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Synthesizing Phosphors Through Microwave Process

Published online by Cambridge University Press:  26 February 2011

Chris Y. Fang ,
Dinesh K. Agrawal ,
Ming Fu ,
Joan M. Coveleskie ,
Chung-nin Chau ,
James Walck  and
Rustum Roy
Chris Y. Fang
Affiliation:
yxf101@psu.edu, The Pennsylvania State University, Materials Research Institute, 133 MRL Building, University Park, PA, 16802, United States
Dinesh K. Agrawal
Affiliation:
dxa4@psu.edu, The Pennsylvania State University, Materials Research Institute, University Park, PA, 16802, United States
Ming Fu
Affiliation:
muf14@psu.edu, The Pennsylvania State University, Materials Research Institute, University Park, PA, 16802, United States
Joan M. Coveleskie
Affiliation:
Joan.Coveleskie@sylvania.com, OSRAM SYLVANIA, Inc., Hawes Street, Towanda, PA, 18848, United States
Chung-nin Chau
Affiliation:
Chung.Chau@SYLVANIA.com, OSRAM SYLVANIA, Inc., Hawes Street, Towanda, PA, 18848, United States
James Walck
Affiliation:
James.Walck@sylvania.com, OSRAM SYLVANIA, Inc., Hawes Street, Towanda, PA, 18848, United States
Rustum Roy
Affiliation:
rroy@psu.edu, The Pennsylvania State University, Materials Research Institute, University Park, PA, 16802, United States
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Abstract

Various Lamp phosphors, including [Ca10(PO4)6(Cl,F):Sb:Mn], (Y,Eu)2O3 (YOE), BaMgAl10O17:Eu (BAM), and (La,Ce)PO4:Ce:Tb (LAP), with or without flux, have been synthesized by a microwave processing technique in a multimode microwave furnace operating at 2.45 GHz. The microwave-synthesized phosphors were comprehensively characterized for particle size, specific surface area, brightness, and luminescence. Although most properties of the microwave-synthesized phosphors were comparable to that of the conventional products, the kinetics of the phosphor synthesis was substantially enhanced in the microwave processing. As a result, the soaking time at the final temperature was reduced by up to 90% compared to a conventional process. In addition, the required synthesis temperature was also lowered by 100-200°C in microwave process, compared to the conventional process for these lamp phosphors. Certain improved property was also observed in some microwave synthesized samples. The mechanism and advantages of microwave process for the lamp phosphor synthesis through solid-state reaction are addressed.

Keywords

microwave heatingpowder processingceramic
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 988: Symposium QQ – Solid-State Chemistry of Inorganic Materials VI , 2006 , 0988-QQ06-20
Copyright
Copyright © Materials Research Society 2007

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