Photoluminescence tuning of Na1−xKxNdW2O8 (0.0 ≤ x ≤ 0.7) nanoparticles: synthesis, crystal structure and Raman study

2014 ◽  
Vol 16 (35) ◽  
pp. 18772-18780 ◽  
Author(s):  
Swetha S. M. Bhat ◽  
Ashfia Huq ◽  
Diptikanta Swain ◽  
Chandrabhas Narayana ◽  
Nalini G. Sundaram
Keyword(s):  
Crystal Structure ◽  
Ionic Radius ◽  
Bond Angle ◽  
Blue Shift ◽  
Inhomogeneous Broadening ◽  
Photoluminescence Properties ◽  
Nanoparticles Synthesis ◽  
Ion Substitution ◽  
Raman Study ◽  
Local Disorder

K+ ion substitution in Na site of NaNdW2O8 results in blue shift, inhomogeneous broadening and enhanced photoluminescent intensity. Nd–O–W bond angle, local disorder and difference in ionic radius are responsible for the observed difference in photoluminescence properties.

Synthesis, crystal structure and photoluminescence properties of Eu2+-activated RbCaGd(PO4)2 phosphors

RSC Advances ◽  
2016 ◽  
Vol 6 (14) ◽  
pp. 11211-11217 ◽  
Author(s):  
Xue Chen ◽  
Qidi Wang ◽  
Fengzhu Lv ◽  
Paul K. Chu ◽  
Yihe Zhang
Keyword(s):  
Crystal Structure ◽  
Sol Gel ◽  
Dipole Interaction ◽  
Concentration Quenching ◽  
Photoluminescence Properties ◽  
Gel Method ◽  
Sol Gel Method ◽  
First Time

RbCaGd(PO4)2:Eu2+ was prepared by the Pechini-type sol–gel method. The crystal structure was determined in the first time. The dipole–dipole interaction plays a major role in the mechanism of concentration quenching of Eu2+ in this phosphor.

scholarly journals Crystal structure ofN1-phenyl-N4-[(quinolin-2-yl)methylidene]benzene-1,4-diamine

2014 ◽  
Vol 70 (9) ◽  
pp. o905-o906 ◽  
Author(s):  
Md. Serajul Haque Faizi ◽  
Ashraf Mashrai ◽  
Saleem Garandal ◽  
M. Shahid
Keyword(s):  
Crystal Structure ◽  
Hydrogen Bonding ◽  
Benzene Ring ◽  
Title Compound ◽  
Phenyl Ring ◽  
Bond Angle ◽  
Ring System ◽  
Dihedral Angles ◽  
Quinoline Ring ◽  
Compound C

In the title compound, C22H17N3, the dihedral angles between the central benzene ring and the terminal phenyl ring and quinoline ring system (r.m.s. deviation = 0.027 Å) are 44.72 (7) and 9.02 (4)°, respectively, and the bond-angle sum at the amine N atom is 359.9°. In the crystal, the N—H group is not involved in hydrogen bonding and the molecules are linked by weak C—H...π interactions, generating [010] chains.

Effect of Thermal Annealing on the Photoluminescence Properties of a GaInNAs/GaAs Single Quantum Well

2000 ◽  
Vol 639 ◽  
Author(s):  
Laurent Grenouillet ◽  
Catherine Bru-Chevallier ◽  
Gérard Guillot ◽  
Philippe Gilet ◽  
Philippe Ballet ◽  
...  
Keyword(s):  
Quantum Well ◽  
Thermal Annealing ◽  
Low Temperatures ◽  
Blue Shift ◽  
Emission Peak ◽  
Single Quantum ◽  
Photoluminescence Properties ◽  
Single Quantum Well ◽  
Peak Energy ◽  
Strong Blue Shift

ABSTRACTWe report on the effect of thermal annealing on the photoluminescence properties of a Ga0.65In0.35N0.02As0.98/GaAs single quantum well. Thermal annealing is shown to decrease the strong nitrogen-induced localization effects observed at low temperatures and to reduce the full width at half maximum of the emission peak. It also induces a strong blue shift of the emission peak energy, which is thought not to arise from an In-Ga interdiffusion alone, as it is much larger than in a nitrogen-free reference single quantum well.

The crystal structure of kalsilite, KAlSiO4

1965 ◽  
Vol 35 (272) ◽  
pp. 588-595 ◽  
Author(s):  
A. J. Perrotta ◽  
J. V. Smith
Keyword(s):  
Crystal Structure ◽  
Oxygen Atom ◽  
Crystal Structures ◽  
Bond Angle ◽  
Three Dimensional ◽  
Full Matrix ◽  
Ideal Position ◽  
Wide Range ◽  
The Ideal

SummaryA full-matrix, three-dimensional refinement of kalsilite, KAlSi04 (hexagonal, a 5·16, c 8.69 Å, P6a), shows that the silicon and aluminium atoms are ordered. The respective tetrahedral distances of 1·61 and 1·74 Å agree with values of 1·61 and 1·75 Å taken to be typical of framework structures. As in nepheline, an oxygen atom is statistically distributed over three sites displaced 0·25 Å from the ideal position on a triad axis. This decreases the bond angle from 180° to 163° in conformity with observations on some other crystal structures. The potassiumoxygen distances of 2·77, 2·93, and 2·99 Å are consistent with the wide range normally found for this weakly bonded atom.

A first Mn member in the struvite morphotropic series, CsMn(H2O)6(PO4): hydrothermal synthesis, crystal structure and interconnections within the family of related phosphates

2018 ◽  
Vol 74 (8) ◽  
pp. 936-943
Author(s):  
Galina V. Kiriukhina ◽  
Olga V. Yakubovich ◽  
Ekaterina M. Kochetkova ◽  
Olga V. Dimitrova ◽  
Anatoliy S. Volkov
Keyword(s):  
Crystal Structure ◽  
Ionic Radius ◽  
The Novel ◽  
X Ray Diffraction ◽  
Unit Cell Parameters ◽  
Hydrothermal Conditions ◽  
X Ray ◽  
Cell Parameters ◽  
Structural Relationships ◽  
The Family

Caesium manganese hexahydrate phosphate, CsMn(H2O)6(PO4), was synthesized under hydrothermal conditions. Its crystal structure was determined from single-crystal X-ray diffraction data. The novel phase crystallizes in the hexagonal space group P63 mc and represents the first manganese member in the struvite morphotropic series, AM(H2O)6(TO4). Its crystal structure is built from Mn(H2O)6 octahedra and PO4 tetrahedra linked into a framework via hydrogen bonding. The large Cs atoms are encapsulated in the framework cuboctahedral cavities. It is shown that the size of the A + ionic radius within the morphotropic series AM(H2O)6(XO4) results is certain types of crystal structures and affects the values of the unit-cell parameters. Structural relationships with Na(H2O)Mg(H2O)6(PO4) and the mineral hazenite, KNa(H2O)2Mg2(H2O)12(PO4)2, are discussed.

Crystal Structure and Photoluminescence Properties of an Incommensurate Phase in EuO- and P2O5-Doped Ca2SiO4

2019 ◽  
Vol 58 (9) ◽  
pp. 6155-6160 ◽  
Author(s):  
Yuya Hiramatsu ◽  
Yuichi Michiue ◽  
Shiro Funahashi ◽  
Naoto Hirosaki ◽  
Hiroki Banno ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Incommensurate Phase ◽  
Photoluminescence Properties

S5N5[SnCl5(CH3CN)]; Synthese, IR-Spektrum, 119Sn-Mößbauer-Spektrum und Kristallstruktur / S5N5[SnCl5(CH3CN)]; Synthesis, IR Spectrum , Mössbauer Spectrum and Crystal Structure

1986 ◽  
Vol 41 (10) ◽  
pp. 1191-1195 ◽  
Author(s):  
Ute Patt-Siebel ◽  
Somluck Ruangsuttinarupap ◽  
Ulrich Müller ◽  
Jürgen Pebler ◽  
Kurt Dehnicke
Keyword(s):  
Crystal Structure ◽  
Structure Determination ◽  
Ir Spectrum ◽  
Bond Angle ◽  
Mossbauer Spectrum ◽  
Monoclinic Space Group ◽  
Mössbauer Spectrum ◽  
X Ray ◽  
Distorted Octahedral Coordination ◽  
Distorted Octahedral

S5N5[SnCl5(CH3CN)] is prepared by the reaction of SnCl2 with trithiazyl chloride in acetonitrile suspension. The compound is characterized by its IR spectrum, the 119Sn Mössbauer spectrum and by an X-ray crystal structure determination (1851 observed, independent reflexions, R = 0.024). S5N5[SnCl5(CH3CN)] crystallizes in the monoclinic space group P21/n with Z = 4 and the lattice dimensions a = 758.8; b = 1574.6; c = 1429.1 pm; β = 97.65°. The compound consists of planar S5N5® cations with the azulene-like structure, and anions [SnCl5(CH3CN)]e in which the tin atom has a distorted octahedral coordination. The bond angle Sn-N ≡ C (168°) is surprisingly small.

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