Production manner of light storage Characteristic fluorescent powder of particulate condition and light storage Characteristic fluorescent powder null of particulate

摘要

PROBLEM TO BE SOLVED: To produce a particulate luminous fluorescent powder having a great luminous intensity, a long emission time and excellent in water resistance by using an aluminate of an alkaline earth metal containing Eu as a main activator. ;SOLUTION: This particulate luminous fluorescent powder comprises an aluminate of an alkaline earth metal containing Eu as a main activator. The composition of the fluorescent powder is represented by the following formula: (A_1-x-yD_xE_y)O.a(G_1-zH_z)₂O₃ [A is one kind of Mg, Ca, Sr and Ba which are alkaline earth metals and bivalent metal Zn; D is an activator Eu; E is one or more kinds of elements selected from the group of lanthanoids Dy, Nd, Pr, Ho, Er, Tm, Yb and Lu and transition metals Mn, Zr, Nb, Ti, Sb, Li, Ge, In and W which are a coactivator; G is Al of a mother crystal substance; H is B or Ga of a substrate crystal substance; 0.0001≤(x)≤0.5; 0.0001≤(y)≤0.3; 0.0001≤(z)≤0.5; 0.5≤(a)≤3.0].;COPYRIGHT: (C)1999,JPO