Luminescent Phases in Willemite Films

Abstract
Red-, yellow-, and green-luminescent films have been formed by evaporation of powdered Zn2SiO4[Mn]. The yellow-emitting form was formed by firing the evaporated film plus additive in air at relatively low temperatures (750°C). The red form was produced on Vycor substrates at higher temperatures (1100°C). Infrared reflection studies and x-ray diffraction analyses of these films indicate that the red-emitting form is SiO2[Mn] and that the yellow form is amorphous Zn2SiO4[Mn]. The luminescence of both of these phosphors is probably due to interstitial manganese ions. The strong chemical reaction between the luminescent film and the glass substrate is brought out.

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