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Devender Singh,Vijeta Tanwar,Anura Priyajith Samantilleke,Bernabe Mari,Shri Bhagwan,Krishan Chander Singh,Pratap Singh Kadyan,Ishwar Singh 대한금속·재료학회 2017 ELECTRONIC MATERIALS LETTERS Vol.13 No.3
Eu2+ and Eu2++Ln3+ doped SrAl4O7 nanophosphors were synthesized byrapid gel combustion process. The morphology of prepared phosphorswas examined with scanning and transmission electron microscopy. The phase identification and the crystal structures of nanophosphorswere studied using X-ray powder diffraction techniques. Luminescencecharacteristics of the prepared nanophosphors were analyzed on accountof excitation, emission and phosphorescence decay analysis. Theemission spectra demonstrated the broad green emission attributed to4f65d1→ 4f7 transition of the Eu2+ ions. The effect of codoping of sometrivalent lanthanide (Dy3+, Pr3+ and Y3+) ions were investigated forimproving the emission intensity and phosphorescence decay time ofthe basic lattice of SrAl4O7:Eu2+ phosphors. The synthesized materialshad enhanced bright luminescent properties that could suitably beapplied for display as well as photovoltaic applications.
Gupta Isha,Singh Sitender,Kumar Pawan,Bhagwan Shri,Kumar Vinod,Singh Devender 한국물리학회 2022 Current Applied Physics Vol.43 No.-
Cost-effective urea assisted solution combustion (SC) synthetic method was employed to prepare a series of doped YAlO3:xDy3+ (0.01–0.08 mol) phosphors. The resulting powdered samples were comprehensively examined through various structural as well as optical measurements. Rietveld refinement studies concluded that prepared nanomaterials structured into the orthorhombic system having Pbnm (62) space group. Energy dispersive spectral (EDS) analysis was executed to observe the relative proportions of constituent elements in all doped nanophosphors. Transmission electron microscopy (TEM) micrograph indicated the presence of agglomerated particles with the average size in the nano range. Photoluminescence excitation (PLE) spectra showed that the designated phosphors could be excited by near ultraviolet (NUV) energized lighting sources. The strongest emission centred at 576 nm, corresponding to electric dipole (4F9/2 → 6H13/2) transition of Dy(III) ion. Furthermore, characteristics photometric parameters viz. correlated color temperature (CCT), chromaticity coordinates (x and y), and color purity (%) were figure out with the aid of PL data, which strongly endorsed their usage in NUV energized WLEDs applications.
Joghee Nanjundan,Channappa Manjunatha,Jalli Radhamani,Ajay Kumar Thakur,Rashmi Yadav,Arun Kumar,Mohan Lal Meena,Rishi Kumar Tyagi,Devender Kumar Yadava,Dhiraj Singh 한국식물병리학회 2020 Plant Pathology Journal Vol.36 No.2
Powdery mildew of Indian mustard (Brassica juncea), caused by Erysiphe cruciferarum, is emerging as ma- jor problem in India. All the Indian mustard cultivars presently grown in India are highly susceptible to pow- dery mildew and so far no resistance source has been reported. In this study, with an aim to identify resistant source, 1,020 Indian mustard accessions were evaluated against E. cruciferarum PMN isolate, at Wellington, The Nilgiris, Tamil Nadu, India under natural hot spot conditions. The study identified one accession (RDV 29) with complete resistance against E. cruciferarum PMN isolate for the first time, which was consistent in five independent evaluations. Genetic analysis of F1, F2 and backcross populations obtained from the cross RSEJ 775 (highly susceptible) × RDV 29 (highly resistant) for two season revealed that the resistance is governed by two genes with semi-dominant and gene dosage effect. Further, a new disease rating system using six scales (0, 1, 2, 3, 4, and 5) has also been proposed in this study to score powdery mildew based on progress of fungal growth in different plant parts of the F2 population. The outcome of this study viz. newly identified powdery mildew-resistant Indian mustard accession (RDV 29), information on inheritance of resistance and the newly developed disease rating scale will provide the base for development of powdery mildew-resistant cultivars of Indian mustard.