title: Tripolyphosphate as precursor for REPO(4):Eu (3+) (RE = Y, La, Gd) by a polymeric method.
abstract: A modification of the Pechini method was applied to obtain luminescent rare earth orthophosphates. The developed synthetic route is based on the ability of the tripolyphosphate anion (P(3)O(5-)(10)) to act both as a complexing agent and as an orthophosphate precursor. Heating of aqueous solutions containing RE(3+), Eu(3+), P(3)O(5-)(10), citric acid, and ethylene glycol led to polymeric resins. The ignition of these resins at different temperatures yielded luminescent orthophosphates. The produced nanosized phosphors (YPO(4):Eu(3+), (Y,Gd)PO(4):Eu(3+), and LaPO(4):Eu(3+)) were analyzed by infrared and luminescence spectroscopies, X-ray diffractometry, and scanning electron microscopy.
authors.affiliation: Laboratório de Terras Raras, Departamento de Química, Faculdade de Filosofia, Ciências e Letras de Ribeirão Preto, Universidade de São Paulo, Av. dos Bandeirantes 3900, CEP 14040-901, Ribeirão Preto, SP, Brazil.
authors.forename: Paulo C
authors.initials: PC
authors.lastname: de Sousa Filho
authors.forename: Osvaldo A
authors.initials: OA
authors.lastname: Serra
mesh_terms: D005063:Europium / Q000737:chemistry*; D005682:Gadolinium / Q000737:chemistry*; D007811:Lanthanum / Q000737:chemistry*; D049449:Luminescence; D008855:Microscopy, Electron, Scanning; D009942:Organometallic Compounds / Q000138:chemical synthesis* / Q000737:chemistry*; D010777:Photochemistry; D011108:Polymers / Q000138:chemical synthesis* / Q000737:chemistry*; D011122:Polyphosphates / Q000737:chemistry*; D014961:X-Ray Diffraction; D015019:Yttrium / Q000737:chemistry*
chemical_list: D009942:Organometallic Compounds; D011108:Polymers; D011122:Polyphosphates; D005063:Europium; D015019:Yttrium; D007811:Lanthanum; D005682:Gadolinium; C005692:triphosphoric acid