Publikationsdatum:
2019
Beschreibung:
Abstract
La4‐4xEu4xTi3O12 (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. La4Ti3O12 has band energy of 3.88 eV, which can be greatly narrowed by Eu3+‐doping. This benefits the red‐shift of the optical absorption from UV‐ to near‐UV wavelength region. La4Ti3O12 has 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 strongest 5D0→7F2 transition at 613 nm. The energy transfer was discussed on the doping concentration. Importantly, the phosphors present dominant absorption in near‐UV region (395 nm). An experimental red‐emitting lamp was fabricated using a 395 nm LED‐chip in combination with the single phosphor of La4‐4xEu4xTi3O12 (x = 0.1). The results indicate that La4‐4xEu4xTi3O12 could be a promising candidate used in solid‐state lighting and display under near UV‐light.
Print ISSN:
0002-7820
Digitale ISSN:
1551-2916
Thema:
Maschinenbau
,
Physik
