scholarly journals STUDY ON THERMOLUMINESCENCE PROPERTIES OF K2GdF5:Tb3+

2018 ◽  
Vol 56 (1A) ◽  
pp. 102
Author(s):  
Ha Xuan Vinh
Keyword(s):  
Solid State ◽  
Luminescence Property ◽  
Solid State Reaction Method ◽  
Nuclear Radiation ◽  
Main Peak ◽  
Radiation Doses ◽  
Orthorhombic Structure ◽  
Sem Images ◽  
Reaction Method ◽  
Wrinkled Surface

In this article, K2GdF5 substance was doped by various Tb3+ ion with concentrations 2, 5, 10, 15, 20 mol%, and the materials were synthesized by the solid state reaction method. The K2GdF5 material had orthorhombic structure of Pnam symmetry with the wrinkled surface structure  shown on SEM images. The fluorescence spectrum indicated that the luminescence property of this material was due to the Tb3+ ions. In the thermoluminescence (TL) investigation, the glow curves of K2GdF5:Tb3+ owned three peaks at 196, 236 and 305 °C when measuring at            2 °C/s heating rate, the main peak (at 196 oC) could be used to determine the dose by the TL method. The sensitivity, linearity and responsivity to different radiation doses of materials were also examined. In addition, some of the thermoluminescence responses of materials with neutron doses were also investigated. The results showed this materials own thermoluminescence properties, which could be applied in measuring nuclear radiation including neutron doses.

scholarly journals Effects of synthesizing time and Eu2+ concentration on photoluminescence properties of Ca2−xEuxMgSi2O7 phosphors

2021 ◽  
pp. 21410001
Author(s):  
Yu Fan ◽  
Chin-Ta Chen ◽  
Yen-Tsu Wang ◽  
Cheng-Fu Yang
Keyword(s):  
Solid State ◽  
Solid State Reaction ◽  
Solid State Reaction Method ◽  
Particle Sizes ◽  
Photoluminescence Excitation ◽  
Photoluminescence Properties ◽  
Sem Images ◽  
Photoluminescence Emission ◽  
Reaction Method ◽  
Pl Spectra

Phosphors with the compositions of [Formula: see text] ([Formula: see text], 0.015, 0.025, 0.035, and 0.045) are synthesized in a reduction atmosphere (5% H2 + 95% N2) using a solid-state reaction method. At first, the [Formula: see text] powder is synthesized at 1350[Formula: see text]C with a duration of [Formula: see text] h to find the optimum synthesizing time. SEM images show that the particle sizes increase with synthesizing time and as the synthesizing time is more than 4 h, the abnormal particles appear and the intensities at the emission peaks of photoluminescence excitation (PLE) and photoluminescence emission (PL) spectra decrease. Next, 1350[Formula: see text]C and 4 h are used as synthesized parameters, which are used to find the concentration quench effect of [Formula: see text] phosphors. As the concentration of [Formula: see text] ions of [Formula: see text] phosphors increases, the intensities at the emission peaks of PLE and PL spectra first increase and reach the maximum values at [Formula: see text], and then they decrease as the concentration of [Formula: see text] ions further increases. These results prove that the synthesizing time and concentration of [Formula: see text] ions are two important factors to affect the photoluminescence properties of [Formula: see text] phosphors.

Adsorption Performance of Li1.6Mn1.67O4 for Lithium Extraction from Geothermal Fluid of Lumpur Sidoarjo

2019 ◽  
Vol 964 ◽  
pp. 228-233
Author(s):  
Lukman Noerochim ◽  
Hadi Widjaja ◽  
Rindang Fajarin
Keyword(s):  
Grain Size ◽  
Solid State ◽  
Solid State Reaction ◽  
Spinel Structure ◽  
Solid State Reaction Method ◽  
Sem Images ◽  
Geothermal Fluid ◽  
Reaction Method ◽  
Adsorption Performance ◽  
Diffraction Peaks

In this work, Li1.6Mn1.67O4 is successfully prepared by solid state reaction method and firstly prepared as adsorbent for geothermal fluid of Lumpur Sidoarjo. XRD shows the all samples are indexed as Li1.6Mn1.67O4 with spinel structure. The further increase of calcination temperature, diffraction peaks of Li1.6Mn1.67O4 are growing strong and sharp, implying an improved crystallinity and an increased grain size. SEM images of LMO adsorbent show irregular shape with particles size in the range of 15-52 μm. Li1.6Mn1.67O4 at 700 oC has the highest capacity of lithium adsorption with capacity of 29.8 mg/g. It is attributed to the high crystalline of Li1.6Mn1.67O4 at 700 oC compared with other samples. In addition, the higher calcining temperature will result in the increasing grain size and crystallinity that enhance the adsorption performance of the Li1.6Mn1.67O4 adsorbent.

Fabrication and Properties of Zinc Silicate Phosphors through Solid State Reaction

2010 ◽  
Vol 160-162 ◽  
pp. 594-598
Author(s):  
Guo Jian Jiang ◽  
Jia Yue Xu ◽  
Hui Shen ◽  
Yan Zhang ◽  
Lin He Xu ◽  
...  
Keyword(s):  
Solid State ◽  
Solid State Reaction ◽  
Solid State Reaction Method ◽  
Emission Peak ◽  
Zinc Silicate ◽  
Red Phosphor ◽  
Reaction Method ◽  
Long Afterglow ◽  
Luminescent Mechanism ◽  
Silicate Phosphors

Zinc silicate-based (Zn2SiO4:Eu3+) long afterglow phosphors were produced by solid state reaction method. The effects of borax and Eu2O3 additive on the properties of fabricated products have been studied. The results show that, there is not much difference in phase compositions within the borax additive amount; however, their SEM morphologies are different. Borax additive can increase the grain size of the product. Some sintering phenomena could be observed in the sample with Eu2O3 addition. The fluorescence spectroscopy results indicate that, the emission peak of the sample with Eu3+ additive located at 612nm, which may be a good candidate for red phosphor applications. The luminescent mechanism of Zn2SiO4:Eu3+ is also discussed.

Luminescence properties of dysprosium doped calcium magnesium silicate phosphor by solid state reaction method

2015 ◽  
Vol 649 ◽  
pp. 1329-1338 ◽  
Author(s):  
Ishwar Prasad Sahu ◽  
Priya Chandrakar ◽  
R.N. Baghel ◽  
D.P. Bisen ◽  
Nameeta Brahme ◽  
...  
Keyword(s):  
Solid State ◽  
Solid State Reaction ◽  
Magnesium Silicate ◽  
Solid State Reaction Method ◽  
Luminescence Properties ◽  
Reaction Method ◽  
Silicate Phosphor ◽  
Calcium Magnesium
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