TIME-RESOLVED BLUE AND ULTRAVIOLET PHOTOLUMINESCENCE IN POROUS GAP

Porous GaP layers prepared by electrochemical anodization of (100)-ori ented bulk material was found to exhibit blue and ultraviolet photolum inescence when excited by a KrF excimer laser. The energy position of the UV luminescence band (3.3 eV at 300 K) is explained on the basis o f charge carrier confinement in crystalline quantum wires of about 25 Angstrom in diameter. Additional evidence for quantum size effect in p orous GaP was obtained by Raman scattering measurements. (C) 1995 Amer ican Institute of Physics.