Synthesis of Tungstate Thin Films and Their Optical Properties

Article abstract of DOI:10.1246/bcsj.69.1241

A simple and new synthetic method of tungstate thin films (CaWO₄, MgWO₄, PbWO₄, ZnWO₄) was developed. The absorption and luminescence spectra of tungstate thin films synthesized on quartz substrates were measured; the optical properties were also studied. It was found that CaWO₄ has E_g = 5.4 eV of a direct transition nature. Tungstate thin films were strongly luminescent when irradiated with UV-light. Excitation at around 290 nm was interpreted as a singlet-triplet transition.