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Title: Preparation and characterisation of yttrium based luminescence phosphors
Authors: Sivakumar, V
Lakshmanan, Arunachalam
Kumar, R Satheesh
Kalpana, S
Rani, R Sangeetha
Jose, M T
Keywords: Lamp and Display Phosphors
Thermal quenching
Luminescence phosphors
Issue Date: Feb-2012
Publisher: NISCAIR-CSIR, India
Abstract: High sensitive Y<sub>2</sub>O<sub>3</sub>:Eu<sup>3+</sup>, Gd<sub>2</sub>O<sub>3</sub>:Eu<sup>3+</sup>, (Y<sub>x</sub>Gd<sub>1</sub><sub>-x</sub>)O<sub>3</sub>:Eu<sup>3+</sup>, YAG (Y<sub>3</sub>Al<sub>5</sub>O<sub>12</sub>):Eu<sup>3+</sup> and (Y<sub>x</sub>Gd<sub>1</sub><sub>-x</sub>)BO<sub>3</sub>:Eu<sup>3+</sup> luminescence display phosphors have been made by pyrolysis route followed by sintering at a relatively low temperature of 1000°C. The photoluminescent (PL) efficiencies of all the five phosphors under UV excitation are found to be comparable to that of commercial (Y<sub>x</sub>Gd<sub>1</sub><sub>-x</sub>)BO<sub>3</sub>:Eu<sup>3+</sup> (LG make). The PL efficiency as well as 395 nm (4f-4f) to 260 nm (charge transfer) excitation intensity ratio in Y<sub>2</sub>O<sub>3</sub>:Eu<sup>3+</sup> was found to vary in a complex way with Eu concentration. YAG:Eu<sup>3+</sup> could serve as a cheaper substitute to Y<sub>2</sub>O<sub>3</sub>:Eu<sup>3+</sup> red phosphor used currently in compact fluorescent lamps. While the PL efficiency of Y<sub>2</sub>O<sub>3</sub>:Eu<sup>3+</sup> remains fairly constant with excitation temperature in the region 25-250°C, the PL efficiency of (Y<sub>x</sub>Gd<sub>1</sub><sub>-x</sub>)BO<sub>3</sub>:Eu<sup>3+</sup> gets reduced by more than 30% when the excitation temperature increased from 25 to 250°C.
Description: 123-128
ISSN: 0975-1041 (Online); 0019-5596 (Print)
Appears in Collections:IJPAP Vol.50(02) [February 2012]

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