通过沉淀-燃烧法合成了SrAl2 O4∶Eu2+,Dy3+长余辉材料,对合成样品进行了物相、形貌、发光特性研究,探讨了尿素用量对材料发光性能的影响.结果表明,当尿素用量为原料中金属硝酸盐总物质的量的6倍时,产物主晶相为单斜晶系的SrAl2O4;激发、发射光谱均为宽带谱,峰值分别位于368nm、518nm处;测得初始发光亮度为18700mcd/m2,在暗室中放置9天后,仍可观察到明显发光现象.
SrAl2O4∶ Eu2+ ,Dy3+ long afterglow phosphor is successfully prepared by precipitation combustion synthesis, and phase compositions, particle morphology and luminescent properties are investigated. Effect of CO (NH2)2on the luminescent properties is also discussed. When the CO(NH2 )2 is 6 times the quantity of nitrate, the main crystal phase of the product is monoclinic phase of SrAl2O4. The excitation and emission spectra are broad bands with the peaks at 368nm and 518nm, respectively. The initial luminescent intensity is up to 18700mcd/m2, and the afterglow lasted for 9 days after the phosphor is excited.
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