Low-energy-electron-exciting fluorescent display device

Details Low-energy-electron-exciting fluorescent display device Low-energy-electron-exciting fluorescent display device

1981-01-15

1982-02-02

Cooper, Jack

Electric lamp and discharge devices

With luminescent solid or liquid material

Vacuum-type tube

2523014F, C09K 11465

Patent

active

043141773

ABSTRACT:
A red emission fluorescent display device employing improved SnO.sub.2 :Eu phosphor as a low-energy-electron excitation phosphor. The phosphor is manufactured by the following steps:
An aqueous solution of a mixture of europium and at least one material selected from stannous halides and stannous sulfate is prepared. The amount of europium ion is adjusted so that the ratio thereof to tin ions ranges between 5.times.10.sup.-2 and 10 atomic %. The solution is poured into and mixed with a hot aqueous solution including oxalic ions, while the mixed solution is being stirred, to form oxalate coprecipitates of tin and europium. After being dryed the coprecipitate is heated so as to be thermally decomposed and then is subjected to heat treatment at the temperature above that for the thermal decomposition, whereby europium ions are diffused into the stannic oxide matrix.
The device exhibits remarkably high luminescence intensity which is satisfactory for practical use.

REFERENCES:
Matsuoka et al., "J. Electrochem. Soc.," vol. 125, No. 1, pp. 102-106.

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