We report low-temperature polarized-photoluminescence (PL) measurement
s on (110) cleaved edges of ordered GaInP2 alloys. By comparing the in
tensity of the forbidden PL polarized along the ordering axis with tha
t of the allowed PL polarized orthogonal to the ordering axis, we stud
y the effect of coulomb interaction on the excitonic transition rate.
The experimentally obtained polarization ratios of 13-20 are consisten
t with calculations based on an eight-band k . p model. (C) 1998 Ameri
can Institute of Physics. [S0021-8979(98)08903-8].