Photoluminescence and Cathodoluminescence Characterization of Ge/GeO2 Nanostructure Synthesized by Thermal Evaporation of Ge Powder

This paper reports the first attempt to characterize the light-emission from Ge/GeO 2 nanostructure synthesized by thermal evaporation. The synthesized Ge/GeO 2 was observed to have a nanowire structure. Photoluminescence (PL) results show that the emission center of the PL peak at about 410 and 485 nm depends on the excitation wavelength. Experimental XRD, EDS and spectral analyses suggest that the 410 nm emission can be attributed to the Ge core; however, 485 nm is attributed to the GeO 2 sheath.