible up-conversion by free-to-bound transitions in GaP light emitting diodes

Abstract

In GaP:N (Zn,Te) light emitting diodes electroluminescence and photoluminescence have been excited at 4.2K by a Q-switched CO2 laser and a pulsed N2 laser, respectively. In the luminescence spectral transitions of free holes to bound donor states could be identified, being responsible for the fast radiative decay on a nanosecond timescale.