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Images of hydrothermal films heat-treated at 180 °C (a) without UV light excitation, (b) with UV light excitation luminescence. The size of the film is .
Morphologies of hydrothermal films: (a), (b), (c), (d), and (h) were hydrothermal treated at 180 °C; (a) and (b) were high magnification images of (c) and (d); (e) and (f) were treated at 150 °C; (g) was treated at 120 °C. (a), (c), (e), and (g) were top-view of the films; (b), (d), (f), and (h) were side-view of the films.
X-ray diffraction patterns of hydrothermal films treated at 180 °C (a), 150 °C (b), and 120 °C (c) the standard diffraction peaks are shown on the bottom for comparison. The missing peaks of 180 °C hydrothermal film were indexed in 150 °C hydrothermal film.
Photoluminescence (PL) spectra of hydrothermal films. (Excitation wavelength was 298 nm.) Films had redshift by 14 nm.
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