PHOTOLUMINESCENCE AND EXCITATION-PHOTOLUMINESCENCE STUDY OF SPONTANEOUS ORDERING IN GAINP2

Low-temperature polarized photoluminescence and polarized photolumines cence-excitation spectroscopies are used to probe the electronic struc ture of GaInP2 epilayers grown by organometallic vapor-phase epitaxy. The epilayers were grown at various sample temperatures and exhibit di fferent degrees of ordering. A systematic study of the absorption edge and luminescence line shapes provides evidence for a distribution of order parameters, eta, within the more ordered samples of this study.