ABSTRACT
The CaZrO3:Gd3+ phosphors with cubic crystallographic structure were prepared via high temperature modified solid state diffusion method. The morphology of CaZrO3:Gd3+ phosphor consists of granular agglomerates with dimensions in the range of 0.1-50 μm. It was found that the photoluminescence emission spectrum of CaZrO3:Gd3+ micro-crystals exhibited the prominent spectral line at around 312 nm, which is attributed to the UVB emission of Gd3+ ions. The maximum luminescence intensity was obtained for the CaZrO3 samples with 2 mol% of Gd3+ contents. With higher concentration of Gd3+ ions (>2 mol%) the concentration quenching phenomenon in tested phosphor takes place. It was demonstrated that the multipole-multipole interaction was the main mechanism responsible for luminescence quenching. The narrow-band UVB emission of CaZrO3:Gd3+ samples validate its practical applicability as a promising candidate for phototherapy lamps.
