Versatile Cl-decorated CPM-5 as a blue LED and luminescent sensor for selective Fe3+ sensing and temperature detection

Abstract

The development and utilization of versatile metal–organic framework (MOF) materials for fluorescence applications have received the attention of many researchers. In this study, we constructed a versatile luminescent Cl-decorated CPM-5 (CPM-5-Cl) by employing InCl₃ and H₃BTC in a DMF/H₂O/HCl solvent system. The as-synthesized CPM-5-Cl was characterized using PXRD, SEM, EDX mapping, and TGA–DTG. Interestingly, CPM-5-Cl exhibited not only excellent thermal and water stability but also unique solid-state fluorescence emission performance. The CIE coordinate and luminescence photo under UV light indicated CPM-5-Cl as a promising candidate for blue light-emitting diodes. Furthermore, as a ratiometric thermometer, CPM-5-Cl exhibited highly sensitive temperature sensing over a wide temperature range (80–300 K), and the maximum relative sensitivity of CPM-5-Cl reached 3.08% K⁻¹ at 300 K. Moreover, CPM-5-Cl exhibited high selectivity for Fe³⁺ detection with low detection limits (2.25 × 10⁻⁴ M) in aqueous solution. It was tested for anti-interference properties, recyclability, and the mechanism of Fe³⁺ sensing. Our research provides new opportunities for the design and synthesis of versatile fluorescent In-MOFs.