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博, 松井; 佳代子, 網田; 源蔵, 橋詰; 吟也, 足立; 二朗, 塩川

doi:10.1246/nikkashi.1987.1833

NIPPON KAGAKU KAISHI

1987

DOI: 10.1246/nikkashi.1987.1833

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松井博¹,

網田佳代子²,

橋詰源蔵³

et al.

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1990

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“…We have carried out extensive investigations on the preparation conditions of well emitting CaS:Ce phosphors either from CaSO4 -2H20 or CaSO4" 1/2H20 (8)(9)(10)(11), or from CaSO3 -1/2H20 (12) containing cerium. We observed that Na in the starting materials does affect the shapes of the phosphor particles and that it does lead to high emission intensities.…”

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confidence: 99%

Effects of Incorporated Sodium on Photoluminescence and Particle Shapes of CaS : Ce Phosphors

Matsui

Hashizume

Okamoto

et al. 1990

J. Electrochem. Soc.

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Cerium containing calcium sulfite hemihydrate, CaSOj:Ce -1/2H20, of spherical particles was prepared as start material by precipitation using a reaction between ammonium (1 -x)-sodium (x) sulfite solution (x = 0-64 mole percent) containing a given concentration of cerium sulfate (III), and a calcium chloride solution. This CaSOj:Ce -1/2H30 was reduced to cerium-activated calcium sulfide (CaS:Ce) of spherical particles in a stream of hydrogen sulfide at 900~ The relationships between the sodium (Na) content in both the starting material, CaSOj:Ce-1/2H20, and the reduction product, CaS:Ce, and the intensity of photoluminescenee was investigated. A linear relationship between the intensity of photoluminescence and the Na content up to about 0.3-0.4 mole percent (Na/CaS:Ce), where the intensity has its maximum, was observed. With increasing Na content in the CaSOj:Ce 9 1/2H20, the surface morphology of the CaS:Ce shows sintering, and fine particles become larger and well grown.Calcium sulfide (CaS) phosphors prepared by a sulfurizing flux method using a mixture of a calcium compound containing activator, Na~CO3 as flux, and an excess amount of sulfur has been reported before (1). Also CaS

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mentioning

confidence: 99%

Effects of Incorporated Sodium on Photoluminescence and Particle Shapes of CaS : Ce Phosphors

Matsui

Hashizume

Okamoto

et al. 1990

J. Electrochem. Soc.

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Cited by 1 publication

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Effects of Incorporated Sodium on Photoluminescence and Particle Shapes of CaS : Ce Phosphors

Effects of Incorporated Sodium on Photoluminescence and Particle Shapes of CaS : Ce Phosphors

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