Heteronuclear MOF Heterostructures Based on Identical Auxiliary-Ligand Bridging for Multi-Function-Integrated Photonic Devices.

Metal-organic framework (MOF) heterostructures with multi-segmented emission and integrated responsiveness hold great potential application in integrated photonic devices, yet reported MOF heterostructures always focus on the assembly of homologous chromophore ligands with similar energy levels, restricting their further function integration. Herein, the first heteronuclear MOF heterostructure is reported based on an identical auxiliary-ligand bridging strategy towards multi-function-integrated photonic devices. Designed ligands with distinct chromophore structures were epitaxially assembled by identical auxiliary-ligand bridging method to construct the heteronuclear MOF heterostructures. Distinct chromophore structures of ligands endow each MOF block with different energy-level structures, which generate disparate photon-responsive behaviors and gain processes in different individual regions. On the basis, the heteronuclear MOF heterostructure can simultaneously integrate different photonic functionalities, including narrow-band light sources, optical modulation and optical waveguides, which further functions as a prototype of integrated photonic circuit with dynamic logic gate operation. These results offer a novel strategy for the development of MOF heterostructures for multifunctional integrated photonic devices.