Studies of defects inYVO(4): Pb2+, Eu3+ red phosphor material
DSpace at IIT Bombay
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Title |
Studies of defects inYVO(4): Pb2+, Eu3+ red phosphor material
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Creator |
NIRWAN, FM
RAO, TKG GUPTA, PK PODE, RB |
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Subject |
combustion process
particle-size luminescence vanadates oxides garnet yvo4 |
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Description |
Doubly doped YVO4:Ph2+, Eu3+ red phosphor materials with fixed Eu3+ concentration (5 mol%) and varying Pb2+ concentration were prepared via a self-propagating (combustion) synthesis. This consisted of bringing a saturated aqueous solution of the desired metal salts and a suitable organic fuel to the boil, until the mixture ignited and a self-sustaining and rather fast combustion reaction initiated, resulting in dry, amorphous or usually crystalline fine particles of the desired material. The formation of crystalline vanadates was confirmed by X-ray diffraction. A strong emission line at 619 nm due to the (5) D-0 --> F-7(2) transition in the red region was observed. Defects, created by gamma radiation, were studied by means of photoluminescence, thermally stimulated luminescence (TSL) and electron spin resonance. Photoluminescence studies display considerable reduction in emission intensity which appears to arise due to the formation of defect centres after irradiation. The defect centres formed in the present system are tentatively assigned to F+ centres and step annealing measurements suggest a connection between these centres and the TSL glow peak.
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Publisher |
WILEY-V C H VERLAG GMBH
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Date |
2011-09-01T20:38:02Z
2011-12-26T12:59:47Z 2011-12-27T05:52:39Z 2011-09-01T20:38:02Z 2011-12-26T12:59:47Z 2011-12-27T05:52:39Z 2003 |
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Type |
Article
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Identifier |
PHYSICA STATUS SOLIDI A-APPLIED RESEARCH, 198(2), 447-456
0031-8965 http://dx.doi.org/10.1002/pssa.200306632 http://dspace.library.iitb.ac.in/xmlui/handle/10054/12862 http://hdl.handle.net/10054/12862 |
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Language |
en
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