| 摘要 |
PURPOSE: A lanthanum gallate-based red fluorescent substance and its preparation method are provided, to improve the brightness at a low velocity electron ray and the stability under the high vacuum. CONSTITUTION: The lanthanum gallate-based red fluorescent substance is represented by La1-xGaO3;Eux, wherein x is a mole fraction of Eu to La and 0.0005<= x<=0.5, and preferably 0.05<= x <=0.2. The method comprises the steps of mixing lanthanum oxide(La2O3), gallium oxide(Ga2O3) and europium oxide(Eu2O3) with a mole fraction of Eu to La being 0.0005-0.5 to prepare a mixture; sintering the mixture at a temperature of 1,100-1,600 deg.C, preferably 1,200-1,400 deg.C at atmosphere to obtain a sintered one; and pulverizing the sintered one to obtain a red fluorescent substance. |
