Broad-Temperature-Range Thermoresponse of Cu(I)-Based Organic-Inorganic Hybrid Metal Halides with Multimode Dynamic Luminescence
Organic-inorganic hybrid metal halides (OIMHs) based on Cu(I) ions exhibit broad application prospects in stimulus-responsive luminescent materials due to their rich structural diversity and highly adjustable electronic states. However, achieving sensitive and broad-temperature-range thermal responses remains a significant challenge. Here, we synthesize a zero-dimensional warm white-light emitting OIMH, MPC-W ((C9H20N2O)4(Cu2I4)(Cu2I6)(H2PO2)2), using 4-morpholinopiperidine (4-MP) and CuI. MPC-W features hybrid structures of [Cu2I4]2− and [Cu2I6]4−. The coexistence of three luminescent mechanisms—organic cluster luminescence (CL), self-trapped exciton (STE) emission of [Cu2I6]4−, and cluster-centered (CC) state luminescence of [Cu2I4]2−—endows MPC-W with temperature- and excitation-wavelength-dependent dynamic luminescence. From 77 to 297 K, the luminescence color continuously tunes from blue to cyan, green, yellow-green, and white. In the range of 217–463 K, MPC-W exhibits abnormal luminescence enhancement with increasing temperature. Upon chemical stimuli, MPC-W reversibly transforms into blue-emitting MPC-B ((C9H20N2O)Cu2I4) and yellow-emitting MPC-Y ((C9H18N2O)7Cu8I8). These dynamic luminescent properties position MPC-W for applications in temperature sensing, optical anti-counterfeiting, and password locks. This work provides new insights for developing wide-temperature-responsive multifunctional intelligent luminescent materials.