Interfacial Triboelectricity Lights Up Phosphor-Polymer Elastic Composites: Unraveling the Mechanism of Mechanoluminescence in Zinc Sulfide Microparticle-Embedded Polydimethylsiloxane Films,Small

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Interfacial Triboelectricity Lights Up Phosphor-Polymer Elastic Composites: Unraveling the Mechanism of Mechanoluminescence in Zinc Sulfide Microparticle-Embedded Polydimethylsiloxane Films
Small ( IF 13.0 ) Pub Date : 2024-01-07 , DOI: 10.1002/smll.202307089
Gyudong Lee _{1,

2} , Seongkyu Song ₃ , Woo Hyeon Jeong _{1,

4} , Cheoljae Lee ₂ , June-Seo Kim ₁ , Ju-Hyuck Lee ₂ , Jongmin Choi ₂ , Hyosung Choi ₄ , Younghoon Kim ₅ , Sung Jun Lim ₁ , Soon Moon Jeong _{3,

6}

Affiliation

Composites comprising copper-doped zinc sulfide phosphor microparticles embedded in polydimethylsiloxane (ZnS:Cu–PDMS) have received significant attention over the past decade because of their bright and durable mechanoluminescence (ML); however, the underlying mechanism of this unique ML remains unclear. This study reports empirical and theoretical findings that confirm this ML is an electroluminescence (EL) of the ZnS:Cu phosphor induced by the triboelectricity generated at the ZnS:Cu microparticle–PDMS matrix interface. ZnS:Cu microparticles that exhibit bright ML are coated with alumina, an oxide with strong positive triboelectric properties; the contact separation between this oxide coating and PDMS, a polymer with strong negative triboelectric properties, produces sufficient interfacial triboelectricity to induce EL in ZnS:Cu microparticles. The ML of ZnS:Cu–PDMS composites varies on changing the coating material, exhibiting an intensity that is proportional to the amount of interfacial triboelectricity generated in the system. Finally, based on these findings, a mechanism that explains the ML of phosphor–polymer elastic composites (interfacial triboelectric field-driven alternating-current EL model) is proposed in this study. It is believed that understanding this mechanism will enable the development of new materials (beyond ZnS:Cu–PDMS systems) with bright and durable ML.

中文翻译：

界面摩擦电点亮荧光粉-聚合物弹性复合材料：揭示硫化锌微粒嵌入聚二甲基硅氧烷薄膜中的机械发光机制

由嵌入聚二甲基硅氧烷中的铜掺杂硫化锌荧光粉微粒（ZnS:Cu-PDMS）组成的复合材料由于其明亮且持久的机械致发光（ML）而在过去十年中受到了极大的关注。然而，这种独特的机器学习的潜在机制仍不清楚。本研究报告的经验和理论结果证实该 ML 是由 ZnS:Cu 微粒-PDMS 基质界面处产生的摩擦电引起的 ZnS:Cu 荧光粉的电致发光 (EL)。表现出明亮 ML 的 ZnS:Cu 微粒涂有氧化铝，这是一种具有强正摩擦电特性的氧化物；这种氧化物涂层和PDMS（一种具有强负摩擦电特性的聚合物）之间的接触分离产生足够的界面摩擦电以在ZnS:Cu微粒中诱导EL。 ZnS:Cu-PDMS 复合材料的 ML 随着涂层材料的变化而变化，其强度与系统中产生的界面摩擦电量成正比。最后，基于这些发现，本研究提出了一种解释荧光体-聚合物弹性复合材料的ML（界面摩擦电场驱动的交流EL模型）的机制。人们相信，了解这一机制将有助于开发具有明亮且耐用的 ML 的新材料（超越 ZnS:Cu-PDMS 系统）。

更新日期：2024-01-07

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