Photoluminescence and thermoluminescence studies of Mg2SiO4:Eu3+ nano phosphor

Prashantha, S.C.; Lakshminarasappa, B.N.; Nagabhushana, B.M.

doi:10.1016/j.jallcom.2011.03.148

Cited by 119 publications

(33 citation statements)

References 33 publications

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“…The sharp intense diffraction peaks appearing at 2h of 31.75°, 34.40°, 36.26°, 47.53°, 56.61°, 62.90°, 67.95°and 69.06°corre-spond with those from (100), (002), (101), (102), (110), (103), (200), (112), and (201) orientations, respectively. The crystallite size (D) was found to be *28 nm and was estimated from the line broadening in PXRD using DebyeScherrer's formula (Prashantha et al 2011)…”

Section: Resultsmentioning

confidence: 99%

Biogenic synthesis of zinc oxide nanoparticles using Ruta graveolens (L.) and their antibacterial and antioxidant activities

et al. 2015

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In the present investigation, green synthesis of zinc oxide nanoparticles were successfully synthesized by biological method using aqueous stem extract of Ruta graveolens act as reducing agent. Formation of ZnO nanoparticles were characterized by powder X-ray diffraction (PXRD), UV-visible spectroscopy, scanning electron microscopy (SEM) and transmission electron microscopy (TEM) techniques. Zinc oxide nanoparticles were subjected to biological properties such as antibacterial and antioxidant studies. The PXRD pattern reveals that ZnO sample belongs to hexagonal phase with Wurtzite structure. The UV-vis absorption spectrum shows an absorption band at 355 nm due to ZnO nanoparticles. SEM images show that the particles have spherical like structure with large surface area and the average crystallite sizes were found to be in the range *28 nm. These observations were confirmed by TEM analysis. The ZnO nanoparticles are found to inhibit the antioxidant activity of 1,1-diphenyl-2-picrylhydrazyl free radicals effectively. ZnO Nps exhibit significant bactericidal activity against Gram -ve bacterial strains such as Klebsiella aerogenes, Pseudomonas aeruginosa, Escherichia coli and Gram ?ve Staphylococcus aureus by agar well diffusion method.

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Section: Resultsmentioning

confidence: 99%

Biogenic synthesis of zinc oxide nanoparticles using Ruta graveolens (L.) and their antibacterial and antioxidant activities

et al. 2015

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“…When RE 3þ cations doped into the host, they could probably occupy both sites. Based on this, Eu 3 þ is chosen to study luminescent properties of the material [4,40,41]. Fig.…”

Section: Resultsmentioning

confidence: 99%

“…The peak around 220 1C might be due to recombination of charges released from F þ centers near Mg 2 þ /Eu 3 þ sites [42] and peak around 370 1C may tentatively attributed to recombination of F center electrons with holes associated with SiO 4 and Mg 2 þ sites. TL glow curves were analyzed by computerized glow curve deconvolution based on Gaussian function using Origin 8.1 software as discussed elsewhere [41,43,44] and shown in Fig. 6 for a fluence of 5 Â 10 11 ions cm À 2 .…”

Section: Resultsmentioning

confidence: 99%

100MeV Si8+ ion induced luminescence and thermoluminescence of nanocrystalline Mg2SiO4:Eu3+

Prashantha¹,

Lakshminarasappa²,

Singh³

2012

Journal of Luminescence

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a b s t r a c tNanoparticles of Mg 2 SiO 4 :Eu 3 þ have been prepared by the solution combustion technique and the grain size estimated by PXRD is found to be in the range 40-50 nm. Ionoluminescence (IL) studies of Mg 2 SiO 4 :Eu 3 þ pellets bombarded with 100 MeV Si 8 þ ions with fluences in the range 1.124-22.48 Â 10 12 ions cm À 2 are carried out at IUAC, New Delhi, India. Five prominent IL bands with peaks at 580 nm, 590 nm, 612 nm, 655 nm and 705 nm are recorded. These characteristic emissions are attributed to the luminescence centers activated by Eu 3 þ cations. It is found that IL intensity decreases rapidly in the beginning. Later on, the intensity decreases slowly with further increase of ion fluence. The reduction in the ionoluminescence intensity with increase of ion fluence might be attributed to degradation of Si-O (n 3 ) and Si-O (2n 3 ) bonds present on the surface of the sample. The red emission with peak at 612 nm is due to characteristic emission of 5 D 0 -7 F 2 of the Eu 3 þ cations. Thermoluminescence (TL) studies of Mg 2 SiO 4 :Eu 3 þ pellets bombarded with 100 MeV Si 8 þ cations with fluences in the range 5 Â 10 11 ions cm À 2 to 5 Â 10 13 ions cm À 2 are made at RT. Two prominent and well resolved TL glows with peaks at $ 220 1C and $ 370 1C are observed. It is observed that TL intensity increases with increase of ion fluence. This might be due to creation of new traps during swift heavy ion irradiation.

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“…There have been extensive studies on new phosphors for W-LEDs [3][4][5][6][7][8][9][10]. In particular Eu 3+ -doped oxyacid materials such as tungstates [11], silicates [14], vanadates [15], borates [16] and phosphates [11][12][13][14][15][16][17] have been investigated for red emitting phosphors.…”

Section: Introductionmentioning

confidence: 99%

The thermal stability and structural site-distribution of Eu3+ ions in the red-emitting phosphors Ca9Eu2W4O24 and Sr9Eu2W4O24

Qin

Huang

Seo

2012

Journal of Alloys and Compounds

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Photoluminescence and thermoluminescence studies of Mg2SiO4:Eu3+ nano phosphor

Cited by 119 publications

References 33 publications

Biogenic synthesis of zinc oxide nanoparticles using Ruta graveolens (L.) and their antibacterial and antioxidant activities

Biogenic synthesis of zinc oxide nanoparticles using Ruta graveolens (L.) and their antibacterial and antioxidant activities

100MeV Si8+ ion induced luminescence and thermoluminescence of nanocrystalline Mg2SiO4:Eu3+

The thermal stability and structural site-distribution of Eu3+ ions in the red-emitting phosphors Ca9Eu2W4O24 and Sr9Eu2W4O24

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