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(Color online) EL (a) and PL (b) spectra from the LED ( area) detected under various excitation conditions. The measurement temperatures and carrier injection parameters are indicated in the figures. The curves are shifted in vertical direction for clarity. Inset in (a) shows decomposition of the DRL spectrum into , , and , peaks for the EL spectra.
The dependence of spectral position of EL peak on the value of forward bias (upper axis) and on the calculated maximal electric field (lower axis) in the LEDs at . Experimental data (open symbols) are fitted with Eq. (1) (solid line).
(Color online) PL spectra from the LED at detected at the same light-excitation level and various circuit conditions. A sketch in the figure shows the scheme of the experiment. The curves are shifted in vertical direction for clarity. The constant current through the diode during PL measurements is indicated in the graph above each curve. For the uppermost curve, the LED contacts were shortened and for the curve beneath the contacts were open. Note a redshift of the BB peak positioned at for the largest diode current, i.e., for .
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