title: Pure monoclinic La(1-x)Eu(x)PO₄ micro-/nano-structures: fast synthesis, shape evolution and optical properties.
abstract: Rare-earth-doped LaPO4 crystals have been attracting considerable interest. In this work, we reported the fast syntheses of LaPO4 and Eu-doped LaPO4 crystals via a simple oil-bath route, employing La(NO3)3 and KH2PO4 as the original reactants, Eu2O3 as the dopant. The reaction was carried out in ethylene glycol system at 120°C for 30 min without any assistance of surfactants or templates. X-ray powder diffraction analyses showed that pure monoclinic LaPO4 form was obtained in the system without Eu(3+) ions, and the above phase was not changed after integrating Eu(3+) ions into LaPO4 matrix. However, electron microscopy observations discovered that the integration of Eu(3+) ions into LaPO4 matrix obviously changed the morphology and size of the final La(1-x)Eu(x)PO4 crystals. With the increase in Eu(3+) amount from 0 to 0.35, the shape of the final product varied from homogeneous egg-like nanospheroids, to irregular grains with microscales, and to homogeneous microspheroids. Also, the Eu(3+) ion content in La(1-x)Eu(x)PO4 markedly affected the photoluminescence properties of the final product. When x=0.2, the product exhibited the strongest PL emission.
authors.affiliation: College of Chemistry and Materials Science, Key Laboratory of Functional Molecular Solids of Education Ministry, Anhui Laboratory of Molecule-Based Materials, Anhui Key Laboratory of Functional Molecular Solids, Anhui Normal University, 1 Beijing East Road, Wuhu 241000, PR China.
authors.forename: Huanhuan
authors.initials: H
authors.lastname: Chen
authors.affiliation: College of Chemistry and Materials Science, Key Laboratory of Functional Molecular Solids of Education Ministry, Anhui Laboratory of Molecule-Based Materials, Anhui Key Laboratory of Functional Molecular Solids, Anhui Normal University, 1 Beijing East Road, Wuhu 241000, PR China. Electronic address: niyh@mail.ahnu.edu.cn.
authors.forename: Yonghong
authors.initials: Y
authors.lastname: Ni
authors.affiliation: Centres of Modern Analyses, Nanjing University, Nanjing 210093, PR China.
authors.forename: Xiang
authors.initials: X
authors.lastname: Ma
authors.affiliation: Centres of Modern Analyses, Nanjing University, Nanjing 210093, PR China.
authors.forename: Jianming
authors.initials: J
authors.lastname: Hong
keywords: Eu-doping; Fast synthesis; LaPO(4); Optical property