Optical characterisation of low-temperature grown ZnO nanorods

摘要

Photoluminescence studies have been carried out on ZnO nanorods from an aqueous chemical growth. The results reveal well-resolved near-band-edge emission with a broad linewidth of about 10 meV. Nanorods of different lengths and diameters on Si and even on plastic substrates showed similar optical properties indicating a good control of the growth process without much influence on the optical properties. Time-resolved photoluminescence measurements show a very fast decay time of about 70 ps for the as-grown samples but longer decay time of about 175 ps for the annealed samples.