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基质孔径对Eu-MCM-41复合材料荧光强度的影响

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Abstract:

采用微波水热法合成不同孔径的介孔分子筛(mesoporousmolecularsieve,MCM-41),通过Pechini溶胶–凝胶法合成Eu-MCM-41,并将EuPO4Zn晶体沉积在MCM-41表面,研究介孔材料孔径对荧光强度的影响。结果表明EuPO4Zn无荧光,Eu-MCM-41发出很强的蓝光(468nm)和橙光(593nm);当EuPO4Zn颗粒的孔径小于3.1nm时,荧光强度随孔径的增大而增加,大于3.1nm时,则相反。影响铕离子(Ⅲ)的发光强度主要有量子点的密度、铕离子中心的分裂和量子点的集聚程度,并且都与MCM-41的孔径有关,在改变选择规则的同时也影响磁偶极子,尤其使得f→f转换的量子跃迁成为可能。

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