Abstract
This paper reports the enhanced photoluminescence from Eu3+, A(+) (Li+, Na+, K+) co-doped CaZrO3 phosphors synthesized through solid state reaction method. The X-ray diffraction (XRD) measurement reveals the orthorhombic phase of CaZrO3 crystal. The scanning electron micrographs (SEM) show that the shape of the particle is converted from polyhedron to cubic on co-doping of alkali ions. All the phosphors emit intense red emission at 613 nm corresponding to D-5(0)-> F-7(2) transition of Eu3+ ion under the excitation with 266, 280, 355 and 395 nm wavelengths. The alkali ions enhance the emission intensity of Eu3+: CaZrO3 phosphor due to increase in the asymmetry in the crystal field and charge compensation. The optical band gap of Eu3+: CaZrO3 phosphor decreases and the lifetime of D-5(0) level of Eu3+ ion increases in the presence of alkali ions. This material can be a potential red emitting phosphor for UV-based white LED and other display devices.