A novel luminescent Mn–organic framework with a rare [Mn ₄ (μ ₃ -OH) ₂ ] cluster was successfully afforded by employing a TPE-based tetracarboxylate linker, and exhibited excellent fluorescence properties for blue LED and low-temperature detection fields.

Introducing lanthanide(III) ions into a MOF structure is one of the most effective strategies to construct luminescent MOFs with multiple emission centers for fluorescent applications. In this work, a functionalized Eu³⁺-doped Y-MOF (Eu@SNNU-325) was constructed by using a cation exchange strategy. The photoluminescence result shows that Eu@SNNU-325 exhibits a unique emission spectrum, namely, the absence of the organic ligand peak and the very strong Y³⁺/Eu³⁺ characteristic peaks. Interestingly, the smart luminescent Eu@SNNU-325 as a ratiometric thermometer for temperature sensing has good self-calibrated ability and a high maximum relative sensitivity (S_m) value (1.2% K⁻¹ at 260 K). This work presents the construction of a smart Eu³⁺-functionalized Y-MOF thermometer through a cation exchange strategy, providing a good idea for the future development and design of Y-MOF thermometers.

The development and utilization of 3p-block based MOFs as fluorescent materials has attracted significant attention in recent years. Herein, we have successfully constructed a versatile luminescent Ga-MOF (SNNU-63) with a 3d¹⁰ configuration and a large ligand twist configuration. Interestingly, the as-synthesized Ga-MOF exhibits excellent luminescence property and a good material for blue light-emitting diode (LED). At 80 K, this Ga-MOF shows multi-emission centers at 381, 462, and 494 nm. As a ratiometric thermometer, this Ga-MOF exhibits an excellent temperature sensing property with high relative sensitivity (S_m = 2.60 % K⁻¹ at 110 K). The fluorescence intensity ratio I₃₈₁/I₄₉₄ shows a very good fit for the Boltzmann results (80–240 K). Moreover, the luminescent Ga-MOF exhibits an excellent selective detection of Fe³⁺ over other metal ions in aqueous an medium, and the limit of detection (LOD) towards Fe³⁺ ions is calculated to be 1.227 × 10⁻⁴ M. This work presents a versatile luminescent Ga-MOF material as a blue LED and fluorescent probe for low-temperature and selective Fe³⁺ sensing.