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A Novel Method for the Preparation of Green Photoluminescent Undoped Zinc Oxide Film Involving Excimer Laser Irradiation of a Sol-Gel-Derived Precursor

A green photoluminescent (PL) undoped zinc oxide film was successfully prepared by a novel method involving KrF excimer laser irradiation of a sol-gel-derived precursor. This method requires the appropriate energy fluence (Ef) of 100 mJ/cm2 of the laser, and has the advantage of practical production at a low substrate temperature of 473 K in air. Transmission electron microscopy (TEM) and X-ray diffraction (XRD) observations showed that the green PL film has close-packed columnar crystals in an upper layer, where the green PL centers involving oxygen vacancies are presumed to be present.