Preparation of CaS:TmF3 Phosphor

Journal of Inorganic Materials

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Preparation of CaS:TmF₃ Phosphor

SUN Jia-Ming; ZHONG Guo-Zhu; FAN Xi-Wu; ZHENG Chen-Wei; Gerd．O．Mueller⁺; ReginaMuller－Mach⁺

Changchun Institute of Physics, Chinese Academy of Sciences ,Laboratory of Excited States, Chinese Academy of Sciences Changchun 130021 China;
⁺Hewlett Packard Laboratory, Electroluminescent Technology Department, 49001 Lakeview Bowlevard Fremont, CA 94538 USA

Received:1997-05-12 Revised:1997-07-09 Published:1998-06-20 Online:1998-06-20

Abstract

Abstract: This paper studied the preparation of CaS powders by sulfurizing CaCO₃ in different atmosphere such as S+N₂, S+air, H₂S+H₂, H₂S, S+H₂S and S+H₂S+H₂ with different
reactive methods. The formation of impurity phases such as CaSO₄ and CaO depends strongly on the sulfurizing atmospheres. The amount of F^+ vacancies and the influence of F⁺
vacancies on the blue luminescence of CaS:TmF₃ phosphor were studied by photoluminescent (PL) and photoluminescent excitation spectra (PLE). It is concluded that CaS powders
containing large amount of F⁺ vacancies are not suitable for preparation of efficient CaS:TmF₃ phosphor because of the energy transfer from host and Tm³⁺ luminescent centers to the F⁺
vacancies. The qualified CaS powder for CaS:TmF₃ phosphor was prepared by sulfurizing CaCO₃ in S+H₂S atmosphere.

Key words: calcium sulfied, X-ray diffraction, F⁺ center, photoluminescence

CLC Number:

TF123

SUN Jia-Ming,ZHONG Guo-Zhu,FAN Xi-Wu,ZHENG Chen-Wei,Gerd．O．Mueller,ReginaMuller－Mach. Preparation of CaS:TmF₃ Phosphor[J]. Journal of Inorganic Materials.

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Preparation of CaS:TmF₃ Phosphor

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