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Title: Crystal growth and spectral properties of Pr{sup 3+}:La{sub 2}(WO{sub 4}){sub 3}

Abstract

Pr{sup 3+}-doped La{sub 2}(WO{sub 4}){sub 3} single crystal with dimensions up to O 20 mm x 35 mm has been grown by the Czochralski method. The structure of the Pr{sup 3+}:La{sub 2}(WO{sub 4}){sub 3} crystal was determined by the X-ray powder diffraction and the Pr{sup 3+} concentration in this crystal was determined. The absorption and fluorescence spectra of Pr{sup 3+}:La{sub 2}(WO{sub 4}){sub 3} crystal were measured at room temperature, and the fluorescence lifetime of main emission multiplets were estimated from the recorded decay curves. The spectral properties related to laser performance of the crystal were evaluated.

Authors:
 [1];  [1];  [1];  [1];  [1];  [2]
  1. National Engineering Research Center for Optoelectronic Crystalline Materials, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian 350002 (China)
  2. National Engineering Research Center for Optoelectronic Crystalline Materials, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian 350002 (China). E-mail: huyd@fjirsm.ac.cn
Publication Date:
OSTI Identifier:
21000600
Resource Type:
Journal Article
Resource Relation:
Journal Name: Materials Research Bulletin; Journal Volume: 42; Journal Issue: 3; Other Information: DOI: 10.1016/j.materresbull.2006.07.013; PII: S0025-5408(06)00292-3; Copyright (c) 2006 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ABSORPTION; CRYSTAL GROWTH; CZOCHRALSKI METHOD; DECAY; DOPED MATERIALS; FLUORESCENCE; FLUORESCENCE SPECTROSCOPY; LASERS; MONOCRYSTALS; MULTIPLETS; OPTICAL PROPERTIES; PRASEODYMIUM IONS; TUNGSTATES; X-RAY DIFFRACTION

Citation Formats

Gong Xinghong, Xiong Feibing, LinYanfu, Tan Qiguang, Luo Zundu, and Huang Yidong. Crystal growth and spectral properties of Pr{sup 3+}:La{sub 2}(WO{sub 4}){sub 3}. United States: N. p., 2007. Web. doi:10.1016/j.materresbull.2006.07.013.
Gong Xinghong, Xiong Feibing, LinYanfu, Tan Qiguang, Luo Zundu, & Huang Yidong. Crystal growth and spectral properties of Pr{sup 3+}:La{sub 2}(WO{sub 4}){sub 3}. United States. doi:10.1016/j.materresbull.2006.07.013.
Gong Xinghong, Xiong Feibing, LinYanfu, Tan Qiguang, Luo Zundu, and Huang Yidong. Thu . "Crystal growth and spectral properties of Pr{sup 3+}:La{sub 2}(WO{sub 4}){sub 3}". United States. doi:10.1016/j.materresbull.2006.07.013.
@article{osti_21000600,
title = {Crystal growth and spectral properties of Pr{sup 3+}:La{sub 2}(WO{sub 4}){sub 3}},
author = {Gong Xinghong and Xiong Feibing and LinYanfu and Tan Qiguang and Luo Zundu and Huang Yidong},
abstractNote = {Pr{sup 3+}-doped La{sub 2}(WO{sub 4}){sub 3} single crystal with dimensions up to O 20 mm x 35 mm has been grown by the Czochralski method. The structure of the Pr{sup 3+}:La{sub 2}(WO{sub 4}){sub 3} crystal was determined by the X-ray powder diffraction and the Pr{sup 3+} concentration in this crystal was determined. The absorption and fluorescence spectra of Pr{sup 3+}:La{sub 2}(WO{sub 4}){sub 3} crystal were measured at room temperature, and the fluorescence lifetime of main emission multiplets were estimated from the recorded decay curves. The spectral properties related to laser performance of the crystal were evaluated.},
doi = {10.1016/j.materresbull.2006.07.013},
journal = {Materials Research Bulletin},
number = 3,
volume = 42,
place = {United States},
year = {Thu Mar 22 00:00:00 EDT 2007},
month = {Thu Mar 22 00:00:00 EDT 2007}
}
  • The luminescent nanocrystalline KEu(WO{sub 4}){sub 2} and KGd{sub 0.98}Eu{sub 0.02}(WO{sub 4}){sub 2} have been prepared by the Pechini method. X-ray diffraction, infrared and Raman spectroscopy as well as optical spectroscopy were used to characterise the obtained materials. The crystal structure of KEu(WO{sub 4}){sub 2} was refined in I2/c space group indicating the isostructurality to KGd(WO{sub 4}){sub 2}. The size of the crystalline grains depended on the annealing temperature, increasing with the increase of the temperature. The average size of crystallites of both crystals formed at 540 deg. C was about 50 nm. Vibrational spectra showed noticeable changes as a functionmore » of size due to, among others, phonon confinement effect. Luminescence studies did not reveal significant changes for the nanocrystallites with the lowest grain size in comparison with the bulk material. The differences observed in luminescence spectra in form of slight inhomogeneous broadening of the spectral lines and increase of the hypersensitive I{sub 0-2}/I{sub 0-1} ratio point to very low symmetry of Eu{sup 3+} ions and change of the polarisation of the local vicinities of Eu{sup 3+}. X-ray diffraction, vibrational and optical studies showed that the structure of the synthesised nanocrystalline KEu(WO{sub 4}){sub 2} and KGd(WO{sub 4}){sub 2}:Eu is nearly the same as that found for the bulk material. The size-driven phase transitions were established for both compounds. - Graphical abstract: The luminescent nanocrystalline KEu(WO{sub 4}){sub 2} and KGd{sub 0.98}Eu{sub 0.02}(WO{sub 4}){sub 2} have been prepared by the Pechini method and characterise by using X-ray diffraction, infrared and Raman spectroscopy as well as optical spectroscopy. The crystal structure of KEu(WO{sub 4}){sub 2} was refined in I2/c space group indicating the isostructurality to KGd(WO{sub 4}){sub 2}. The size of the crystalline grains increases with the increase of the annealed temperature. The average size of crystallites of both crystals formed at 540 deg. C was about 50 nm. X-ray diffraction, vibrational and optical studies showed that the structure of the synthesised nanocrystalline KEu(WO{sub 4}){sub 2} and KGd(WO{sub 4}){sub 2}:Eu is nearly the same as that found for the bulk material. The size-driven phase transitions were established for both compounds.« less
  • Reaction of LaCl{sub 3} with 3 equiv of sodium metal in liquid ammonia at -78 {degrees}C, followed by addition of 3 equiv of HOAr (Ar = 2,6-i-Pr{sub 2}C{sub 6}H{sub 3}) in toluene produces La(OAr){sub 3}(NH{sub 3}){sub x} (1) after warming to room temperature. Dissolution of 1 in toluene followed by 6 h reflux provides La{sub 2}(OAr){sub 6} (2) in good yield. An X-ray crystallographic study revealed that 2 contains a dimeric unit held together with two {eta}{sup 6}-arene bridges formed from aryloxide ligands with La-C(av) = 3.062(10) {Angstrom}. The La-O distances average 2.193(5) and 2.273(5) {Angstrom} for terminal and bridgingmore » aryloxide ligands, respectively. Dissolution of 1 in toluene followed by vacuum filtration and crystallization from toluene without reflux yields La{sub 2}(OAr){sub 6}(NH{sub 3}){sub 2}(3) in high yield. The X-ray crystal structure of 3 reveals an alternate dimeric structure bridged by oxygen atoms of the aryloxide ligands. X-ray crystallography has shown that a third compound may be isolated by gravity filtration and crystallization of 1 to produce La(OAr){sub 3}(NH{sub 3}){sub 4} (4). 4 displays a capped pseudo-octahedral geometry around the metal center with facial aryloxide ligands average 2.252(6) {Angstrom}. The La-N distances for the NH{sub 3} ligands average 2.750(9) {Angstrom} with no significant lengthening of the capped La-N bond.« less
  • The syntheses of polynuclear copper(II)-lanthanide(III) complexes using the 2,6-bis[(dimethylamino)methyl]-4-methylphenolato ligand (bdmmp) have been investigated. The reaction of Cu(OCH{sub 3}){sub 2} with 2 equiv of bdmmpH in THF yields a mononuclear copper complex Cu(bdmmp){sub 2}(H{sub 2}O) (1), which subsequently reacts with 1 equiv of Pr(hfacac){sub 3} or La(O{sub 2}CCF{sub 3}){sub 3} (hfacac = hexafluoroacetylacetonato) to produce two heteronuclear complexes Pr{sup III}-Cu{sup II}(bdmmp)(bdmmpH)(OH)(hfacac){sub 3} (2) and [La{sup III}Cu{sup II}(bdmmp)(bdmmpH)(OH)(O{sub 2}CCF{sub 3}){sub 3}]{sub 2} (3). The reaction of Cu{sub 4}(bdmmp){sub 2}({mu}{sub 4}-O)(O{sub 2}CCF{sub 3}){sub 4} (4). The structures of compounds 1-4 have been determined by single-crystal X-ray diffraction analysis. The magnetic properties ofmore » these compounds have been examined by variable-temperature magnetic susceptibility measurements. The magnetism of compound 2 is dominated by the paramagnetism of the Pr(III) ion, while the magnetism of 4 is dominated by antiferromagnetic exchanges of the Cu(II) ions with J{sub 1} = -101 cm{sup {minus}1}, J{sub 2} = -101 cm{sup {minus}1}, J{sub 3} = -45 cm{sup {minus}1}, J{sub 4} = 3 cm{sup {minus}1}, and g = 2.02. UV-vis spectroscopic studies revealed that compound 1 has an intense ligand {yields} metal charge transfer band at {lambda} = 427 nm. Molecular orbital analysis on the electronic structure of 1 by extended Hueckel MO methods indicates that this absorption band is mainly due to the transitions of the {pi} orbitals of the phenoxy ligand to the singly occupied d{sub x{sup 2}-y{sup 2}} orbital of the copper ion.« less
  • The orthorhombic crystal structures of the series of Ln{sub 4-x}In{sub 5-y}S{sub 13} (Ln=La, Ce, Pr and Nd; x=0.08-0.12, y=0.21-0.24) compounds were investigated by means of X-ray crystal diffraction. The crystals of La{sub 3}In{sub 1.67}S{sub 7} and Gd{sub 3}InS{sub 6} were also obtained unexpectedly from the La-In-S and Gd-In-S systems and no respective Gd{sub 4-x}In{sub 5-y}S{sub 13} was obtained. In the structures of the orthorhombic Ln{sub 4-x}In{sub 5-y}S{sub 13} series and hexagonal La{sub 3}In{sub 1.67}S{sub 7} indium atoms occupy disordered positions in the octahedral and trigonal antiprismatic arrangement of the sulphur atoms. The crystal structure of the La{sub 4}Ag{sub 2}In{sub 4}S{submore » 13} is also given and discussed as an example of quaternary sulphide related to a ternary La-In sulphide. - Graphical abstract: In the series of the Ln{sub 4-x}In{sub 5-y}S{sub 13} (Ln=La, Ce, Pr and Nd; x=0.08-0.12, y=0.21-0.24) compounds the indium atoms occupy disordered position in the octahedral arrangement of the sulphur atoms. The tetrahedral position is ordered.« less
  • Reaction of lanthanum, cerium, or neodymium metals with 3/2 equiv of iodine in 2-propanol leads to formation of the alcohol adducts LnI{sub 3}(HO-i-Pr){sub 4} (Ln = La (1), Ce (2), Nd (3)) in good yield. Reaction of thorium metal turnings with 2 equiv of iodine in 2-propanol produces the dimeric halide-alkoxide complex Th{sub 2}I{sub 4} (O-i-Pr){sub 4}(HO-i-Pr){sub 2}(4). The molecular structures of 1,2 and 4 have been determined by means of single-crystal X-ray diffraction studies.