scholarly journals Influence of Al3+ co-doping on the spectral properties of europium doped Ca9Y(PO4)7

RSC Advances ◽  
2020 ◽  
Vol 10 (68) ◽  
pp. 41821-41829
Author(s):  
Karol Szczodrowski ◽  
Natalia Górecka ◽  
Marek Grinberg
Keyword(s):  
Spectral Properties ◽  
Pechini Method ◽  
Luminescent Materials ◽  
Co Doping ◽  
Aluminum Ions

A series of luminescent materials based on a calcium yttrium phosphate matrix doped with europium and different concentrations of aluminum ions (0, 5, 10% of mole) was synthesized using the Pechini method.

The influence of Si4+ co-doping on the spectroscopic properties of β-NaCaPO4:Eu2+/Eu3+

2019 ◽  
Vol 43 (8) ◽  
pp. 3409-3418
Author(s):  
N. Górecka ◽  
K. Szczodrowski ◽  
A. Lazarowska ◽  
M. Grinberg
Keyword(s):  
Calcium Phosphate ◽  
Pechini Method ◽  
Spectroscopic Properties ◽  
Luminescent Materials ◽  
Co Doping ◽  
Sodium Calcium ◽  
Silicon Ions

A series of luminescent materials based on a sodium calcium phosphate matrix doped with europium and different concentrations of silicon ions was synthesized using the Pechini method.

scholarly journals Fabrication and Spectral Properties of Wood-Based Luminescent Nanocomposites

2014 ◽  
Vol 2014 ◽  
pp. 1-4 ◽  
Author(s):  
Xianjun Li ◽  
Yun Li ◽  
Yongfeng Luo ◽  
Qunying Mou ◽  
Xingong Li ◽  
...  
Keyword(s):  
Blue Light ◽  
Conventional Method ◽  
Spectral Properties ◽  
Urea Formaldehyde ◽  
Broad Band ◽  
Green Emission ◽  
Formaldehyde Resin ◽  
Luminescent Materials ◽  
Bluish Green ◽  
Modified Wood

Pressure impregnation pretreatment is a conventional method to fabricate wood-based nanocomposites. In this paper, the wood-based luminescent nanocomposites were fabricated with the method and its spectral properties were investigated. The results show that it is feasible to fabricate wood-based luminescent nanocomposites using microwave modified wood and nanophosphor powders. The luminescent strength is in positive correlation with the amount of phosphor powders dispersed in urea-formaldehyde resin. Phosphors absorb UV and blue light efficiently in the range of 400–470 nm and show a broad band of bluish-green emission centered at 500 nm, which makes them good candidates for potential blue-green luminescent materials.

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.

Stabilization of Eu3+ under a reductive atmosphere by the Al3+ co-doping of Sr2SiO4:Eu2+/Eu3+

RSC Advances ◽  
2016 ◽  
Vol 6 (53) ◽  
pp. 48001-48008 ◽  
Author(s):  
Karol Szczodrowski ◽  
Justyna Barzowska ◽  
Natalia Górecka ◽  
Marek Grinberg
Keyword(s):  
Concentration Ratio ◽  
Oxidation States ◽  
Co Doping ◽  
Aluminum Ions ◽  
Reductive Atmosphere ◽  
The Eu

The incorporation of aluminum ions into the Sr2SiO4:Eu causes the stabilization of the Eu3+ ions under reductive atmosphere and concentration ratio of europium in both oxidation states ([Eu3+]/[Eu2+]) can be controlled by changing the Al3+ content.

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

Multifunctional luminescence properties of co-doped lanthanide metal organic frameworks

2015 ◽  
Vol 44 (20) ◽  
pp. 9588-9595 ◽  
Author(s):  
Shanghua Xing ◽  
Guang Zeng ◽  
Xiaomin Liu ◽  
Fen Yang ◽  
Zhiqiang Hao ◽  
...  
Keyword(s):  
Metal Organic Frameworks ◽  
Luminescent Materials ◽  
Temperature Dependent ◽  
Light Emitting ◽  
Co Doping ◽  
Wide Range ◽  
Metal Organic ◽  
Lanthanide Metal ◽  
Co Doped ◽  
Luminescence Behavior

Multifunctional luminescent materials of six Ln-MOFs have been designed and synthesized by the co-doping strategy. Thus a wide range of light emitting spectra and different temperature-dependent luminescence behavior were displayed.

Effect of Yb co-doping on the spectral properties of Er:YVO4 single crystal: A Judd Ofelt analysis

2018 ◽  
Vol 200 ◽  
pp. 280-286 ◽  
Author(s):  
M. Soharab ◽  
Indranil Bhaumik ◽  
R. Bhatt ◽  
A. Saxena ◽  
A.K. Karnal
Keyword(s):  
Single Crystal ◽  
Spectral Properties ◽  
Co Doping

Effects of Na+ on Spectral Properties of Er3+: CaF2 Transparent Ceramic

2012 ◽  
Vol 531-532 ◽  
pp. 307-311
Author(s):  
Wei Wei Li ◽  
Bing Chu Mei ◽  
Xiaonv Li ◽  
Jing Hong Song ◽  
Guang Lin Zhi
Keyword(s):  
Spectral Properties ◽  
Room Temperature ◽  
Dopant Concentration ◽  
Emission Spectra ◽  
Transparent Ceramic ◽  
Transparent Ceramics ◽  
Photoluminescence Properties ◽  
Pressing Method ◽  
Co Doping ◽  
Optimal Value

Er3+, Na+-co-doped CaF2 transparent ceramics with Er3+ dopant concentration of 5at% and Na+ of 0, 0.5, 1.0 and 1.5at% were fabricated by the vacuum hot pressing method. Absorption spectra, emission spectra and fluorescence lifetimes were measured at room temperature to study the effects of Na+ on the spectral properties of Er3+: CaF2 transparent ceramic. The results showed that after introducing Na ion into Er3+: CaF2 transparent ceramics, charge-neutralized Er3+-Na+ structure formed which prevented Er3+ from clustering, the absorption intensity of ceramics decreased with the increase of Na+ concentration, but the spectroscopy and photoluminescence properties of Er3+ in CaF2 transparent ceramic could be modulated by adjusting the concentration of Na+. Co-doping Na+ to increase fluorescence lifetime should have an optimal value.

Model of multicomponent narrow-band periodical non-stationary random signal

2020 ◽  
Vol 2020 (48) ◽  
pp. 17-24
Author(s):  
I.M. Javorskyj ◽  
◽  
R.M. Yuzefovych ◽  
P.R. Kurapov ◽  
◽  
...  
Keyword(s):  
Time Series ◽  
Real Time ◽  
Hilbert Transform ◽  
Spectral Properties ◽  
Narrow Band ◽  
Analytic Signal ◽  
Random Signal ◽  
Hilbert Transformation ◽  
The Hilbert Transform

The correlation and spectral properties of a multicomponent narrowband periodical non-stationary random signal (PNRS) and its Hilbert transformation are considered. It is shown that multicomponent narrowband PNRS differ from the monocomponent signal. This difference is caused by correlation of the quadratures for the different carrier harmonics. Such features of the analytic signal must be taken into account when we use the Hilbert transform for the analysis of real time series.

Structure and Spectral Properties of New Composites Based on Metal Alkanoates with Gold Nanoparticles

2015 ◽  
Vol 60 (04) ◽  
pp. 356-361 ◽  
Author(s):  
A. Tolochko ◽  
◽  
P. Teselko ◽  
A. Lyashchova ◽  
D. Fedorenko ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Spectral Properties
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