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Studies on long lasting optical properties of Eu^(2+) and Dy^(3+) doped di-barium magnesium silicate phosphors

Chinese Chemical Letters 2015年第9期26卷 1187-1190页

作者： Ravi Shrivastava jagjeet kaur Govt.VYT PG Autonomous College

Di-barium magnesium silicate phosphors doped with europium and dysprosium were prepared under a weak reducing atmosphere.X-ray diffraction pattern of the sample was also done that confirmed the proper preparation of the *** electron microscope（SEM） images confirmed that the sample has regular surface and uniform grain size *** studies of phosphorescence decay of Ba2MgSi2O7：Eu^2＋,Dy^3＋ phosphors with different concentration of Dy^3＋ were *** phosphor with 0.5/1.5 mol%of Eu/Dy,exhibited optimum green color afterglow *** emission is expected to arise due to transition of Eu^2＋ ions from any of the sublevels of 4f^65d^1 configuration to ^8S（7/2） level of the 4f7 *** a suitable trap depth,the trap concentration is expected to be proportional to the concentration of Dy^3＋.These traps are responsible for holding the charge career for a reasonable time,subsequently for increasing the time of ***,optimum Dy3＊ concentration produces the longer afterglow duration with higher intensity of luminescence *** depth were also calculated using thermoluminescence glow curve which was indicative of formation of traps suitable for long afterglow.

关键词： Phosphorescence XRD Persistence luminescence Trapping center

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Effect of temperature on the ML of Au doped(Zn,Cd)S mixed phosphors

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Chinese Chemical Letters 2011年第6期22卷 709-712页

作者： jagjeet kaur N.S.Suryanarayana Vikas Dubey Department of Physics Govt.Vishwanath Yadav Tamaskar Post Graduate Autonomous College Durg(C.G.)India

In this paper the effect of temperature on the mechanoluminescence of Au doped phosphors of（Zn,Cd）S is *** is found that the ML disappears beyond a particular *** temperature dependence of ML intensity follows the relation I =I_T^O（1-TIT_C）~n,where I_T^O is a constant,n is the slop of log I_T versus log（1- TIT_C） plot which lies between 0.9 and 1.10,T_C is the temperature at which ML *** is found that the ML intensity in（Zn,Cd）S：Au disappear at 600 K.

关键词： Mechanoluminescence Temperature dependence in Ⅱ-Ⅵ semiconductors

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Study of Propagation of Ion Acoustic Waves in Argon Plasma

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Journal of Modern Physics 2010年第4期1卷 281-289页

作者： N. S. Suryanarayana jagjeet kaur Vikas Dubey 不详

The properties of small amplitude acoustic waves (IAW) in unmagnetised plasma have been discussed in detail. An experimental set up to study the propagation of IAW in argon plasma has been descried. The speed of IAW under different conditions of discharge current and pressure has been measured from the time-of flight technique. From these measurements, electron temperatures have been calculated. The results have been compared with those obtained by single probe method, and were found to be in good agreement with each other so IAW speeds can be used to calculate plasma parameters.

关键词： IAW in Argon Plasma Study of Propagation

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TL Glow Curve Study, Kinetics, PL and XRD Analysis of Mn2+Doped CaAl2O4Phosphors

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Journal of Minerals and Materials Characterization and Engineering 2012年第11期11卷 1081-1084页

作者： jagjeet kaur Nemana Subramanyam Suryanarayana Beena Jaykumar Vikas Dubey Ravi Shrivastava Huma Nazli Baig Department of Physics Vishwanath Yadav Tamaskar Post Graduate Autonomous College Durg India

The present paper reports Thermoluminescence (TL) Glow curve of Mn2+ doped CaAl2O4 phosphor with different UV exposure time. The Glow peak shows general order kinetics and evaluation of kinetic parameters was done by peak shape method. Calculations of Trap Depth were done with Chen’s different methods and order of kinetics, activation energy and frequency factor are calculated. The recorded glow curve shifts towards higher temperature with increasing intensity as a function of UV exposure time until 30 minutes where it is seen that the peak shifts towards low temperature side and intensity also decreases. The peaks were found at 345?C, 356.83?C, 358?C and 356.73?C respectively using the heating rate 6.7?C/s. The PL (photoluminescence) excitation spectra show peaks at 248 nm and 362 nm whereas emission spectra shows peaks between 364 nm and 551 nm. Sample was characterized by XRD technique.

关键词： Phosphors Photoluminescence Thermoluminescence Kinetic Parameters Trap Depth

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Novel Sources of Combined Resistance Against Rice Root-Knot Nematode and Brown Spot Disease in Oryza rufipogon

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Rice science 2023年第6期30卷 504-508页

作者： Anupam SEKHON Narpinderjeet kaur DHILLON Dharminder BHATIA jagjeet Singh LORE Harwinder Singh BUTTAR Department of Plant Pathology Punjab Agricultural UniversityLudhiana 141004India Department of Plant Breeding and Genetics Punjab Agricultural UniversityLudhiana 141004India

Rice root-knot nematode(RRKN,Meloidogyne graminicola)and brown spot(BS,Drechslera oryzae)are serious constraints on the quality of rice grains,particularly under direct-seeded rice conditions in many parts of the *** rice varieties resistant to RRKN and BS will be the most effective and environmentally friendly management strategy.A total of 93 and 58 Oryza rufipogon accessions were screened against RRKN and BS,respectively,for two years under artificial inoculation *** the 93 *** accessions。

关键词： rufipogon Root Meloidogyne

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