High-Efficiency Host-to-Guest Energy Transfer within Complex Multicomponent Luminescent Metal-Organic Frameworks

Förster resonance energy transfer (FRET) is a fundamental process in natural photosynthesis, inspiring the development of artificial energy transfer systems for the efficient utilization of light. High-porosity metal-organic frameworks (MOFs) with hierarchical pore structures and structural tunability have emerged as ideal platforms for constructing host-to-guest FRET systems, however it remains a challenge to rationally design high-efficiency luminescent MOF (LMOF)-based host-guest FRET systems. Herein, we report an anionic multicomponent LMOF─Zn-AD-TBPP─assembled from photosensitive octatopic pyrene-core-based TBPP linkers and zinc-adeninate vertex secondary building units─for the efficient encapsulation of cationic red-emitting dyes, yielding a host-guest system with a strong spectral overlap. The composite exhibits a high FRET efficiency exceeding 90% and a photoluminescence quantum yield of about 51.1%. This composite is used for constructing high-quality white-light-emitting diodes and exhibits prominent two-photon excited fluorescence emission. This work paves a way for the construction of complex donor-functionalized host LMOFs, accommodating acceptor chromophores, displaying high-efficiency host-to-guest energy transfer.