一维取向LTL型分子筛荧光阵列的快速组装

摘要

LTL type zeolite crystals with regular morphology, high crystallinity and different aspect ratio were successfully synthesized by adjusting the composition of the synthesis gel. Then, the or-ganolanthanide complexes were loaded inside of the zeolite LTL channels, denoted as zeolite LTL/Eu-TTA, by using the ‘ship-in-bottle’ method. The luminescence spectra analysis results show that the zeolite LTL/Eu-TTA crystal with 0. 2 aspect ratio has the strongest emission of 5 D0→7 F2 located at 617 nm, whereas the crystals with aspect ratio of 3 has the weakest one under the excitation of 350 nm. Finally, The fluorescent array extending to the centimeter scale was fabricated in an orien-ted way by rapid wiping the zeolite LTL/Eu-TTA crystals with 0 . 2 aspect ratio in 10 s on the surface of PEI coated glass substrate. SEM results prove that nearly all zeolite LTL crystals compact closely with their c-axial perpendicularly to the glass surface in a monolayer manner. This one-dimensional orientated fluorescent array can issue bright red light under the excitation of 365 nm.%通过有效控制合成液配比，合成出了形貌规则、结晶度高且具有不同长径比的LTL型分子筛晶粒。采用“瓶中造船法”，在不同长径比的LTL型分子筛晶粒孔道中组装稀土有机配合物，制得LTL分子筛/Eu-TTA主-客体荧光材料。荧光光谱表征结果表明，在激发波长为350 nm时，长径比为0.2的LTL分子筛/Eu-TTA晶粒在617 nm处的5 D0→7 F2发光强度最大，而长径比为3的晶粒发光强度最小。最后，将长径比为0.2的LTL分子筛/Eu-TTA晶粒在PEI修饰的玻璃表面快速擦涂10 s后，就制得厘米尺寸的一维取向LTL型分子筛荧光阵列。 SEM表征结果证实，该分子筛荧光阵列中几乎所有的LTL分子筛晶粒都沿着与底基表面垂直的c轴方向一维高密度、单层有序排列。在激发波长为365 nm时，该一维取向LTL分子筛荧光阵列发出鲜艳的红色荧光。