Image-didplay device
AssigneeHitachi, Ltd.
InventorsMasaaki Komatsu, Masatoshi Shiiiki, Shin Imamura
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Abstract
The present invention provides an image-display device using a phosphor which can improve a luminescence efficiency and characteristics of color coordinates by adding a IIA element to a host crystal of a ZnS phosphor to make a compound crystal. It is possible to provide an image-display device which can realize improvement in luminescence efficiency and color coordinate characteristics which has not been solved in the prior art, by using a phosphor expressed by Zn(1−x)MIIAxS:MIB,MIII where MIIA is one or more ITA elements in an element periodic table; MIB is one or more IB elements; and MIII is one or more MITIA elements (Sc, Y) and MITIB elements (Al, Ga, In).
Claims9
An image-display device having a faceplate formed with a phosphor layer, and means irradiating an electron beam to said phosphor layer, comprising:
- said phosphor layer consisting of a ZnS phosphor which is expressed by a general formula:
- Zn (1−x)MIIAxS:MIB,MIII
- where
- MIIA is at least one IIA element selected from the group of Be, Mg, Ca, Sr and Ba;
- MIB is at least one IB element selected from the group of Cu, Ag and Au;
- MIII is a iii element including at least one of Al and Ga;
- and
- a solubility x is 0<x<0.25.
An image-display device having a faceplate formed with a phosphor layer, and means irradiating an electron beam to said phosphor layer, comprising:
- said phosphor layer consisting of a ZnS phosphor which is expressed by a general formula:
- Zn(1−x)MxS:Cu,Al
- where
- M is at least one element selected from the group of Mg, Ca and Sr;
- and
- a solubility x is 0<x<0.07.
An image-display device having a faceplate formed with a phosphor layer, and means irradiating an electron beam to said phosphor layer, comprising:
- said phosphor layer consisting of a ZnS phosphor which is expressed by a general formula:
- Zn(1−x)MxS:Cu,Al
- where
- M is at least one element selected from the group of Mg, Ca and Sr;
- and
- a solubility x having a good linearity γ is 0<x<0.07.
An image-display device having a faceplate formed with a phosphor layer, and means irradiating an electron beam to said phosphor layer, comprising:
- said phosphor layer consisting of a ZnS phosphor which is expressed by a general formula:
- Zn(1−x)MxS:Ag,Al
- where
- M is at least one element selected from the group of Mg, Ca and Sr;
- and
- a solubility x is 0<x<0.20.
Dependencies are inferred from the claim text.