Visible and near-infrared luminescent properties of Pr3+/Yb3+ co-doped lanthanum ortho-niobate phosphors

Photoluminescence properties of europium-activated double layered perovskite Sr3Ti2O7 for high-quality lighting applications

“…The CIE color co-ordinate can be calculated by using the tristimulus values through the following relationships 53 …”

Red and near-infrared emitting phosphors based on Eu3+- or Nd3+-doped lanthanum niobates prepared by the sol–gel route

“…This should allow the host to be doped with large amounts of dopant without the niobate structure changing significantly. 55 According to the La 2 O 3 -Nb 2 O 5 phase diagram, lanthanum niobate consists of four defined compounds: La 3 NbO 7 , LaNbO 4 , LaNb 3 O 9 , and La 2 Nb 12 O 33 . 56 La 3 NbO 7 , an orthorhombic perovskite, is employed as the electrolyte, 57 and so is LaNbO 4 , an orthoniobate with a monoclinic structure that adopts the tetragonal structure at higher temperatures.…”

“…56 La 3 NbO 7 , an orthorhombic perovskite, is employed as the electrolyte, 57 and so is LaNbO 4 , an orthoniobate with a monoclinic structure that adopts the tetragonal structure at higher temperatures. 58 Most of the literature reports concerning lanthanum niobate use the solid-state method as the synthetic route 55,[57][58][59][60][61]69 and only a few works are focused on sol-gel synthesized lanthanum niobate, 56,62 which provides as advantages the obtainment of crystalline phases at lower annealing temperatures, homogeneous rare earth doping and morphological control at nano and microscales.…”