Polarized and non-polarized photoluminescence of GaInP2 alloy with partial CuPt-type atomic ordering: ordered domains vs. disordered regions

Polarized photoluminescence (PL) spectroscopy was employed to conduct an in-depth investigation into the electronic structures and optical properties of GaInP2 alloy With spontaneous atomic ordering. By examining variable-temperature polarized PL spectra in detail, it was found that the luminescence from GaInP2 is composed of two components: polarized and non-polarized parts. These two components exhibit dissimilar temperature dependence. The former is ascribed to the emission of carriers localized in the ordered domains while the latter to the emission of carriers localized in the disordered regions. Thermal activation and transfer of localized carriers from the ordered domains to the disordered regions was revealed and characterized with a thermal activation energy of 10 meV.