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Luminescence properties of Eu3+, Bi3+ coactivated CaLaNbWO8 red phosphors under near UV and blue excitations

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dc.contributor.author Mariyam Thomas
dc.contributor.author Prabhakar Rao, P
dc.contributor.author Mahesh, S P K
dc.contributor.author Kumari, L S
dc.contributor.author Peter Koshy
dc.date.accessioned 2013-11-19T04:57:50Z
dc.date.available 2013-11-19T04:57:50Z
dc.date.issued 2011
dc.identifier.citation Physica Status Solidi A- Applications and Materials Science 208(9):2170-2175;Sep 2011 en_US
dc.identifier.issn 1862-6300
dc.identifier.uri http://ir.niist.res.in:8080/jspui/handle/123456789/760
dc.description.abstract Scheelite type red phosphors CaLa1-xNbWO8:xEu(3+) (x = 0.01, 0.03, 0.05, 0.1, 0.15, 0.2, and 0.25) and CaLa0.8-yNbWO8: 0.2Eu(3+), yBi(3+) (y = 0.1, 0.15, and 0.2) were prepared by conventional solid state reaction route. The crystalline structure, morphology and absorbance of these phosphors were characterized by powder X-ray diffraction (XRD), scanning electron microscope (SEM), Fourier transform infrared (FTIR), and UV Visible absorption spectroscopy. Investigations on their photoluminescent properties indicated that both Eu3+ doped and Eu3+, Bi3+ coactivated samples emit strong red light at 615 nm under both near UV (394 nm) and blue (465 nm) excitations. Bi3+ codoped system showed broadened charge transfer band (CTB) and stronger excitation peaks at 394 and 465 nm. The red emission intensity of CaLa0.8NbWO8:0.2Eu(3+) phosphor is improved by a factor of 2 as 20 mol% Bi3+ is introduced into the system, and is four times stronger than that of the commercial Y2O3:Eu3+ red phosphor. These phosphors are characterized by sharp red emission with color coordinates closer to the standard red phosphors. Thus, the above phosphors could be a promising red candidate for the phosphor converted white light emitting diodes (pc-WLEDs). en_US
dc.language.iso en en_US
dc.publisher Wiley en_US
dc.subject Luminescence en_US
dc.subject Phosphors en_US
dc.subject Tungstates en_US
dc.subject White LEDs en_US
dc.subject Charge compensation en_US
dc.subject Photoluminescence en_US
dc.title Luminescence properties of Eu3+, Bi3+ coactivated CaLaNbWO8 red phosphors under near UV and blue excitations en_US
dc.type Article en_US


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