Synthesis, structure, and luminescence of Eu3+‐activated La4Ti3O12nanoparticles with layered perovskite structure

Abstract

AbstractLa4‐4xEu4xTi3O12(x= 0.01‐0.15) nanoparticles were synthesized via the polymerizable complex method. The X‐ray powder diffraction (XRD) measurements and Rietveld refinements verified that all the samples crystallized in a pure trigonal perovskite structure. La4Ti3O12has band energy of 3.88eV, which can be greatly narrowed by Eu3+‐doping. This benefits the red‐shift of the optical absorption fromUV‐ to near‐UVwavelength region. La4Ti3O12has the self‐activated luminescence at room temperature with a broadband centered at 520 nm. La4‐4xEu4xTi3O12(x= 0.01‐0.15) phosphors present red‐emitting luminescence with the strongest5D0→7F2transition at 613 nm. The energy transfer was discussed on the doping concentration. Importantly, the phosphors present dominant absorption in near‐UVregion (395 nm). An experimental red‐emitting lamp was fabricated using a 395 nmLED‐chip in combination with the single phosphor of La4‐4xEu4xTi3O12(x= 0.1). The results indicate that La4‐4xEu4xTi3O12could be a promising candidate used in solid‐state lighting and display under nearUV‐light.