Aa. Grinberg et Sk. Sputz, THRESHOLD-LIKE BEHAVIOR OF PHOTOLUMINESCENCE IN LASER HETEROSTRUCTUREWAFERS, Journal of applied physics, 82(8), 1997, pp. 4006-4012
Thresholdlike behavior of photoluminescence (PL) in heterostructure wa
fers is studied. It is shown that strictly speaking there is no pi, th
reshold, and the thresholdlike dependence of PL on the pump power resu
lts from the combination of three factors: the PL spreading along the
wafer surface, the change in the radiative fraction of electron-hole r
ecombination, and the restricted aperture of the PL detector. The firs
t two factors were found to be dominating in the wafers studied. (C) 1
997 American Institute of Physics.