| 摘要 |
PURPOSE:To enhance light emission efficiency, by incorporating a small amt. of fluorine in strontium magnesium borate phosphor activated with divalent europium. CONSTITUTION:0.1-1% fluorine is incorporated in strontium magnesium borate phosphor of the formula (wherein 0.07<=x<=0.3; 0.003<=y<=0.04; 1.7<=z<=2) activat ed with divalent europium to prepare the purpose phosphor. The phosphor exhibits high luminence in comparison with a fluosine-free phosphor. The phos phor is prepd. in the following method. Raw material powders such as SrCO3, MgCO3, H3BO3 and Eu2O3 powders are mixed in a predetermined proportion, packed in a crucible, subjected to primary baking, crushed, and then mixed with 0.1-1%, in terms of fluorine, fluoride such as MgF2 or NH4F. The resul tant mixture is subjected to reducing backing in a hydrogen-contg. gas stream, crushed and sieved.
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