Pure rhombohedral Bi_1‐xEu_xPO₄ nano‐/micro‐structures: fast synthesis, shape evolution and luminescence properties

Abstract

BiPO4 and Eu-doped BiPO4 crystals were synthesized via a simple precipitation route at room temperature, employing Bi(NO3)3 and (NH4)2HPO4 as the reactants, Eu2O3 as the dopant and citric acid as a template. X-ray powder diffraction analyses showed that pure rhombohedral BiPO4 form was obtained, and was the preferential orientation growth of the crystal. Field emission scanning electron microscope observations showed that the concentration of Bi(3+) obviously changed the products' morphologies from nanosphere, hollow sphere to hexagonal prism. The acidity of the solution and the contents of citric acid and Eu(3+) ion tailored the size of the final crystals. Effects of concentration of Eu(3+) ion on the luminescence emission intensity were also investigated.

A novel stibium phosphate, LiBa(SbO)2(PO4)3: synthesis, crystal structure and RE3+-activated (RE = Tb3+ and Eu3+) fluorescence performance

“…Specially, rare-earth-activated phosphates with excellent photoluminescence (PL) properties make them suitable as phosphors in white-light-emitting diodes (w-LED). This impulsive consumption has generated a large number of reports, for example, Bi 1-x Eu x PO 4 (Yu et al, 2016), xSr 2 Ca(PO 4 ) 2-(1-x) Ca 10 Li(PO 4 ) 7 :Eu 2+ (Chen et al, 2017), SrMgP 2 O 7 :Ce 3+ ,Dy 3+ (Cheng et al, 2018), Sr 3 Y(PO 4 ) 3 : Eu 3+ ,Tb 3+ (Wang et al, 2019a), SrZn 2 (PO 4 ) 2 :Mn 2+ (Khidhirbrahmendra et al, 2019) and Sr 3 La(PO 4 ) 3 :Eu 3+ (Yang et al, 2019b). Most of the phosphors based on the phosphate system have the advantages of excellent chemical stability, simple ISSN 2053ISSN -2296 # 2019 International Union of Crystallography preparation process, low synthesis temperature and high quantum efficiency.…”