Low-voltage excited white phosphor

Details Low-voltage excited white phosphor Low-voltage excited white phosphor

1999-10-07

2001-03-13

Koslow, C. Melissa (Department: 1755)

Compositions

Inorganic luminescent compositions

Zinc or cadmium containing

Reexamination Certificate

active

06200496

ABSTRACT:

CROSS REFERENCE TO RELATED APPLICATION
This application is based on application No. 99-16813 filed in the Korea Industrial Property Office on May 11, 1999, the content of which is incorporated hirein by reference.
FIELD OF THE INVENTION
The present invention relates to a low-voltage excited white phosphor, and more particularly, to a low-voltage excited white phosphor with high brightness and excellent color maintenance.
BACKGROUND OF THE INVENTION
Low-voltage driven display devices utilizing a voltage of IkV or less to excite phosphor material include FEDs (field emission displays), VFDs (vacuum fluorescent displays), etc. FEDs utilize well-established cathode-anode-phosphor technology in combination with dot matrix cellular construction of each pixel. VFDs also utilize cathode-anode-phosphor technology; electrons are emitted from a filament, and controlled by a grid electrode and an anode electrode to collide with phosphor material on the anode to excite the phosphor material. Generally, a CRT (cathode ray tube) produces various color images by mixing red, green and blue lights emitted from red, green and blue phosphors, respectively. It is difficult for VFDs or FEDs to radiate various colors by mixing red, green and blue lights because VFDs and FEDs generally only use one color phosphor. To obtain a white color in a VFD or FED, a red filter is generally mounted on a green phosphor. The white ray obtained by such a method does not have enough brightness and its color is not clear. The requirement of an additional filter also results in an increase in the production cost. Thus, with the ever-increasing demand for various color phosphors, there is a need to develop a white phosphor self-emitting a white ray.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide a low-voltage excited white phosphor having good color purity.
It is another object of the present invention to provide a low-voltage excited white phosphor with high brightness and excellent color maintenance.
It is yet another object of the present invention to provide a low-voltage excited white phosphor which emits white colored rays without using an additional filter.
In order to achieve these and other objects, the present invention provides a low-voltage excited white phosphor including a ZnS:Zn phosphor; and a (Zn
n
Cd
1−n
)S:Ag,Cl phosphor (n=0.5 to 0.7).


REFERENCES:
patent: 3031416 (1962-04-01), Morrison et al.
patent: 3922233 (1975-11-01), Torii et al.

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