3T1R model and tuning of thermoluminescence intensity by optimization of dopant concentration in monoclinic Gd2O3:Er3+;Yb3+ co-doped phosphor

2017 ◽  
Vol 19 (22) ◽  
pp. 14680-14694 ◽  
Author(s):  
Raunak Kumar Tamrakar ◽  
Kanchan Upadhyay ◽  
D. P. Bisen
Keyword(s):  
Dopant Concentration ◽  
Thermoluminescence Property ◽  
Co Doped

Thermoluminescence property of a phosphor is an important parameter that helps to determine the use of a phosphor in various dosimetric applications.

scholarly journals Correction: 3T1R model and tuning of thermoluminescence intensity by optimization of dopant concentration in monoclinic Gd2O3:Er3+;Yb3+ co-doped phosphor

2019 ◽  
Vol 21 (4) ◽  
pp. 2196-2196
Author(s):  
Raunak Kumar Tamrakar ◽  
Kanchan Upadhyay ◽  
D. P. Bisen
Keyword(s):  
Dopant Concentration ◽  
Chem Phys ◽  
Co Doped ◽  
Phys Chem Chem Phys

Correction for ‘3T1R model and tuning of thermoluminescence intensity by optimization of dopant concentration in monoclinic Gd2O3:Er3+;Yb3+ co-doped phosphor’ by Raunak Kumar Tamrakar et al., Phys. Chem. Chem. Phys., 2017, 19, 14680–14694.

The dopant concentration and annealing temperature dependence of ferromagnetism in Co-doped ZnO thin films

2008 ◽  
Vol 254 (16) ◽  
pp. 4956-4960 ◽  
Author(s):  
Xiao-Hong Xu ◽  
Xiu-Fang Qin ◽  
Feng-Xian Jiang ◽  
Xiao-Li Li ◽  
Ya Chen ◽  
...  
Keyword(s):  
Thin Films ◽  
Temperature Dependence ◽  
Annealing Temperature ◽  
Dopant Concentration ◽  
Zno Thin Films ◽  
Doped Zno ◽  
Co Doped ◽  
Annealing Temperature Dependence

scholarly journals Microstructural Evolution and High-Performance Giant Dielectric Properties of Lu3+/Nb5+ Co-Doped TiO2 Ceramics

Molecules ◽  
2021 ◽  
Vol 26 (22) ◽  
pp. 7041
Author(s):  
Noppakorn Thanamoon ◽  
Narong Chanlek ◽  
Pornjuk Srepusharawoot ◽  
Ekaphan Swatsitang ◽  
Prasit Thongbai
Keyword(s):  
Dielectric Properties ◽  
Grain Boundaries ◽  
Dopant Concentration ◽  
Dielectric Behavior ◽  
Second Phase ◽  
Doped Tio2 ◽  
Dielectric Relaxations ◽  
Giant Dielectric ◽  
Second Phase Particles ◽  
Co Doped

Giant dielectric (GD) oxides exhibiting extremely large dielectric permittivities (ε’ > 104) have been extensively studied because of their potential for use in passive electronic devices. However, the unacceptable loss tangents (tanδ) and temperature instability with respect to ε’ continue to be a significant hindrance to their development. In this study, a novel GD oxide, exhibiting an extremely large ε’ value of approximately 7.55 × 104 and an extremely low tanδ value of approximately 0.007 at 103 Hz, has been reported. These remarkable properties were attributed to the synthesis of a Lu3+/Nb5+ co-doped TiO2 (LuNTO) ceramic containing an appropriate co-dopant concentration. Furthermore, the variation in the ε’ values between the temperatures of −60 °C and 210 °C did not exceed ±15% of the reference value obtained at 25 °C. The effects of the grains, grain boundaries, and second phase particles on the dielectric properties were evaluated to determine the dielectric properties exhibited by LuNTO ceramics. A highly dense microstructure was obtained in the as-sintered ceramics. The existence of a LuNbTiO6 microwave-dielectric phase was confirmed when the co-dopant concentration was increased to 1%, thereby affecting the dielectric behavior of the LuNTO ceramics. The excellent dielectric properties exhibited by the LuNTO ceramics were attributed to their inhomogeneous microstructure. The microstructure was composed of semiconducting grains, consisting of Ti3+ ions formed by Nb5+ dopant ions, alongside ultra-high-resistance grain boundaries. The effects of the semiconducting grains, insulating grain boundaries (GBs), and secondary microwave phase particles on the dielectric relaxations are explained based on their interfacial polarizations. The results suggest that a significant enhancement of the GB properties is the key toward improvement of the GD properties, while the presence of second phase particles may not always be effective.

Multi-band photon avalanche controlling performance of BiOCl:Er3+ crystals through facile Yb3+ doping

2015 ◽  
Vol 3 (33) ◽  
pp. 8559-8565 ◽  
Author(s):  
Yongjin Li ◽  
Zhiguo Song ◽  
Ronghua Wan ◽  
Qun Liu ◽  
Yuting Zhou ◽  
...  
Keyword(s):  
Near Infrared ◽  
Dopant Concentration ◽  
Infrared Emission ◽  
Emission Behavior ◽  
Near Infrared Emission ◽  
Co Doped ◽  
Multi Band

Photon avalanche (PA) emission behavior of Er3+ ion at violet, green, red and near infrared emission bands were controlled through the Yb3+ dopant concentration in Er3+–Yb3+ co-doped BiOCl crystals.

scholarly journals PENGARUH PENAMBAHAN CO-DOPING Mg/La TERHADAP KARAKTERISASI TiO2 SEBAGAI FOTOELEKTRODA

2021 ◽  
Vol 9 (1) ◽  
pp. 79-86
Author(s):  
Mursal Mursal ◽  
◽  
Nurul Azmi ◽  
Ismail Ismail ◽  
◽  
...  
Keyword(s):  
Doping Concentration ◽  
Crystal Size ◽  
Energy Gap ◽  
Dopant Concentration ◽  
Sol Gel ◽  
Pure Tio2 ◽  
Tio2 Sample ◽  
Doped Tio2 ◽  
Co Doping ◽  
Co Doped

The effect of Mg/La co-doping addition on the caracteristics of TiO2 as photoelectrode have been studied. This study aims to investigate the effect of Mg/La co-doping concentration on the characteristics of TiO2. This study aims investigate the effect of Mg/La co-doping concentration on the characteristics of TiO2. Mg/La was varied from 0% mol, 0.4 / 0.6% mol, and 0.6 / 0.4% mol. Synthesis of TiO2 co-doping Mg/La was done by sol gel method. The resulting of powder pure TiO2 and co-doping Mg/La was made to paste, and was deposited on a glass substrate with a size of 2.5 x 2.5 cm and sintered at 600°C for 1 hour. Mg / La co-doped TiO2 layers were characterized using XRD, UV-Vis, and FTIR spectrometers. The results showed that TiO2 was the mos dominan phase appeared in pure TiO2 sample. The phase of MgO, MgTiO3, Mg2TiO4, and La2O3 were found in Mg/La co-doped TiO2 samples. The crystal size of Mg/La co-doped TiO2 was varied from 8.85 to 7.70 nm. In this research, we obtained that the energy gap was varied from 3.52 to 3.5 eV depent on co-dopant concentration. FTIR measurement showed groups of Ti-O, Ti-O-Ti, Ti-O-O, and H-O.

scholarly journals Effects of Sr and Mn co-doping on microstructural evolution and electrical properties of LaAlO3

2019 ◽  
Vol 13 (4) ◽  
pp. 333-341
Author(s):  
Lúcia Villas-Boas ◽  
Celso Goulart ◽  
de Ferreira
Keyword(s):  
Electrical Conductivity ◽  
Catalytic Activity ◽  
Electrical Properties ◽  
Perovskite Structure ◽  
Dopant Concentration ◽  
Microstructural Development ◽  
Co Doping ◽  
Total Electrical Conductivity ◽  
Electrode Reactions ◽  
Co Doped

In this work, we investigate the effects of Sr and Mn co-doping on the microstructural development and electrical properties of LaAlO3 synthesised by solid state reaction and sintered at 1500 and 1600?C. The addition of Sr and Mn contributed to the crystallization and stabilization of the perovskite structure. However, the addition of Sr alone lead to the formation of heterogeneous microstructure, while the combined effect of Sr and Mn improved Al and La homogeneity in the perovskite structure. Total electrical conductivity is enhanced by three orders of magnitude with Sr addition (La0.8Sr0.2AlO3-?: 5.74 ? 10?4 S/cm at 600?C) and five orders of magnitude with Mn co-doping (La0.8Sr0.2Al0.8Mn0.2O3-?: 3.6 ? 10?2 S/cm at 600?C) compared to the undoped LaAlO3 (2.96 ? 10?6 S/cm at 600?C). The Sr and Mn co-doped LaAlO3 present favourable catalytic activity for electrode reactions even with a low dopant concentration (20mol%).

Effect of Dopant Concentration of N, Fe Co-Doped TiO2 on Photodegradation of Methylene Blue under Ordinary Visible Light

2014 ◽  
Vol 661 ◽  
pp. 34-38 ◽  
Author(s):  
Arman Sikirman ◽  
Jagannathan Krishnan ◽  
Elvana Nerissa Mohamad
Keyword(s):  
Methylene Blue ◽  
Visible Light ◽  
Physical Properties ◽  
Crystal Size ◽  
Dopant Concentration ◽  
Irradiation Time ◽  
Titanium Tetraisopropoxide ◽  
Solgel Method ◽  
High Dopant Concentration ◽  
Co Doped

The effect of dopant concentration on N, Fe co-doped TiO2 for photodegradation of methylene blue under ordinary visible light was investigated. The photocatalyst samples were prepared using solgel method with titanium tetraisopropoxide as precursor of titania. The dopant concentrations were varied from 0.50% and 1.0% and the calcinations temperature was fixed at 600oC. The prepared photocatalysts were characterized using XRD and FTIR to determine their physical properties. The results from XRD proved that photocatalyst with dopant concentration of 1.0% N, 1.0% Fe-TiO2 showing highly desirable properties in phase and crystal size. The results from FTIR revealed the presence of both the dopants in the samples. The effectivity of photocatalysts was tested by performing a standard batch photocatalytic degradation experiment with methylene blue as a model pollutant under ordinary visible light. The result showed that photocatalyst with high dopant concentration for both nitrogen and ferrum dopant (1.0 % N, 1.0% Fe-TiO2) yielded a maximum of 80.50% methylene blue degraded within five hours of irradiation time.

Dependence of the up-conversion emission of Li+ co-doped Y2O3:Er3+ films with dopant concentration

2015 ◽  
Vol 167 ◽  
pp. 352-359 ◽  
Author(s):  
A.N. Meza-Rocha ◽  
E.F. Huerta ◽  
U. Caldiño ◽  
S. Carmona-Téllez ◽  
M. Bettinelli ◽  
...  
Keyword(s):  
Dopant Concentration ◽  
Co Doped
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