Compositions – Inorganic luminescent compositions – Compositions containing halogen; e.g. – halides and oxyhalides
Reexamination Certificate
2002-06-19
2004-06-01
Koslow, C. Melissa (Department: 1755)
Compositions
Inorganic luminescent compositions
Compositions containing halogen; e.g., halides and oxyhalides
C252S30140S, C252S30140F, C252S30140H, C252S30140P, C252S301500, C252S30160R, C252S30160S, C313S582000, C313S584000, C313S467000, C313S497000, C313S503000, C313S463000
Reexamination Certificate
active
06743378
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a plasma display panel, and more particularly to an improvement in composition of mixed green-color fluorescent materials for a plasma display panel.
2. Description of the Related Art
In color plasma display panels, it has been known to a person skilled in the art that plural kinds of green-color fluorescent materials are mixed to adjust a chromaticity of green color.
Japanese laid-open patent publication No. 2001-135239 discloses that Zn
2
SiO
4
:Mn fluorescent material and a terbium (Tb) rare earth oxide fluorescent material are mixed to adjust the chromaticity of green color.
FIG. 1
is a chromaticity coordinate of Zn
2
SiO
4
:Mn fluorescent material, YBO
3
:Tb fluorescent material, and LaPO
4
:Tb fluorescent material. This conventional technique uses the Zn
2
SiO
4
:Mn fluorescent material which is, however, disadvantageous because the Zn
2
SiO
4
:Mn fluorescent material may increase the driving voltage for the plasma display panel. The Zn
2
SiO
4
:Mn fluorescent material is further disadvantageous in fast deterioration in luminance. For those reasons, it is preferable to avoid the use of Zn
2
SiO
4
:Mn fluorescent material as the green color fluorescent material.
In the above circumstances, the development of a novel composition of a mixed green color fluorescent material for adjusting a green color chromaticity in connection with a plasma display panel free from the above problems is desirable.
SUMMARY OF THE INVENTION
Accordingly, it is an object of the present invention to provide a novel composition of a mixed green color fluorescent material for adjusting a green color chromaticity in connection with a plasma display panel free from the above problems.
It is a further object of the present invention to provide a novel composition of a mixed green color fluorescent material for adjusting a green color chromaticity in connection with a plasma display panel, wherein the mixed green color fluorescent material is free of Zn
2
SiO
4
:Mn fluorescent material.
It is a still further object of the present invention to provide a novel composition of a mixed green color fluorescent material for adjusting a green color chromaticity in connection with a plasma display panel, wherein the mixed green color fluorescent material does not cause any substantive increase of the driving voltage for the plasma display panel.
It is yet a further object of the present invention to provide a novel composition of a mixed green color fluorescent material for adjusting a green color chromaticity in connection with a plasma display panel, wherein the mixed green color fluorescent material does not cause any deterioration of luminance of the plasma display panel.
The present invention provides a mixed green color fluorescent material for an electric device such as a plasma display panel. The mixed green color fluorescent material includes: at least a first fluorescent material selected from a Group A defined in a range (0.10≦x≦0.18, 0.70 ≦y≦0.80) on a chromaticity coordinate; and at least a second fluorescent material selected from a Group B defined in a range (0.25≦x≦0.35, 0.55 ≦y≦0.65) on the chromaticity coordinate.
The above and other objects, features and advantages of the present invention will be apparent from the following descriptions.
REFERENCES:
patent: 2001-84911 (2001-03-01), None
patent: 2001-135239 (2001-05-01), None
Koslow C. Melissa
NEC Corporation
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