Eradication-of-oxygen-contamination-in-production-of-ZnSAgCl-blue-phosphor-powder_2006.pdf

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Eradication-of-oxygen-contamination-in-production-of-ZnSAgCl-blue-phosphor-powder_2006.pdf

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Eradication-of-oxygen-contamination-in-production-of-ZnSAgCl-blue-phosphor-powder_2006

Materials Chemistry and Physics 96 (2006) 511–516 Eradication of oxygen contamination in production of ZnS:Ag:Cl blue phosphor powder Lyuji Ozawa a , Mika Makimura b , Minoru Itoh c,? a L.L. Technology, 8 Old Grange Road, Hopewell Junction, NY 12533, USA b Industrial Research Institute of Nagano Prefecture, 1-18-1 Wakasato, Nagano 380-0928, Japan c Department of Electrical and Electronic Engineering, Faculty of Engineering, Shinshu University, 4-17-1 Wakasato, Nagano 380-8553, Japan Received 18 May 2005; received in revised form 21 July 2005; accepted 24 August 2005 Abstract It has been pointed out that oxygen contamination of ZnS:Ag:Cl blue phosphor powder mainly comes from the air trapped in inevitably existing pores in heating mixture in crucible. Calculated amount of the trapped air is 2× 10?3 mol per mole a-ZnS in crucible. It is found that addition of AlCl3 (2× 10?3 mole) eradicates the oxygen gas in heating mixture, by means of formation of Al2O3 solid. Segregating Na2S4 carries the fine Al2O3 particles to the place that Al2O3 converts to Al2S3 by the concentrated Na2S4. The segregation of Na2S4 requires a slow cooling from 950 to 8 p ? K 1 c r e e o h a i C g l a t p t m b 0 d50 ? C. The segregation produces the large yellowish particles (50 m), which are confirmed as ZnO microcrystals surprisingly. Then, we have roposed a model of the growth of ZnO microcrystals in heated mixture which is a sulfur-rich atmosphere. 2005 Elsevier B.V. All rights reserved. eywords: Oxygen contamination; ZnS:Ag:Cl blue phosphor powder; Crystal growth . Introduction ZnS:Ag:Cl is widely used as blue primary phosphor of athodoluminescence (CL) display devices, such as cathode ay tube (CRT), vacuum fluorescent display (VFD), and field mission display (FED) [1,2]. Although the energy conversion fficiency of the commercial ZnS:Ag:Cl phosphors has been ptimized by the producers [3], the phosphor producers still ave difficulty in controlling a small variation in CL intensity nd color