Synthesis and luminescence properties of Er3+ doped La3NbO7 ceramic powder

High Eu3+ concentration quenching in Y3TaO7 solid solution for orange-reddish emission in photonics

“…Emphasis have been given to uorite (CaF 2 )-related crystal structures as RE ion hosts. [4][5][6][7][8][9][10][11][12][13][14][15] The uorite cubic structure has a general composition of MO 2 per unit cell, where M is a tetravalent metal. Compounds derived from the uorite structure have aroused growing interest: several materials can be synthesized by replacing the M 4+ cations with ions of different valences.…”

Optical Temperature Sensor Capabilities of the Green Upconverted Luminescence of Er3+ in La3NbO7 Ceramic Powders

“…Rietveld's analysis was carried out for X-ray diffraction patterns obtained from the samples confirmed by the orthorhombic Cmcm space group where the erbium ions were randomly allocated in the lanthanum sites 4c and 8g, surrounded by 8 and 7 oxygens, respectively. The X-ray diffraction patterns of a series of sintered samples with increasing amounts of Er 2 O 3 powders previously reported in [28] prove the formation of the La 3−x Er x NbO 7 phase (x = 0.01, 0.05, 0.1), with the largest peaks indexed with the type structure weberite based on the Cmcm space group. However, (see Supplementary Materials), some additional peaks appear in the XRD patterns and the foreign reflections correspond to a small amount of LaNbO 4 secondary phase.…”

“…The relative percentage of this secondary phase increases with the amount of erbium in the samples. This fact appears to be inherent to the fabrication route in which the presence of Er 3+ disturbs the necessary secondary La 2 O 3 + LaNbO 4 → La 3 NbO 7 reaction and eventually becomes responsible for the segregated phases [28,29]. Samples of the nominal formula La 3−x Er x NbO 7 (x = 0.1), having 9.6% of LaNbO 4 secondary phase, were used in this work in an effort to maximize the emission intensity.…”

“…Although present in our samples, the mentioned minority phases do not play a relevant role in our study. Additional details of sample preparation and structural analysis were described in Reference [28], together with the room temperature study of the luminescence of the Er 3+ ion in this host matrix.…”

“…In a previous work [28], we report the optical properties of the Er 3+ -doped La 3 NbO 7 ceramic compound, checking the properties of this system from a structural point of view; we consider the viability of incorporating luminescent ions in this matrix and the effect of the impurities on the structure, etc., through the erbium luminescence. In this work, we explore the capabilities of the upconverted green emission of phosphors La 3-NbO 7 :Er 3+ as an optical temperature sensor working in the VIS range, under NIR excitation for two different temperature ranges: those with applications in biological processes (303-318 K) and biomedicine and in other higher temperature ranges (up to 525 K) relevant for industrial applications.…”