scholarly journals X-ray-activated, UVA persistent luminescent materials based on Bi-doped SrLaAlO4 for deep-Seated photodynamic activation

2021 ◽  
Vol 129 (12) ◽  
pp. 120901
Author(s):  
Bo-Mei Liu ◽  
Wei-Jiang Gan ◽  
Sun-Qi Lou ◽  
Rui Zou ◽  
Qiang Tang ◽  
...  
Keyword(s):  
Luminescent Materials ◽  
X Ray

scholarly journals Synthesis and Luminescent Properties of Eu3+/Tb3+ Rare Earth Ions Doped Li2SrSiO4 Phosphors

2018 ◽  
Vol 1 (1) ◽  
Author(s):  
Kaitao Yu ◽  
Lifang Wei ◽  
Jiaqi Shen
Keyword(s):  
Charge Transfer ◽  
Charge Transfer Band ◽  
Emission Spectra ◽  
Luminescent Properties ◽  
Rare Earth Ions ◽  
Luminescent Materials ◽  
Excitation Spectra ◽  
Solid State Method ◽  
X Ray ◽  
Uv Visible

The series of luminescent materials of Eu3 +, Tb3 + doped Li2SrSiO4 were synthesized by a high-temperature solid-state method. The phase purity of the samples was measured by X-ray powder diffraction (XRD). The luminescent properties of the samples were studied by UV-visible excitation spectra and emission spectra The It is found that the strong absorption of Eu3 + doped Li2-xSr1-xEuxSiO4 is from the 250 ~ 290 nm charge transfer band of Eu3 + and the 7F0 → 5L6 absorption transition of 393 nm. The strongest emission of the emission spectra at 393 nm is 614 nm and 701 nm, respectively, from the 5D0 → 7F2 and 5D0 → 7F4 transitions of Eu3 +. Tb3 + doped sample Li2-xSr1-xTb xSiO4 excitation spectrum is mainly composed of Tb3 + ion fd transition and charge transfer band composed of broadband, the strongest absorption at 269 nm, the emission of the main emission of 5D4 → 7F5 transition (542 nm).

Diamond–Rare Earth Composites with Embedded NaGdF4:Eu Nanoparticles as Robust Photo- and X-ray-Luminescent Materials for Radiation Monitoring Screens

2020 ◽  
Vol 3 (2) ◽  
pp. 1324-1331 ◽  
Author(s):  
Vadim Sedov ◽  
Sergey Kouznetsov ◽  
Artem Martyanov ◽  
Vera Proydakova ◽  
Victor Ralchenko ◽  
...  
Keyword(s):  
Rare Earth ◽  
Radiation Monitoring ◽  
Luminescent Materials ◽  
X Ray

Luminescent Materials on the Basis of Yttrium Oxide and Yttrium Aluminum Garnet Used for Photodynamic Therapy

2015 ◽  
Vol 670 ◽  
pp. 232-238 ◽  
Author(s):  
Vadim V. Bakhmetyev ◽  
Lev A. Lebedev ◽  
Anna B. Vlasenko ◽  
Sergey P. Bogdanov ◽  
Alexander E. Sovestnov ◽  
...  
Keyword(s):  
Photodynamic Therapy ◽  
Yttrium Aluminum Garnet ◽  
Pechini Method ◽  
Luminescent Materials ◽  
X Ray ◽  
High Temperature Synthesis ◽  
Yttrium Aluminum ◽  
Size Of Particles ◽  
High Level ◽  
Shs Method

Finely-dispersed phosphors of Y2O3:Eu and Y3Al5O12:Eu have been synthesized with the help of Pechini method and the method of self-propagating high-temperature synthesis (SHS). During the synthesis of phosphors on the basis of Y2O3 carried out with Pechini method the size of crystallites increases with the enlargement of concentration of yttrium, but it decreases when the method of SHS is applied. The structure of phosphors on the basis of Y3Al5O12 (YAG) is strongly amorphized. This fact agrees with the data of XRD and with the prevalence of the band with λmax = 613 nm in the spectra of this phosphor. The enlargement of yttrium concentration in it promotes the amorphisation of yttrium aluminum garnet and the decrease of a crystal phase content. The sample of Y3Al5O12:Eu synthesized with Pechini method has the maximum intensity, while in conditions of excitement with “high-level” X-ray radiation which corresponds to the radiation of industrial medical X-ray apparatus, the phosphor of Y2O3:Eu synthesized with the help of SHS showed the largest intensity. Colloid solutions prepared with the use of the samples synthesized by SHS method revealed a higher steadiness and a lower disposition to the sedimentation process. The samples of Y2O3:Eu phosphor possessing the smallest size of particles and the highest intensity of X-ray luminescence are the most suitable for the creation of pharmacological drugs used for photodynamic therapy.

Correlations Between Conditions of Synthesis, Phase Composition and Luminescent Properties of Eu - Polytantalate

2003 ◽  
Vol 796 ◽  
Author(s):  
Vladimir Vasilyev ◽  
Alvin Drehman ◽  
Lionel Bouthillette
Keyword(s):  
Phase Composition ◽  
Luminescent Properties ◽  
Luminescent Materials ◽  
Temperature Dependent ◽  
Sintered Ceramic ◽  
X Ray ◽  
Synthesis Conditions ◽  
Ceramic Thin Films ◽  
Synthesis Parameters ◽  
Temperature Dependent Photoluminescence

ABSTRACTCorrelations between synthesis conditions, phase composition, and spectral properties of the sintered ceramic, thin films and single crystals of EuTa7O19 phosphors have been studied using x-ray diffractometry and temperature dependent photoluminescence (PL) spectroscopy at temperatures between 18 K and 650 K. From the PL spectra of Eu3+, one can obtain information about the area of homogeneity of phases, their temperature transformations, and changes in the bonding character in the neighborhood of the luminescent ion. As a result, this information helps to optimize the synthesis parameters for luminescent materials.

Influence of Different Auxiliary Activators Doping on Spectral Properties of Sr3Al2O6: Eu2+ Phosphors

2012 ◽  
Vol 601 ◽  
pp. 54-58 ◽  
Author(s):  
Chao Xu ◽  
Dian Qing Lu ◽  
Hai Feng Jiang
Keyword(s):  
Spectral Properties ◽  
Emission Spectra ◽  
Luminescent Materials ◽  
X Ray Diffraction ◽  
Crystallographic Site ◽  
Excitation Spectra ◽  
X Ray ◽  
Efficient Energy ◽  
Long Afterglow ◽  
Energy Transfers

The long afterglow luminescent materials Sr3Al2O6: Eu2+, Re3+ ( Re= La, Ce, Pr, Nd, Sm, Gd, Dy, Er) were synthesized via solid-state reaction. X-ray diffraction and fluorescence spectrophotometer were employed to characterize the phosphors. The excitation spectra were all well simulated by eight Gaussian curves, indicating that they originated from the 4f7 (8S7/2) – 4f65d (8HJ) transitions of Eu2+ ions. The excitation spectra intensity of Sr3Al2O6: Eu2+, Sm3+ is much stronger than the others, which indicates that there is a more efficient energy transfers from Sm3+ to Eu2+. The simulated results of the emission spectra showed that they generated from the Eu2+ ions in the Sr2+ sites of SrO6 and SrO7 polyhedral, which indicated that the Eu2+ ions were apt to occupy low-coordination crystallographic site. The proposed explanation for excitation spectra and emission spectra property were also discussed

Preparation and Research of Long Afterglow Luminescent Materials

2013 ◽  
Vol 320 ◽  
pp. 123-127
Author(s):  
Wen Feng Xu ◽  
Xue Zhang ◽  
Ling Zhang ◽  
Shan Quan Jiang
Keyword(s):  
Low Temperatures ◽  
Lower Cost ◽  
Sol Gel ◽  
Luminescence Spectra ◽  
Phase Identification ◽  
Luminescent Materials ◽  
X Ray Diffraction ◽  
X Ray ◽  
Carbon Reduction ◽  
Long Afterglow

In this paper, sol-gel method at low temperatures, an atmosphere of carbon reduction to replace the use of cyclodextrin system prepared with citric acid as SrAl2O4: Eu2+, Dy3+ Long Afterglow Phosphors nanotechnology. And the use of X-ray diffraction phase identification and fluorescence spectrophotometer with the excitation spectrum of the sample, luminescence spectra and luminescence afterglow to explore research, results show that product with the lower cost has the luminescence properties.

Europium nitride synthesized by direct nitridation with ammonia

2005 ◽  
Vol 20 (1) ◽  
pp. 40-42 ◽  
Author(s):  
T. Suehiro ◽  
N. Hirosaki ◽  
T. Wada ◽  
Y. Yajima ◽  
M. Mitomo
Keyword(s):  
Powder Diffraction ◽  
Oxide Phase ◽  
Appreciable Amount ◽  
Composition Analysis ◽  
Luminescent Materials ◽  
X Ray ◽  
Oxygen Dissolution ◽  
Direct Nitridation ◽  
Free Environment ◽  
Nitrided Sample

Europium nitride (EuN), which is potentially used as an activator for nitride luminescent materials, was prepared by direct nitridation at 600 °C in a NH3 atmosphere. X-ray powder diffraction and composition analysis of the nitrided sample were carefully conducted under an oxygen-free environment. The nitrided sample was found to be mononitride with NaCl structure. An appreciable amount of oxygen (∼0.06 a.u.) was detected, but no secondary oxide phase was found. The results suggest oxygen dissolution into the lattice of EuN.

The non-isomorphous crystal structures of NHC—Au—Cl and NHC—Au—Br (NHC is 1,3-dibenzyl-4,5-diphenylimidazol-2-ylidene)

2016 ◽  
Vol 72 (11) ◽  
pp. 857-860 ◽  
Author(s):  
Matthias Tacke ◽  
Oyinlola Dada ◽  
Cillian O'Beirne ◽  
Xiangming Zhu ◽  
Helge Müller-Bunz
Keyword(s):  
Crystal Structures ◽  
Anticancer Drugs ◽  
Luminescent Materials ◽  
X Ray ◽  
X Ray Crystallography ◽  
Independent Molecules

Gold monochloride and monobromide can be transformed into monomeric complexes by ligands such as CO, PPh3or Me2S, and such ligand-stabilized gold monochloride compounds have been investigated as catalysts, luminescent materials and anticancer drugs, especially when coordinated to a lipophilic benzyl-substituted N-heterocyclic carbene (NHC) ligand. The triclinic structures of NHC–Au–Cl {chlorido(1,3-dibenzyl-4,5-diphenylimidazol-2-ylidene)gold, [AuCl(C29H24N2)]} and NHC—Au—Br {bromido(1,3-dibenzyl-4,5-diphenylimidazol-2-ylidene)gold, [AuBr(C29H24N2)]}, determined by X-ray crystallography at 100 K, have one and four molecules, respectively, in their asymmetric units. The chloride compound shows an almost linear C—Au—Cl fragment [179.76 (8)°], with an Au—C distance of 1.976 (3) Å and an Au—Cl distance of 2.3013 (6) Å, while the bromide compound shows surprisingly large geometry deviations, from 1.969 (12) to 2.016 (10) Å for the Au—C distance and from 2.4279 (14) to 2.4796 (12) Å for the Au—Br distance, in the four independent molecules.

Combustion Synthesis of Long Afterglow luminescent Materials Sr2-xCaxMgSi2O7:Eu2+,Dy3+

2011 ◽  
Vol 287-290 ◽  
pp. 213-216 ◽  
Author(s):  
Yong Qiang Zhou ◽  
Yi Guang Tian ◽  
He Shan Ying
Keyword(s):  
Single Phase ◽  
Combustion Method ◽  
Process Conditions ◽  
Luminescent Materials ◽  
X Ray Diffraction ◽  
Solid Reaction ◽  
X Ray ◽  
Long Afterglow ◽  
Long Wave ◽  
Luminescence Performance

Long afterglow luminescent materials Sr2-xCaxMgSi2O7:Eu2+,Dy3+ （x=0-1.955）was synthesized by combustion method and characterized by X－ray diffraction,fluorescencespectrum and so on. Its preparing process conditions,the effect of Ca2+ replacing Sr2+ on its Luminescent performance were discussed. The results show it has a single phase and foamy structure,which is easy to be grinded into superfine powders. Its Luminescent property is importantly affected by water dosage(R= nH2O /nTEOS), reducer dosage (H=nreducer /nnitrate), gel grain dosage , gel grain size, arousing-burning temperature and burning time. Its best preparing process conditions are determined. A small quantity of Ca2+ replacing Sr2+ can raise its luminescence performance. Increasing Ca2+ content, its emission peak gradually wave to the long wave traverse, its luminous colors change from blue to yellow. Compared with the sample synthesized by high temperature solid reaction,the emission peaks of the sample synthesized by combustion method distinctly take place red shift.

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