Compositions – Inorganic luminescent compositions – Compositions containing halogen; e.g. – halides and oxyhalides
Reexamination Certificate
2003-05-28
2004-10-19
Koslow, C. Melissa (Department: 1755)
Compositions
Inorganic luminescent compositions
Compositions containing halogen; e.g., halides and oxyhalides
C313S582000, C313S584000, C313S643000, C313S486000
Reexamination Certificate
active
06805814
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a phosphor that is suitable for a light-emitting element excited by vacuum ultraviolet-ray, such as a plasma display panel (hereinafter, referred to as “PDP”) and a rare gas lamp, and also relates to a light-emitting element excited by vacuum ultraviolet-ray comprising the phosphor.
BACKGROUND OF THE INVENTION
A phosphor has been used for elements excited by vacuum ultraviolet-ray such as PDP's and rare gas lamps, and the phosphor which is excited by vacuum ultraviolet rays to emit light has already been known. For example, the following phosphors have been practically used: aluminate phosphors, such as BaMgAl
10
O
17
: Eu for use as a blue phosphor and BaAl
12
O
19
: Mn for use as a green phosphor (JP10-1666A); silicate phosphors, such as CaMgSi
2
O
6
: Eu for use as a blue phosphor and Zn
2
SiO
4
: Mn for use as a green phosphor; and borate phosphors, such as (Y, Gd) BO
3
: Eu for use as a red phosphor, and these materials have been used for light emitting element excited by vacuum ultraviolet-ray such as PDP's and rare gas lamps.
Light emitting element emit visible light radiated from phosphor which is irradiated and excited by vacuum ultraviolet-ray radiated from the plasma, which is generated during the discharge of the light emitting element in a rare gas. Consequently, the phosphor is exposed by plasma to cause a reduction in the brightness of the phosphor after plasma exposure.
SUMMARY OF THE INVENTION
The objective of the present invention is to provide a phosphor for use in a light emitting element excited by vacuum ultraviolet-ray that has high brightness even after plasma exposure.
Under such circumstances, the inventors of the present invention have extensively studied in order to solve the above-mentioned problems, and found that, among aluminate phosphors containing Mn as an activating agent and gallium acid salt phosphors containing Mn as an activating agent, a phosphor obtained from an aluminate or a gallium acid salt having a specific composition has high brightness after plasma exposure, and is effectively used as a phosphor for use in a light emitting element excited by vacuum ultraviolet-ray, in particular, as a green light-emitting phosphor, and then, completed the present invention.
That is, the present invention provides a phosphor comprising a compound represented by a formula M
1
1−a
M
2
11−b
Mn
a+b
O
18−(a+b)/2
(wherein, M
1
represents at least one of materials selected from the group consisting of La, Y and Gd, and M
2
represents at least one of materials selected from the group consisting of Al and Ga, a represents an number in a range from not less than 0 to less than 1, b represents a number in a range from not less than 0 to less than 1, and sum of a and b is greater than 0).
Moreover, the present invention also provides a light emitting element excited by vacuum ultraviolet-ray comprising the above-mentioned phosphor.
REFERENCES:
patent: 4644223 (1987-02-01), de Hair et al.
patent: 6045721 (2000-04-01), Zachau et al.
patent: 1 073 089 (2001-01-01), None
patent: 5-86366 (1993-04-01), None
patent: 10-1666 (1998-01-01), None
patent: 2002-121550 (2002-04-01), None
patent: WO 99/34389 (1999-07-01), None
T. Hisamune et al., “Development of Mn2+Activated Ba-Sr-Mg-aluminate Green Phosphors for PDPs”, J. Illum. Engng. Inst. Japan, vol. 83, No. 5, (1999), pp. 306-313 with Abstract.
S.V. Bulyarskii et al., “Emission from Mn4+Ions in Gadolinium Gallium Garnet at High Laser Pumping Intensities”, Technical Physics Letters, vol. 28, No. 6, (2002), 475-478.
Phosphor Handbook, Ohmsya Ltd., 1987, pp. 104-105, 226-227 and 332-333, with English translation.
Ezuhara Takayoshi
Isobe Toshinori
Miyazaki Susumu
Koslow C. Melissa
Sughrue & Mion, PLLC
Sumitomo Chemical Company Limited
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