Tunable fluorescence emission based on multi-layered MOF-on-MOF
Qing‐Qing Xia, Xinghuo Wang, Jialin Yu, Zhi‐Yuan Xue, Juan Chai, Ming‐Xue Wu, Xiaomin Liu
Abstract
encapsulation and seed-mediated synthesis. ZIF-8@dye@ZIF-8@dye materials with different fluorescence emission in dispersed and solid states were both obtained by tuning the initial encapsulation concentration of dye and changing the structure of the inner and outer ZIF-8@dye layers. To our delight, [email protected]@ZIF-8@25RhB with white light emission in the dispersed state was obtained; meanwhile, [email protected] + 25RhB and mechanically mixed [email protected] + ZIF-8@25RhB could not realize white light emission under the same conditions, indicating that the proposed hierarchical confinement strategy facilitated white light regulation. Similarly, the emission of ZIF-8@dye@ZIF-8@dye in the solid state has also been investigated; ZIF-8@perylene@ZIF-8@3RhB with white light emission was obtained, while white light emission could not be achieved in ZIF-8@perylene + 3RhB and ZIF-8@perylene + ZIF-8@3RhB, which further indicated the importance of the hierarchical confinement strategy based on MOF-on-MOF. The proposed hierarchical confinement strategy may also inspire the development of other functional optical MOF materials.