Comparable Structural and Luminescent Characterization of the La<sub>1-x</sub>Eu<sub>x</sub>VO<sub>4</sub> Solid Solutions Synthesized by Solid State and Co-Precipitation Methods

Abstract

Luminescence properties of the two series of the La 1-x Eu x VO 4 (x ranges from to 0.3) solid solutions synthesized by the solid state and co-precipitation methods were investigated.. Luminescence spectra of the investigated samples consist of narrow spectral lines caused by inner f - f electron transitions in the impurity Eu 3+ ions. Excitation spectra consist of three main bands those correspond to different types of transitions in the investigated matrices. There are O - Eu 3+ charge transfer transitions, band-to-band transitions in the matrix of the vanadate compounds and electron transitions in the VO 4 3- vanadate anion. Dependences of the structure and luminescence properties on rate compositions and method of synthesis were studied. Origins of the observed differences between luminescence characteristics of the samples obtained by two different methods are discussed.