Phosphor and display device or light source using the same
AssigneeHitachi, Ltd.
InventorsMasatoshi Shiiki, Choichiro Okazaki, Teruki Suzuki
Life of this patent
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Abstract
A phosphor emitting a visible light under an exciting light composed mainly of ultraviolet light of 100 nm to 400 nm, which is represented by the following composition formula: (Ba1-a-b-cCaaSrbMc)O.xMgO.yAl2O3 wherein M is at least one element selected from Eu, Tm, Lu and Mn, and a, b, c, x and y satisfy the following conditions: 0<a≦0.01, 0<b≦0.01, 0.01≦c≦0.3, 0≦x≦2.2, and 0≦y≦12.0; and a display device and a light source using said phosphor.
Claims17
A phosphor emitting a visible light under an exciting light composed mainly of ultraviolet light of 100 nm to 400 nm, which is represented by the following composition formula:
- (Ba1-a-b-cCaaSrbMc)O.xMgO.yAl2O3
- where M is at least one element selected from Eu, Tm, Lu and Mn, and a, b, c, x and y satisfy the following conditions:
- 0<a≦0.01,
- 0<b≦0.01,
- 0.01≦c≦0.3,
- 0≦x≦2.2, and
- 0≦y≦12.0.
A display device comprising at least a plasma-discharging display panel, wherein the phosphor layer emitting blue-colored or green-colored light among the red-, green- and blue-colored light emitting phosphor layers of said display panel is constituted of the following phosphor:
- a phosphor emitting a visible light under an exciting light composed mainly of an ultraviolet light of 100 nm to 400 nm, which is represented by the following composition formula:
- (Ba1-a-b-cCaaSrbMc)O.xMgO.yAl2O3
- wherein M is at least one element selected from Eu, Tm, Lu and Mn and a, b, c, x and y satisfy the following conditions:
- 0<a≦0.01,
- 0<b≦0.01,
- 0.01≦c≦0.3,
- 0≦x≦2.2, and
- 4.0≦y≦12.0.
A display device having at least a plasma-discharging display panel, wherein the thermal emission spectrum of the phosphor layer emitting a blue-colored light among the phosphor layers of said display panel emitting red-, green- and blue-colored lights has a ratio of the signal intensity in the high temperature range of 300K to 600K to the signal intensity in the low temperature range of 100K to 300K of 1 or less.
A light source comprising at least a fluorescent lamp in which a gas emitting an ultraviolet light including a wavelength of 400 nm or less upon discharge is sealed in a glass-made container and a driver circuit for driving said fluorescent lamp, wherein the phosphor layer of said fluorescent lamp is constituted of the following phosphor:
- a phosphor emitting a visible light under an exciting light composed mainly of an ultraviolet light of 100 nm to 400 nm and represented by the following composition formula:
- (Ba1-a-b-cCaaSrbMc)O.xMgO.yAl2O3
- wherein M is at least one element selected from Eu, Tm, Lu and Mn and a, b, c, x and y satisfy the following conditions:
- 0<a≦0.01,
- 0<b≦0.01,
- 0.01≦c≦0.3,
- 0≦x≦2.2, and
- 4.0≦y≦12.0.
Dependencies are inferred from the claim text.