title: Preparation and fluorescence properties of crystalline gel rare earth phosphates.
abstract: An aqueous solution of sodium dihydrogen phosphate was mixed with a aqueous solution of lanthanum nitrate and stirred for 24 h, and the pH was adjusted to 11 using ammonia. The obtained phosphates were analyzed using X-ray diffraction, Fourier transform infrared spectroscopy, thermogravimetry-differential thermal analysis, and scanning electron microscopy. The lanthanum phosphate gel was obtained with a large amount of water. The fluorescence of the gels was investigated by substituting a part of the lanthanum cations with cerium, terbium, and europium cations. UV-vis reflectance and fluorescence spectra of these substituted materials were obtained and analyzed. Rrare-earth phosphate gels with large amounts of water exhibited bluish purple, green, and red fluorescence when cation ratios of La/Ce = 70/30, La/Ce/Tb = 55/30/15, and La/Eu = 95/5 were used, respectively.
authors: Department of Informatics and Environmental Sciences, Kyoto Prefectural University, 1-5, Shimogamo Nakaragi-cho, Sakyo-ku, Kyoto, 606-8522, Japan, onoda@kpu.ac.jp.
authors: Hiroaki
authors: H
authors: Onoda
authors: Takehiro
authors: T
authors: Funamoto
mesh_terms: D005782:Gels; D008674:Metals, Rare Earth / Q000737:chemistry*; D010710:Phosphates / Q000737:chemistry*; D013050:Spectrometry, Fluorescence; D013056:Spectrophotometry, Ultraviolet
chemical_list: D005782:Gels; D008674:Metals, Rare Earth; D010710:Phosphates
references: Chemistry. 2011 Apr 26;17(18):5180-7
references: 21452178
references: Langmuir. 2008 Aug 5;24(15):8309-13
references: 18570444
references: Nanoscale. 2012 Jun 7;4(11):3450-9
references: 22539001
references: J Am Chem Soc. 2011 May 11;133(18):7121-7
references: 21506566
references: J Phys Chem B. 2005 Jun 16;109(23):11450-5
references: 16852401
references: Inorg Chem. 2010 Jun 7;49(11):4996-5002
references: 20462235