Synthesis and Characteristics of the Zinc Effects on Eu³⁺ Doped (Zn,Ca)TiO₃ Phosphors

Abstract

For the purpose of development of highly energy-efficient light sources, one needs to design highly efficient green, red and yellow phosphors, which are able to absorb excitation energy and generate emissions. In this contribution, we present our results on producing some efficient phosphors with improved luminescence properties. The effects of zinc on the zinc-doped CaTiO 3 :Eu 3+ phosphors have been investigated by varying the zinc concentrations. X-ray powder diffraction (XRD) and Scanning electron microscopy (SEM) characterizations were studies for their structural and morphological analysis. The variation of zinc concentration influences the crystallinity and morphology of the phosphors. The luminescence spectra of (Zn,Ca)TiO 3 : Eu 3+ have been measured. Eu 3+ : (Zn,Ca)TiO 3 have shown five emission transitions of 5 D 0 → 7 F 0,1,2,3 & 4 located at 580 nm,593nm 615 nm,655 and 704 respectively with excitation at λ exci =398nm ( 7 F 0 → 5 L 6 ). Moreover, the emitting phosphor developed in this study can be very effectively excited at the wavelengths of 398 nm. The (Zn, Ca)TiO 3 :Eu 3+ can be used as a complementary phosphor in there red region for the white LEDs.