Synthesis and Photoluminescence of (Zn_2-yEu_y)(Ti_xSn_1-x)O₄ (0 ≤ x ≤ 1, 0 ≤ y ≤ 0.5) Phosphor

Abstract

We synthesized Eu doped (Zn_2-yEu_y)(Ti_xSn_1-x)O₄ (0 ≤ x ≤ 1, 0 ≤ y ≤ 0.5) phosphors using polymerized-complex and coprecipitation methods. As a result, those synthesized by the polymerized-complex method emitted brighter. Red emission was observed around 600 nm by the 4f-4f transition of Eu³⁺ ion in the range from x = 0 to 0.7. With increasing the Ti content over x = 0.9, the emission color shifted to the green color. The green emission was caused by defects in the crystal of the host materials. The crystal structure and morphologies were characterized using powder X-ray diffraction (XRD) and a scanning electron microscope (SEM), respectively. We assumed that the difference in the emission color was caused by the difference in the occupation-site for Eu³⁺ ion in the crystal structure.