Phosphor and display device or light source using the same
AssigneeHitachi, Ltd.
InventorsMasatoshi Shiiki, Choichiro Okazaki, Teruki Suzuki
Life of this patent
Estimating the term…
Abstract
A phosphor having the following 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; emits visible light under excitation by ultraviolet light of 100 nm to 400 nm. The phosphor is useful in display devices and light sources.
Claims20
A phosphor emitting a visible light under excitation by ultraviolet light of 100 nm to 400 nm, having the following 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.
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 comprises the following phosphor:
- a phosphor emitting a visible light under excitation by ultraviolet light of 100 nm to 400 nm, having the following 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-discharge 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 container and a driver circuit for driving said fluorescent lamp, wherein the phosphor layer of said fluorescent lamp is comprised of the following phosphor:
- a phosphor emitting visible light under excitation by ultraviolet light of 100 nm to 400 nm and having the following 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.