| 摘要 |
PROBLEM TO BE SOLVED: To realize a long service life for display devices and light emission devices. SOLUTION: In these display devices and light emission devices, a blue color phosphor (bivalent europium activated alkaline earth silicate phosphor) having high performance is used in a state of being excited by ultraviolet rays in a vacuum ultraviolet region or low velocity electron beams. The material has the following composition formula: (Ae)3-x(Ae')Si2O8:Eux (Here, Ae or Ae' is composed of at least a kind of an alkaline earth metal, and Ae is chosen from Sr, Ca and Ba, and also Ae' is chosen from Mg and Zn, in addition among them, Ae is desired to include Sr and Ae' to include Mg, and also x is a number in the following renge: 0.01<=x<=0.1).
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