EFFECTS OF Eu3+ ION CONTENT ON STRUCTURE AND OPTICAL PROPERTIES OF SrTiO3 MATERIALS

Abstract

In order to improve the light quality of white-emitting LEDs, it is necessary to create a material that emits strongly in the red and far red light regions. SrTiO₃ materials doped with Eu³⁺ ions were synthesized by the solid phase reaction method, with a sintering temperature of 1100 ^oC, with doping concentrations from 1 to 6% atoms. The results of X-ray diffraction pattern analysis show that the material has a perovskite structure with a cubic crystal lattice and high phase purity. When sintering at 1100 ^oC, the material has a sharp grain boundary, uniformly distributed in size in the range from 300 to 500 nm. The Eu-doped SrTiO₃ material with strong absorption in the infrared region gives strong emission in the red light region, with an emissivity range from 525 to 725 nm, corresponding to the transition from ⁵D₀ to ⁷F_j (j = 0), 1, 2, 3, 4) of Eu³⁺ ions in the SrTiO₃ lattice. Fluorescence quenching was observed at the doping concentration of 4% Eu³⁺ ions. The resulting material is well suited for coating applications on white light-emitting and specialized LEDs for plant lighting.