Effect of (Pr-Yb) Co-doping on the Luminescence and Dielectric Behaviour of LaNbO4 Ceramic

• DOI: 10.1007/s11664-020-08339-9
• Publication Date: 2020-07-27T18:03:48Z
• Authors: J. P. C. do Nasci...; R. G. M. Oliveira; F. F. do Carmo; J. E. V. de Morais; J. C. Sales; M. A. S. Silva; D. X. Gouveia; H. D. de Andrade; I. S. Queiroz Júnior; A. S. B. Sombra
• Keywords: 01 natural sciences; 0104 chemical sciences

This paper analysed the effects of doping with Pr and Yb on the dielectric and down-conversion luminescence properties in the ceramic matrix LaNbO4. X-ray diffraction analysis showed that no additional phases were present in the materials. Impedance spectroscopy analysis demonstrated increasing conductivity due to the generation of oxygen vacancy, and other charge carriers caused by the change in the oxidation states of Pr as well as by lattice distortion caused with the insertion of Pr and Yb ions. Down-conversion measurements in 470 nm presented well-defined bands in the red region that decreased in intensity with the enhancement of Yb3+. Results obtained demonstrate that Pr-Yb co-doped LaNbO4 (LNO) could be used both in electrical and optical applications.