Microwave synthesis of lamp phosphors

Yi Fang, Dinesh Kumar Agrawal, James C. Walck, Joan M. Coveleskie, Robert T. McSweeney, Chung Nin Chau

Research output: Contribution to conferencePaper

Abstract

Various lamp phosphors are synthesized by a microwave processing technique in a multimode microwave furnace operating at 2.45 GHz. The phosphors include [Ca10(PO4)6(Cl,F):Sb:Mn], (Y,Eu) 2O3, BaMgAl10O17:Eu, and (La,Ce)PO4:Ce:Tb, with or without flux. The microwave-synthesized phosphors are comprehensively characterized for particle size, specific surface area, brightness, and luminescent properties. The properties of the microwave-synthesized phosphors are comparable to that of the conventional products. However, the kinetics of the phosphor synthesis is substantially enhanced in the microwave processing. Usually, the same reaction can be finished at a temperature 100 to 200°C lower than in the conventional process. Besides, the soaking time at the final temperature is reduced by up to 90% compared to a conventional process. In some cases, microwave processing also produces phosphors with special properties. For example, the thermal stability of the microwave synthesized (La,Ce)PO4:Ce:Tb is significantly better than conventional product. This study demonstrates many advantages of microwave processing over the traditional process in phosphor synthesis.

Original languageEnglish (US)
Number of pages1
StatePublished - Dec 1 2004
Event2004 AIChE Annual Meeting - Austin, TX, United States
Duration: Nov 7 2004Nov 12 2004

Other

Other2004 AIChE Annual Meeting
CountryUnited States
CityAustin, TX
Period11/7/0411/12/04

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Electric lamps
Phosphors
Microwaves
Processing
Specific surface area
Luminance
Furnaces
Thermodynamic stability
Particle size
Fluxes
Temperature
Kinetics

All Science Journal Classification (ASJC) codes

  • Engineering(all)

Cite this

Fang, Y., Agrawal, D. K., Walck, J. C., Coveleskie, J. M., McSweeney, R. T., & Chau, C. N. (2004). Microwave synthesis of lamp phosphors. Paper presented at 2004 AIChE Annual Meeting, Austin, TX, United States.
Fang, Yi ; Agrawal, Dinesh Kumar ; Walck, James C. ; Coveleskie, Joan M. ; McSweeney, Robert T. ; Chau, Chung Nin. / Microwave synthesis of lamp phosphors. Paper presented at 2004 AIChE Annual Meeting, Austin, TX, United States.1 p.
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Fang, Y, Agrawal, DK, Walck, JC, Coveleskie, JM, McSweeney, RT & Chau, CN 2004, 'Microwave synthesis of lamp phosphors', Paper presented at 2004 AIChE Annual Meeting, Austin, TX, United States, 11/7/04 - 11/12/04.

Microwave synthesis of lamp phosphors. / Fang, Yi; Agrawal, Dinesh Kumar; Walck, James C.; Coveleskie, Joan M.; McSweeney, Robert T.; Chau, Chung Nin.

2004. Paper presented at 2004 AIChE Annual Meeting, Austin, TX, United States.

Research output: Contribution to conferencePaper

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AU - Fang, Yi

AU - Agrawal, Dinesh Kumar

AU - Walck, James C.

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AU - Chau, Chung Nin

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N2 - Various lamp phosphors are synthesized by a microwave processing technique in a multimode microwave furnace operating at 2.45 GHz. The phosphors include [Ca10(PO4)6(Cl,F):Sb:Mn], (Y,Eu) 2O3, BaMgAl10O17:Eu, and (La,Ce)PO4:Ce:Tb, with or without flux. The microwave-synthesized phosphors are comprehensively characterized for particle size, specific surface area, brightness, and luminescent properties. The properties of the microwave-synthesized phosphors are comparable to that of the conventional products. However, the kinetics of the phosphor synthesis is substantially enhanced in the microwave processing. Usually, the same reaction can be finished at a temperature 100 to 200°C lower than in the conventional process. Besides, the soaking time at the final temperature is reduced by up to 90% compared to a conventional process. In some cases, microwave processing also produces phosphors with special properties. For example, the thermal stability of the microwave synthesized (La,Ce)PO4:Ce:Tb is significantly better than conventional product. This study demonstrates many advantages of microwave processing over the traditional process in phosphor synthesis.

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Fang Y, Agrawal DK, Walck JC, Coveleskie JM, McSweeney RT, Chau CN. Microwave synthesis of lamp phosphors. 2004. Paper presented at 2004 AIChE Annual Meeting, Austin, TX, United States.