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鉴于燃烧法合成的发光粉体的表面形貌、结构不同于传统的高温固相法的产品,针对性的研究了燃烧法合成的SrAl_2O_4∶Eu~(2+),Dy~(3+)发光粉体的有机包覆问题。实验采用了硅烷偶联剂(MAPS)直接包覆和MAPS+聚甲基丙烯酸甲酯(PMMA)有机复合包覆法2种包覆方法,并通过耐水性测试、荧光光谱、IR和SEM等测试手段进行分析研究。结果显示2种方法均能实现有效包覆,并显著的改善发光粉体的耐水性,但MAPS直接包覆后粉体的瞬时发光强度要优于MAPS+PMMA有机复合包覆法。MAPS用量选择在1.0mL左右较为适宜。相比较高温固相法,燃烧法产物包覆量较大,发光强度下降显著,这是由于粉体具有疏松多孔的内部结构而导致的。
In view of the surface morphology and structure of the luminescent powder synthesized by the combustion method are different from those of the conventional high-temperature solid-state method, the luminescent properties of SrAl 2 O 4: Eu 2+ and Dy 3+ synthesized by the combustion method are studied in detail. Organic powder coating problems. Two kinds of coating methods: direct coating with silane coupling agent (MAPS) and organic composite coating with MAPS + PMMA, were adopted in the experiment. Through the test methods of water resistance, fluorescence, IR and SEM Analytical research. The results show that both methods can achieve effective coating, and significantly improve the light-emitting powder water resistance, but the MAPS direct coating powder instantaneous luminous intensity is superior to MAPS PMMA organic composite coating method. MAPS dosage options in about 1.0mL more appropriate. Compared with the high-temperature solid-state method, the product of combustion method has a larger coating amount and a significant decrease in luminous intensity due to the loose porous internal structure of the powder.