Phosphor and flourescent display device

Details Phosphor and flourescent display device Phosphor and flourescent display device

2001-09-18

2004-07-13

Koslow, C. Melissa (Department: 1755)

Compositions

Inorganic luminescent compositions

Compositions containing halogen; e.g., halides and oxyhalides

Reexamination Certificate

active

06761836

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to a phosphor and a fluorescent display device; and, more particularly, to a yellow light emission phosphor, which does not include cadmium, usable in a fluorescent display device and a fluorescent display device including such a yellow light emission phosphor.
BACKGROUND OF THE INVENTION
In order to generate yellow to red color in a conventional fluorescent display device, phosphors containing Cd such as (Zn, Cd)S:Ag, Cl or the like have been used. However, present environmental restrictions require a phosphor capable of generating yellow light without using Cd and, therefore, materials such as La
2
O
2
S:Tb or the like have been used as a yellow light emission phosphor.
However, although such a phosphor has an excellent life span in high voltage range, but when it is mixed with a conducting material to be used in a fluorescent display device whose operating anode voltage is 100 V or lower, its life span isn't so good.
SUMMARY OF THE INVENTION
It is, therefore, an object of the present invention to provide a yellow light emission phosphor without including Cd, which can be used in a fluorescent display device whose operating anode voltage is 100 V or lower and has an excellent life span even when it is mixed with a conducting material.
In accordance with a preferred embodiment of the present invention, there is provided an La
2
O
2
S:Eu phosphor emitting yellow light, wherein Eu concentration of the La
2
O
2
S:Eu phosphor is in the range of about 0.001 mol % to about 0.1 mol %.
In accordance with another preferred embodiment of the present invention, there is provided a fluorescent display device comprising an La
2
O
2
S:Eu phosphor, wherein Eu concentration of the La
2
O
2
S:Eu phosphor is in the range of about 0.001 mol % to about 0.1 mol %.


REFERENCES:
patent: 3418247 (1968-12-01), Yocom
patent: RE29662 (1978-06-01), Yocom
patent: 4275333 (1981-06-01), Kagami et al.

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