A Luminescent Guest@MOF Nanoconfined Composite System for Solid-State Lighting |
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| Authors: | Tao Xiong Yang Zhang Nader Amin Jin-Chong Tan |
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| Institution: | 1.Multifunctional Materials & Composites (MMC) Laboratory, Department of Engineering Science, University of Oxford, Parks Road, Oxford OX1 3PJ, UK; (T.X.); (Y.Z.);2.Department of Chemistry, University of Oxford, Mansfield Road, Oxford OX1 3TA, UK; |
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| Abstract: | A series of rhodamine B (RhB) encapsulated zeolitic imidazolate framework-8 (RhB@ZIF-8) composite nanomaterials with different concentrations of guest loadings have been synthesized and characterized in order to investigate their applicability to solid-state white-light-emitting diodes (WLEDs). The nanoconfinement of the rhodamine B dye (guest) in the sodalite cages of ZIF-8 (host) is supported by fluorescence spectroscopic and photodynamic lifetime data. The quantum yield (QY) of the luminescent RhB@ZIF-8 material approaches unity when the guest loading is controlled at a low level: 1 RhB guest per ~7250 cages. We show that the hybrid (luminescent guest) LG@MOF material, obtained by mechanically mixing a suitably high-QY RhB@ZIF-8 red emitter with a green-emitting fluorescein@ZIF-8 “phosphor” with a comparably high QY, could yield a stable, intensity tunable, near-white light emission under specific test conditions described. Our results demonstrate a novel LG@MOF composite system exhibiting a good combination of photophysical properties and photostability, for potential applications in WLEDs, photoswitches, bioimaging and fluorescent sensors. |
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| Keywords: | Luminescent Guest@MOF (LG@MOF) rhodamine B fluorescein nanoconfinement quantum yield (QY) MOF-LED guest-host interactions |
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