Magnetic-Force-Induced-Luminescent Effect in Flexible ZnS:Cu/PDMS/NdFeB Composite

The force-induced light-emitting phenomenon in polymer composites plays an important role in the soft electronic field due to its display function. Here, a magnetic-force-induced-luminescence (MFIL) effect is reported in ZnS:Cu particle-doped polydimethylsiloxane incorporated with a NdFeB magnetic tip mass for real-time incident magnetic field strength light-emitting display. Investigations show that the luminescence intensity increases nearly linear in response to the applied AC magnetic field, H-AC; meanwhile, the minimum H-AC for inducing MFIL is as low as 0.1 mT (1 Oe) at the resonance. The MFIL effect is 1000 times better and more energy-efficient than the best result published previously. The findings, thus, indicate that the MFIL effect could serve as an effective method for light-emitting display triggered by H-AC; MFIL essentially originates from the donor-acceptor recombination between shallow donor level and the t(2) level of Cu-2 in ZnS:Cu semiconductor particles. The present results could, thus, provide a viable pathway toward multifunctional flexible electronic designs and applications, especially toward those for the real-time visualization of remote magnetic field sensing.