Investigation of the Solid-Solution Limit, Crystal Structure, and Thermal Quenching Mitigation of Sr-Substituted Rb2CaP2O7:Eu2+ Phosphors for White LED Applications

2022 ◽  
Author(s):  
Kai Zhao ◽  
Li Yin ◽  
Zhihong Ma ◽  
Tingxuan Yang ◽  
Huidong Tang ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Solid Solution ◽  
Thermal Quenching ◽  
White Led

New Green Phosphor Ba3Si6O12N2:Eu for White LED: Crystal Structure and Optical Properties

2008 ◽  
Vol 403 ◽  
pp. 11-14 ◽  
Author(s):  
Masayoshi Mikami ◽  
Satoshi Shimooka ◽  
Kyota Uheda ◽  
Hiroyuki Imura ◽  
Naoto Kijima
Keyword(s):  
Crystal Structure ◽  
Thermal Quenching ◽  
First Principles Calculation ◽  
White Led ◽  
Green Phosphor ◽  
Near Ultraviolet ◽  
Light Excitation ◽  
Led Backlight ◽  
Green Photoluminescence ◽  
High Color Purity

A new oxynitride, Ba3Si6O12N2, has been synthesized. The crystal structure has been successfully determined by close collaboration between experiment and first-principles calculation. This compound doped with Eu exhibits intense green photoluminescence with high color purity under near-ultraviolet to blue light excitation; in particular, it has much less thermal quenching than (Ba,Sr,Eu)2SiO4. Thus (Ba,Eu)3Si6O12N2 appears promising green phosphor for white LED backlight for display. The atomic/electronic structure is discussed in comparison with Ba3Si6O9N4, which could not become efficient phosphor by doping Eu due to strong thermal quenching at room temperature.

Crystal structure of U1-yLnyO2-x (Ln = Gd, Er) solid solution

2021 ◽  
pp. 153189
Author(s):  
Pham Van Mao ◽  
Tatsumi Arima ◽  
Yaohiro Inagaki ◽  
Kazuya Idemitsu ◽  
Daisuke Akiyama ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Solid Solution

The Crystal Structure of Bi2PbMnO4(PO4)2, a Member of a New Solid Solution Series in the Bi–Pb–Mn–P Oxide System

2002 ◽  
Vol 165 (2) ◽  
pp. 324-333 ◽  
Author(s):  
Olivier Cousin ◽  
Marielle Huve ◽  
Pascal Roussel ◽  
Olivier Perez ◽  
Hugo Steinfink
Keyword(s):  
Crystal Structure ◽  
Solid Solution ◽  
Oxide System ◽  
Solid Solution Series ◽  
Solution Series

New insights into the 6H-type hexagonal perovskite solid solution BaTiO3−δ: Influence of acceptor and donor doping on crystal structure and electrical properties

2017 ◽  
Vol 310 ◽  
pp. 154-165 ◽  
Author(s):  
Fayçal Bourguiba ◽  
Ah. Dhahri ◽  
S.E.L. Kossi ◽  
J. Dhahri ◽  
K. Khirouni ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Solid Solution ◽  
Electrical Properties ◽  
Donor Doping

scholarly journals Ge0.57Ti0.43O2: a new high-pressure material with rutile-type crystal structure

2018 ◽  
Vol 74 (7) ◽  
pp. 1010-1012 ◽  
Author(s):  
Emil Stoyanov ◽  
Kurt Leinenweber ◽  
Thomas L. Groy ◽  
Abds-Sami Malik
Keyword(s):  
Crystal Structure ◽  
Solid Solution ◽  
High Pressure ◽  
Single Crystals ◽  
Structure Type ◽  
Site Symmetry ◽  
Rutile Structure ◽  
High Pressure And Temperature ◽  
Atom Position ◽  
Type Crystal

Single crystals of a GeO2–TiO2 solid solution with the corresponding composition Ge0.57Ti0.43O2 (germanium titanium tetraoxide) were obtained by devitrification of germania-titania glass at high pressure and temperature. The new compound crystallizes in the rutile structure type (space group P42/mnm), where Ge and Ti share the same position M (site symmetry m.mm), with occupancy values of 0.57 (3) and 0.43 (3), respectively, and one O-atom position (m.2m). The M site is in a sixfold O-atom coordination and, as in the original TiO2 rutile structure, an elongation of the O—M—O bonds along the c-axis direction of the coordination polyhedron and deviation of the angles from 90° lead to a decrease in the coordination symmetry from octahedral to tetragonal. The Ge and Ti atoms are fully disordered in the structure, which indicates that the rutile structure is surprisingly pliant given the differing sizes of the two cations.

scholarly journals Люминофоры холодного голубого излучения на основе оксида алюминия, допированного диспрозием

2022 ◽  
Vol 64 (1) ◽  
pp. 95
Author(s):  
И.В. Бакланова ◽  
В.Н. Красильников ◽  
А.П. Тютюнник ◽  
Я.В. Бакланова
Keyword(s):  
Crystal Structure ◽  
Phase Composition ◽  
Diffraction Analysis ◽  
Powder Diffraction ◽  
Thermal Quenching ◽  
Emission Spectra ◽  
X Ray ◽  
White Emission ◽  
Uv Excitation ◽  
Quenching Of Luminescence

Al2О3:Dy3+ oxides with different colors luminescence were synthesized using precursor technology. The phase composition and crystal structure of the obtained materials were established by X-ray powder diffraction analysis. The excitation and emission spectra, decay curves, thermal quenching of luminescence were studied. Under UV excitation, the phosphors exhibit blue, purplish blue, white emission depending on the concentration of dysprosium and the temperature of annealing of the Al1-xDyx(OH)(HCOO)2 precursor in air.

Microstructure and Hydrogen Permeability of Duplex Phase M-ZrNi (M=V, Nb, Ta) Alloys

2006 ◽  
Vol 980 ◽  
Author(s):  
Kazuhiro Ishikawa ◽  
Naoshi Kasagami ◽  
Tomoyuki Takano ◽  
Kiyoshi Aoki
Keyword(s):  
Crystal Structure ◽  
Solid Solution ◽  
High Performance ◽  
Gas Flow ◽  
Hydrogen Permeation ◽  
Hydrogen Permeability ◽  
The Other ◽  
Cast State ◽  
X Ray ◽  
Scanning Electron

AbstractIn order to develop non-Pd based high performance hydrogen permeation alloys, microstructure, crystal structure and hydrogen permeability of duplex phase M-ZrNi (M=V and Ta) alloys were investigated using a scanning electron microscope, an X-ray diffractometer and a gas flow meter. These results were compared with those of Nb-ZrNi ones which have been previously published. The hydrogen permeation was impossible in the V-ZrNi alloys, because they were brittle in the as-cast state. On the other hand, duplex phase alloys consisting of the bcc-(Ta, Zr) solid solution and the orthorhombic ZrNi (Cmcm) intermetallic compound were formed and hydrogen permeable in the Ta-ZrNi system. The Ta40Zr30Ni30 alloy shows the highest value of hydrogen permeability of 4.1×10-8 [molH2m-1s-1Pa-0.5] at 673 K, which is three times higher than that of pure Pd.

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