Triboelectric Leakage-Field-Induced Electroluminescence Based on ZnS:Cu

Abstract

The related studies and applications of ZnS-based phosphorescent materials involve various aspects such as lighting, display, sensing, electronic signatures, and confidential information. Here, triboelectrification-induced electroluminescence (TIEL) of the ZnS:Cu due to the triboelectric leakage field is discovered via a gently horizontal sliding between a ZnS:Cu particle-doped polydimethylsiloxane (PDMS) film and a polytetrafluoroethylene (PTFE) or fluorinated ethylene propylene (FEP) film, whose intensity is positively correlated with the temperature, the doping ratio of ZnS:Cu, the pressure, and the frequency. It is also demonstrated that the TIEL mainly occurs inside the bulk film, where the ZnS:Cu phosphor particles can be polarized instantaneously by the leakage electric field of triboelectrification. The polarization will lead to a tilted energy band of the ZnS, resulting in an emitting of green light due to electrons detrapped into the conduction band and recombined with holes in the impurity state. This study not only reveals great fundamental physics for understanding of luminescence induced by a simple sliding between two triboelectric materials but also indicates another way for triboelectrification to be used in advanced optoelectronic devices.

Recyclable photoluminescent composites via incorporating ZnS‐based phosphors into dynamic crosslinking elastomeric matrixes

“…A photoluminescent phenomenon can be observed, when the excited electrons are recombined with holes on the impurity state of doped metallic elements. [ 9,38,59 ] Due to the excellent PL performance of ZnS‐based phosphors and limited influence of the elastomeric matrixes, the first step of PL in dynamic crosslinking elastomeric matrix/phosphor composites is to generate excited electrons under external light irradiating. Considering the lighting barrier effect of elastomeric matrixes, UV–vis spectra were recorded to evaluate the light absorption of the samples.…”

“…The luminescent intensity of the bulk film was also investigated under various conditions. [38] From the perspective of sustainability, it is highly desired to avoid resource waste and environmental pollution, resulting from permanent crosslinking polymers as well as corresponding composites. Fortunately, vitrimers and vitrimer-like materials, [39,40] a type of novel polymer consisted of crosslinking networks with dynamic covalent bonds, have been receiving substantial attention.…”

Designing a self-classifying smart device with sensor, display, and radiative cooling functions via spectrum-selective response

“…S1b and c, ESI †). [31][32][33] Second, band-engineered core/shell nanocrystals (NCs) are incorporated into the PDMS active layer of the display, acting as photoluminescence (PL) phosphors in UV light detection sensors. We designed the band structure of the NCs such that the NCs respond only to UV light to indicate whether the user has been exposed to UV light and emit light at 527 nm (green) to distinguish them from the display light at 450 nm (blue).…”

A flexible organic mechanoluminophore device

“…The ML materials are primarily based on piezophotonic effect directly converting the external mechanical energy into light emission without the assistance of electron or photon excitation 4 , 5 , 11 . The second is triboelectrification-induced electroluminescence (TIEL), which owes to the coupling effect between triboelectrification and electroluminescence (EL) 12 – 16 . The triboelectric charges yielded from contacting and/or sliding behavior at the interfaces of the TIEL materials generate a strong electric field in the emitting material that leads to electron transitions into luminescence center and thus generates EL 19 .…”