| 摘要 |
PROBLEM TO BE SOLVED: To obtain a phosphor having a high afterglow luminance and a long afterglow time by forming a phosphorescent phosphor having a specific Eu- activated or Pb-activated structure. SOLUTION: The Eu-activated phosphorescent phosphor is represented by the formula: MO.aSi02.bR2O.cX.dM'203; EuyLnz, is efficiently excited by the irradiation with visible light or an ultraviolet ray of 254 nm and has a luminescent peak at a wavelength of 530 nm or higher and a luminescent peak at a wavelength of 440-530 nm, The Pb-activated phosphorescent phosphor is represented by the formula: MO.aSiO2.bR2OcX.dM'2O3;PbyLnz, is excited by the irradiation with an ultraviolet ray of 254 nm and has the maximum peak at a wavelength of 440 nm or lower, In the formulas, M is Ba, Sr, Ca, Mg or Zn; R is Li, Na or K; X is F, Cl, Br or I; M' is B or Al; the coactivator Ln is Sc, Y, La, Ce, Pr, Nd, Ti, Zr, Hf or the like; 0<=a<=0.4; 0<=b<=0.1; 0<=c<=0.1; 0<=d<=0.1; 0.00001<=y<=0.1: and 0<=z<=0.3.
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