Phosphor for electron beam excitation and color display device using the same
AssigneeDowa Mining Co., Ltd.
InventorsMasahiro Gotoh, Akira Nagatomi, Kenji Sakane, Shuji Yamashita
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Abstract
A phosphor, which has less reduction in emission efficiency and is capable of keeping high luminance even when density of an electron beam for exciting the phosphor increases, is provided. As raw materials, Ca3N2 (2N), AlN (3N), Si3N4 (3N), and Eu2O3 (3N) are prepared, and each of the raw materials is weighed so that a mole ratio of each element is, for example, (Ca+Eu):Al:Si=1:1:1, and mixed, then the mixture is held and fired at 1500° C. under the inert atmosphere for three hours, and thereafter ground to produce a phosphor having a composition formula of Ca0.985SiAlN3:Eu0.015
Claims9
A phosphor for electron beam excitation expressed by a composition formula of MmAaBbOoNn:Z (where an element M is one or more bivalent elements, an element A is one or more trivalent elements, an element B is one or more tetravalent elements, O is oxygen, N is nitrogen, an element Z is an activator, and where values of m=a=b=1, o≧0, and n=2/3m+a+4/3b−2/3o).
A method of exciting a phosphor to emit light by electron beam irradiation, comprising:
- providing a phosphor expressed by a composition formula of MmAaBbOoNn:Z, where an element M is one or more bivalent elements, an element A is one or more trivalent elements, an element B is one or more tetravalent elements, O is oxygen, N is nitrogen, and an element Z is an activator, and where values of m>0, a>0, b>0, o≧0, where values of m=a=b=1, and n=2/3m+a+4/3b−2/3o);
- and
- irradiating the phosphor with an electron beam.
Dependencies are inferred from the claim text.