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ISSN: 2333-9721

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匹配条件： “S. K. Omanwar” ，找到相关结果约514407条。
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Slow evaporation method and enhancement in photoluminescence properties of YPO$_4$ : Eu$^{3+}$ co-doped with Bi$_{3+}$ ions
K A KOPARKAR,S K OMANWAR
- , 2016,

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Synthesis and luminescence properties of novel NaSCN: xCe3+ phosphor
Devayani Chikte(Awade),S. K. Omanwar
- , 2019, DOI: https://doi.org/10.1080/21870764.2019.1641885

Abstract: ABSTRACT The blue-emitting novel phosphor NaSCN: xCe3+(x = 0.005,0.01,0.02) is reported here for the first time. The synthesis method is simple, time saving, and cost effective. X-ray power diffraction (XRD) analysis confirmed the formation of said phosphor, and SEM images were recorded for the surface morphology. Photoluminescence emission (PL) and excitation (PLE) measurements were also recorded. Variations in emission intensity with the Ce3+concentration were observed and recorded leading to determination of the critical concentration. The concentration quenching observed in this phosphor is due to mainly electric multipole interaction. The CIE1931 color co-ordinates and the critical distance were determined

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A Potential Candidate for Lamp Phosphor: Eu3+ Activated K2Y2B2O7
K. A. Koparkar,N. S. Bajaj,S. K. Omanwar
Advances in Optical Technologies , 2014, DOI: 10.1155/2014/706459

Abstract: The novel phosphor K2Y2B2O7 doped with europium is studied for its photoluminescence properties. The studies show that the phosphor gives strong red emission (PL) at 613？nm related to 5D0-7F2 transition of Eu3+ under the 260？nm excitation (PLE) related to the charge transfer (CT) from the 2p orbital of the O2？ ions to the 4f orbital of Eu3+ ions with CIE coordinates ( ; ). The results of PL and PLE spectra indicate the applicability of K2Y2B2O7:Eu as a red component in lamp phosphor. The phosphor is characterized through XRD pattern analysis, and morphology is explained on the basis of SEM image. Optimum concentration of Eu3+ required for the highest intensity of emission is also studied. 1. Introduction Borates as host for light emitting materials under UV excitation have attracted much attention. The reason behind their being in a focus of research is their variety of structure types, transparency to a wide range of wavelengths, and high optical quality [1–4]. Also borates possess excellent properties as host due to the inherent attributes of the large band gap and covalent bond energy. A variety of borate host materials doped with rare earth and other ions have been studied and reported [5]. Moreover, B–O bond generally has no absorption in near UV region and has absorption in deep UV region because of its large covalent bond energy. Some previous works show that Eu3+ doped borates exhibit relatively strong absorption in the UV region and intense red emission with good color purity [6, 7]. Recently the alkali earth metal (M) yttrium borates (M2Y2B2O7) have been well known hosts for luminescent material with better crystallinity, lower synthesis temperature, and higher radiation efficiency, as compared to the corresponding simple alkali earth metal borates [8]. The Na2Y2B2O7 is an excellent host for luminescent materials which supports all the possible trivalent rare earth dopants and shows intense emission from violet region to red region [9]. In the present work, we investigate, for the first time, the photoluminescence characteristics of Eu3+ doped K2Y2B2O7. The purpose of replacing the mostly studied Na+ by K+ is to find the ion type dependence of Eu3+ luminescence in M2Y2B2O7 host. The photoluminescence properties of the synthesized materials were studied using a fluorescence spectrometer (Hitachi F-7000). 2. Experimental 2.1. Sample Preparation The powder samples of the phosphor K2Y2B2O7 with different concentrations of Eu3+ (0.001, 0.002, 0.005, 0.01, and 0.02) have been prepared by solution combustion technique. The method is based on the

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Luminescence properties of terbium-doped Li$_3$PO$_4$ phosphor for radiation dosimetry
C B PALAN,N S BAJAJ,S K OMANWAR
- , 2016,

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Synthesis and photoluminescence study of narrow-band UVB-emitting LiSr$_4$(BO$_3$)$_3$:Gd$^{3+}$, Pr$^{3+}$ phosphor
A O CHAUHAN,N S BAJAJ,S K OMANWAR
- , 2017,

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Near-infrared spectral downshifting in Sr$_{(3a？？x)}$(VO$_4$)$_2$:${}_x$Nd$^{3+}$ phosphor
K A KOPARKAR,N S BAJAJ,N S SAWALA,S K OMANWAR
- , 2016,

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Combustion synthesis and preliminary luminescence studies of LiBaPO4 : Tb3+ phosphor
A Soni,C B Palan,M S Kulkarni,N S Bajaj,S K Omanwar
- , 2015,

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Synthesis and luminescence properties of Tb$^{3+}-doped LiMgPO$_4$ phosphor
A SONI,C B PALAN,N S BAJAJ,S K OMANWAR
- , 2016,

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Microwave-assisted synthesis and photoluminescence properties of ZnS:Pb$^{2+}$ nanophosphor for solid-state lighting
C B PALAN,D N GAME,N B INGALE,S K OMANWAR
- , 2017,

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Simultaneous Waste Water Purification via Photocatalysis and Seed Germination [PDF]
Sadhana A. Sawant, Ajinkya Nene, Savita P. Somani, Shreeniwas K. Omanwar, Prakash R. Somani
Green and Sustainable Chemistry (GSC) , 2013, DOI: 10.4236/gsc.2013.33015

Abstract: Preliminary results of our study related to simultaneous waste water purification by photocatalytic degradation of organic impurity (Methylene Blue dye) and its effects on seed germination are presented here. It is interesting and important to know that complete degradation of the dye occurs within 2 hours and does not adversely affect the seed germination process. It is concluded that waste water purification by photocatalysis and seed germination (agriculture) can be carried out simultaneously, opening a way for advanced agriculture.

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