Crystal structure and luminescence properties of a novel promising phosphor Ba3ScB9O18

2007 ◽  
Vol 22 (4) ◽  
pp. 328-333 ◽  
Author(s):  
Gemei Cai ◽  
Ming He ◽  
X. L. Chen ◽  
W. Y. Wang ◽  
Y. F. Lou ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Emission Band ◽  
Light Yield ◽  
Green Emission ◽  
Structural Features ◽  
Luminescence Properties ◽  
X Ray Diffraction ◽  
X Ray ◽  
Green Emission Band ◽  
Excited Luminescence

A novel borate compound Ba3ScB9O18 has been synthesized by solid-state reaction and its structure has been determined and refined from powder X-ray diffraction data. This compound crystallizes in a hexagonal cell (space group P63/m) with lattice parameters a=7.1360(4) Å and c=16.5420(9) Å, and each unit cell contains two formulas. Its crystal structure is made up of planar B3O6 groups parallel to each other along the [001] direction, regular ScO6 octahedra, irregular BaO6 hexagons, and BaO9 polyhedra to form an analogue structure of Ba3YB9O18. DTA and TGA curves for Ba3ScB9O18 show that it is a chemically stable and congruent melting compound. Luminescence properties for Ba3ScB9O18 were investigated using fluorescence spectroscopy and X-ray excited luminescence measurements. Its emission spectrum upon UV excitation (330 nm) has exhibited a prominent blue-green emission band at about 490 nm, and its XEL spectra show an intense emission band in the range of 360 to 500 nm with peak center at 400 nm. The light yield of Ba3ScB9O18 powders is about 23% as large as that of BGO powders under the same measurement conditions. There seems to be a certain relationship between the scintillation properties and the structural features of Ba3ScB9O18.

scholarly journals Aqueous synthesis of thioglycollic acid-capped Tb3+-doped cadmium sulfur quantum dots

2016 ◽  
Vol 7 ◽  
pp. 184798041668080
Author(s):  
Rongfang Wang ◽  
Xingming Wei ◽  
Pingfang Tao ◽  
Qinmin Wei ◽  
Pei Zhang ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Quantum Dots ◽  
Luminescence Properties ◽  
X Ray Diffraction ◽  
Rare Earth Ion ◽  
Aqueous Synthesis ◽  
Original Solution ◽  
Cubic Crystal ◽  
X Ray ◽  
Aqueous Method

Cadmium sulfur nanocrystals doped with the rare earth ion Tb3+ were synthesized using an easy aqueous method. Powder X-ray diffraction was used for the crystallography analysis of the nanocrystals. Results showed that cadmium sulfur: Tb3+ quantum dots had a cubic crystal structure. Effects of the pH of the original solution and Tb3+-dopant amount on luminescence properties of cadmium sulfur quantum dots were also systematically investigated. The luminescence properties of cadmium sulfur quantum dots were further improved using an appropriate Tb3+-dopant amount.

A zinc(II) coordination polymer containing single- and double-stranded helical chains: synthesis, crystal structure, and thermal and luminescence properties

2018 ◽  
Vol 73 (9) ◽  
pp. 655-660
Author(s):  
Fei-Hang Zhang ◽  
Nan-Nan Chai ◽  
Sheng-Chun Chen ◽  
Ming-Yang He ◽  
Qun Chen
Keyword(s):  
Crystal Structure ◽  
Coordination Polymer ◽  
Single Crystal ◽  
Network Architecture ◽  
Luminescence Properties ◽  
Two Dimensional ◽  
X Ray Diffraction ◽  
X Ray ◽  
Dimensional Network

AbstractA new zinc(II)-based coordination polymer {[Zn(5-fip)(tdbpy)]·(DMF)}n (1) {5-H2fip=5-fluoroisophthalic acid, tdbpy=4,4′-(2,4,8,10-tetraoxaspiro[5.5]undecane-3,9-diyl)bispyridine, DMF=dimethylformamide} has been solvothermally synthesized and structurally characterized. Single-crystal X-ray diffraction revealed that complex 1 shows a unique two-dimensional network architecture containing single-stranded [Zn(5-fip)]n and double-stranded helical [Zn(tdbpy)]n chains. The thermal and luminescence properties of complex 1 have also been studied.

Synthesis, Crystal Structure and Luminescence Properties of a Cyclometalated Ir(III) Complex of 3,4-Diphenylcinnoline

2010 ◽  
Vol 65 (4) ◽  
pp. 511-s518 ◽  
Author(s):  
Bi-Hai Tong ◽  
Fang-Hui Wu ◽  
Qun-Bo Mei ◽  
Qian-Feng Zhang
Keyword(s):  
Crystal Structure ◽  
Mass Spectroscopy ◽  
Luminescence Properties ◽  
Iridium Complex ◽  
X Ray Diffraction ◽  
Strong Emission ◽  
X Ray ◽  
H Nmr ◽  
Strong Emission Band ◽  
Ft Ir

An iridium(III) complex, [(dpci-H)2Ir(dafo)](PF6) (dpci-H = deprotonated 3,4-diphenylcinnoline, dpci; dafo = 4,5-diazafluoren-9-one), was synthesized from the reaction of the iridium complex [Ir(dpci-H)2(Cl)]2 and dafo in methanol, and characterized by single-crystal X-ray diffraction along with FT-IR, UV/Vis, 1H NMR and mass spectroscopy. The luminescence properties and the decay of the cyclometalated iridium(III) complex were also investigated. Excitation at the absorption wavelength (469 nm) resulted in a strong emission band centered at 591 nm with a lifetime of 0.9 μs.

scholarly journals Synthesis, crystal structure, polymorphism and microscopic luminescence properties of anthracene derivative compounds

2020 ◽  
Vol 76 (3) ◽  
pp. 427-435 ◽  
Author(s):  
Anna Moliterni ◽  
Davide Altamura ◽  
Rocco Lassandro ◽  
Vincent Olieric ◽  
Gianmarco Ferri ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Intermolecular Interactions ◽  
Crystal Packing ◽  
Building Blocks ◽  
Luminescence Properties ◽  
Fluorescence Lifetime Imaging ◽  
Optical Investigation ◽  
X Ray Diffraction ◽  
X Ray ◽  
Anthracene Derivative

Anthracene derivative compounds are currently investigated because of their unique physical properties (e.g. bright luminescence and emission tunability), which make them ideal candidates for advanced optoelectronic devices. Intermolecular interactions are the basis of the tunability of the optical and electronic properties of these compounds, whose prediction and exploitation benefit from knowledge of the crystal structure and the packing architecture. Polymorphism can occur due to the weak intermolecular interactions, requiring detailed structural analysis to clarify the origin of observed material property modifications. Here, two silylethyne-substituted anthracene compounds are characterized by single-crystal synchrotron X-ray diffraction, identifying a new polymorph in the process. Additionally, laser confocal microscopy and fluorescence lifetime imaging microscopy confirm the results obtained by the X-ray diffraction characterization, i.e. shifting the substituents towards the external benzene rings of the anthracene unit favours π–π interactions, impacting on both the morphology and the microscopic optical properties of the crystals. The compounds with more isolated anthracene units feature shorter lifetime and emission spectra, more similar to those of isolated molecules. The crystallographic study, supported by the optical investigation, sheds light on the influence of non-covalent interactions on the crystal packing and luminescence properties of anthracene derivatives, providing a further step towards their efficient use as building blocks in active components of light sources and photonic networks.

scholarly journals Photoluminescent Enhancement by Effect of Incorporation Nickel in ZnO Films Grown

2021 ◽  
Vol 6 (5) ◽  
pp. 177-180
Author(s):  
Delfino R. Gutiérrez ◽  
Tomás Díaz-Becerril ◽  
Godofredo García-Salgado ◽  
Antonio Coyopol-Solís ◽  
Enrique Rosendo-Andrés ◽  
...  
Keyword(s):  
Oxygen Vacancies ◽  
Surface Defects ◽  
Chemical Vapor ◽  
Green Emission ◽  
Zno Films ◽  
X Ray Diffraction ◽  
X Ray ◽  
Green Emission Band ◽  
The Right ◽  
Hot Filament

Microstructured films of undoped zinc oxide (ZnO) and ZnO doped with nickel (ZnO:Ni) were grown by hot filament chemical vapor deposition (HFCVD) technique on Si (100) substrates at 500 °C. Pellets of ZnO and ZnO:NiO as oxidant agenst were used. A shift to the right around 0.17 degree of the X-Ray Diffraction pattern of the ZnO:Ni film was observed with respect to undoped ZnO films. Morphologically by Scanning Electron Microscopy was noticed a Core-Shell type growth in ZnO undoped and a nanostructured type (Nano-wire) in ZnO doped with Ni. Photoluminescence measurements showed an increase in the intensity of the green emission band of ZnO:Ni. It was attributed to defects of oxygen vacancies (VO), zinc vacancies (VZn), zinc interstitials (Zni), oxygen interstitials (Oi), and oxygen vacancies complex (VO complex) in the structure of the film. The incorporation of Ni atoms in the ZnO structure stresses the crystal lattice, leaving behind a large number of surface defects that increase the emission of PL.

Synthesis, crystal structure, and luminescence properties of a new microporous europium silicate: Na3EuSi6O15·1.47H2O

RSC Advances ◽  
2015 ◽  
Vol 5 (37) ◽  
pp. 29121-29125 ◽  
Author(s):  
Wei Liu ◽  
Ying Ji ◽  
Fuyang Liu ◽  
Min Yang ◽  
Ying Wang ◽  
...  
Keyword(s):  
Crystal Structure ◽  
High Pressure ◽  
High Temperature ◽  
Single Crystal ◽  
Xrd Analysis ◽  
Luminescence Properties ◽  
X Ray Diffraction ◽  
X Ray

A new microporous europium silicate, Na3EuSi6O15·1.47H2O (denoted as 1), was synthesized under high-temperature and high-pressure conditions, and structurally characterized by single-crystal and powder X-ray diffraction (XRD) analysis.

scholarly journals The structure of kaliophilite KAlSiO4, a long-lasting crystallographic problem

IUCrJ ◽  
2020 ◽  
Vol 7 (6) ◽  
pp. 1070-1083 ◽  
Author(s):  
Enrico Mugnaioli ◽  
Elena Bonaccorsi ◽  
Arianna E. Lanza ◽  
Erik Elkaim ◽  
Virginia Diez-Gómez ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Rietveld Method ◽  
Structural Features ◽  
Unit Cell ◽  
X Ray Diffraction ◽  
Channel System ◽  
X Ray ◽  
Cell Parameters ◽  
Peak Broadening ◽  
Structure Solution

Kaliophilite is a feldspathoid mineral found in two Italian magmatic provinces and represents one of the 12 known phases with composition close to KAlSiO4. Despite its apparently simple formula, the structure of this mineral revealed extremely complex and resisted structure solution for more than a century. Samples from the Vesuvius–Monte Somma and Alban Hills volcanic areas were analyzed through a multi-technique approach, and finally the crystal structure of kaliophilite was solved using 3D electron diffraction and refined against X-ray diffraction data of a twinned crystal. Results were also ascertained by the Rietveld method using synchrotron powder intensities. It was found that kaliophilite crystallizes in space group P3 with unit-cell parameters a = 27.0597 (16), c = 8.5587 (6) Å, V = 5427.3 (7) Å3 and Z = 54. The kaliophilite framework is a variant of the tridymite topology, with alternating SiO4 and AlO4 tetrahedra forming sheets of six-membered rings (63 nets), which are connected along [001] by sharing the apical oxygen atoms. Considering the up (U) and down (D) orientations of the linking vertex, kaliophilite is the first framework that contains three different ring topologies: nine (1-3-5) (UDUDUD) rings, six (1-2-3) (UUUDDD) rings and twelve (1-2-4) (UUDUDD) rings. This results in a relatively open (19.9 tetrahedra nm−3) channel system with multiple connections between the double six-ring cavities. Such a framework requires a surprisingly large unit cell, 27 times larger than the cell of kalsilite, the simplest phase with the same composition. The occurrence of some Na for K substitution (3–10%) may be related to the characteristic structural features of kaliophilite. Micro-twinning, pseudo-symmetries and anisotropic hkl-dependent peak broadening were also detected, and they may account for the elusive character of the kaliophilite crystal structure.

Synthesis and crystal structure of C2/c Ca(Co,Mg)Si2O6 pyroxenes: effect of the cation substitution on cell volume

2017 ◽  
Vol 81 (5) ◽  
pp. 1129-1139 ◽  
Author(s):  
C. Gori ◽  
M. Tribaudino ◽  
L. Mantovani ◽  
G. D. Gatta ◽  
D. Delmonte ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Comparative Analysis ◽  
Diffraction Data ◽  
Divalent Cations ◽  
Structural Features ◽  
Cation Substitution ◽  
X Ray Diffraction ◽  
Synthesis And Crystal Structure ◽  
X Ray ◽  
Experimental Findings

AbstractA series of clinopyroxenes along the CaMgSi2O6–CaCoSi2O6 join was synthesized by quenching from melts at 1500°C and subsequent annealing at 1250°C (at 0.0001 GPa). This protocol proved to be the most effective to obtain homogenous, impurity-free and stoichiometric pyroxenes. Electron microprobe analyses in energy dispersive mode were conducted and single-crystal X-ray diffraction data were collected on Ca (CoxMg1-x)Si2O6 pyroxenes with x = 0.2, 0.4, 0.5, 0.6. Effects of cation substitution at the M1 site are described. The experimental findings of this study allow us to extend the comparative analysis of the structural features of pyroxenes with divalent cations at the M1 and M2 sites.

Ni2Sn2Zn from single-crystal X-ray diffraction

2012 ◽  
Vol 68 (10) ◽  
pp. i65-i67 ◽  
Author(s):  
Clemens Schmetterer ◽  
Divakar Rajamohan ◽  
Herta Silvia Effenberger ◽  
Hans Flandorfer
Keyword(s):  
Crystal Structure ◽  
Single Crystal ◽  
Structural Features ◽  
Lattice Parameter ◽  
X Ray Diffraction ◽  
Quaternary Compound ◽  
Space Group ◽  
X Ray

Dinickel ditin zinc, Ni2Sn2Zn, crystallizes in the cubic space group Pm\overline{3}m, with a lattice parameter ofa= 8.845 (1) Å and with all atoms occupying special positions. The crystal structure exhibits pronounced similarities with that of the quaternary compound Ni5.20Sn8.7Zn4.16Cu1.04. It shares structural features with other compounds in the Ni–Sn–Zn system, such as Ni5Sn4Zn and Ni3Sn2.

The Structural Side of Conjugation in Some Stable Primary Enamines and Related Systems

1996 ◽  
Vol 51 (7) ◽  
pp. 1053-1060 ◽  
Author(s):  
Dorothee Kowalski ◽  
Roland Frohlich ◽  
Gerhard Erker
Keyword(s):  
Crystal Structure ◽  
Structural Features ◽  
Measurable Effect ◽  
X Ray Diffraction ◽  
X Ray ◽  
Lone Pairs ◽  
Orthogonal Orientation ◽  
Planar Carbon

The structures of 1,6-diamino-1,6-diphenyl-1,3,5-hexatriene (2) and its 1,6-bis(N.N-bistrimethylsilylamino)-derivative (3) are compared. The X-ray crystal structure analyses of 2 and 3 show that turning off the conjugation with the nitrogen lone pairs by orthogonal orientation of the R2N-plane has no measurable effect on the structural features of the framework of the central planar carbon π-system. In a related substituent-stabilized primary enaminc (4) a slightly elongated C=C bond is found by X-ray diffraction.

Sign in / Sign up

Export Citation Format

Share Document