Postsynthetic modification represents an efficient strategy for the fabrication of tunable metal−organic frameworks (MOFs) and derived highperformance functional materials. Herein, we report the synthesis of a mixed-linker zinc(II)-based double-layered MOF (dlMOF) with dual-emissive luminescence, which was further applied as a host matrix to fabricate highly tunable Ln@dlMOF materials (Ln = Eu, Tb, Eu/Tb). The emission characteristics of these materials can be readily modulated over a wide spectrum, including white light emission, by simply tuning the Eu 3+ /Tb 3+ molar ratio in EuTb@dlMOF. Furthermore, by virtue of the difference in thermal sensitivity between triple-emissive sources, the Eu 3+ / Tb 3+ -codoped thermometer EuTb@dlMOF exhibits real-time successive chromogenic switches from red (room temperature) to white (intermediate temperature) to blue/green (cryogenic temperature) emission in a wide temperature region. The versatile performance and the facile assembly from easily available linkers suggest that postsynthetic lanthanide encapsulation represents an efficient strategy for the future engineering of advanced photoluminescent materials with stimuli-responsive and thermochromic properties.

Negative thermal quenching (NTQ), an abnormal phenomenon that the intensity of photoluminescence (PL) increases with increasing temperature, has essentially been restricted to either bulk semiconductors or very low temperatures. Here,...

For a pyridinium-based emitter with fluorescence–phosphorescence dual emission, mechanical grinding induces phosphorescence disappearance and mechanical pressing induces extraordinary phosphorescence enhancement.

The peak photoluminescence (PL) of conventional fluorophores is independent of the excitation wavelength (called Kasha's rule), while the search of metal−organic framework materials with the so-called anti-Kasha's rule emission remains very limited. Herein, we report the observation of anti-Kasha's rule emission in a multicomponent PL three-dimensional nanotubular metal−organic framework (abbr.-3,5-dicarboxylic acid; bix = 1,4bis(imidazole-1-ylmethyl)benzene]. The MOF-NT crystalline sample represents a notable example of strong excitation-dependent fluorescence from the ultraviolet to the visible spectral region. Moreover, by virtue of electronic flexibility and high PL efficiency, MOF-NT shows a discriminative PL response between isomeric nitroaromatic compounds. The work demonstrated the intrinsic anti-Kasha's rule emission in the crystalline-state MOF materials, providing new visions for the development of advanced solid-state emissive materials.

Heterometallic grids or rhomboids, in which two or more different metal ions are periodically segregated throughout a lattice, can give rise to emergent synergistic multifunctionalities but are typically static in nature because of strong metal–ligand binding. Here, a heterobimetallic C 2-symmetric rhomboid, [Zn2Dy2] (1), was self-assembled from a naphthol-containing asymmetric ligand and 3d/4f mixed-metal ions. We show that a heavy structural twist of bridge ligands around the heterometallic centers can induce a translation (“stretch–elastic phase” behavior) related to the shape of the metallorhomboid and facilitates a luminescence response to external stimuli, such as temperature, mechanical pressure, etc.