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首页> 外文期刊>Advanced Functional Materials >A Multi-Functional Highly Efficient Upconversion Luminescent Film with an Array of Dielectric Microbeads Decorated with Metal Nanoparticles
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A Multi-Functional Highly Efficient Upconversion Luminescent Film with an Array of Dielectric Microbeads Decorated with Metal Nanoparticles

机译：带有金属纳米粒子修饰的电介质微珠阵列的多功能高效上转换发光膜

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摘要

Upconversion nanoparticles (UCNPs) have been integrated with photonic platforms to overcome the intrinsically low quantum efficiency limit of upconversion luminescence (UCL). However, platforms based on thin films lack transferability and flexibility, which hinders their broader and more practical application. A plasmonic structure is developed that works as a multi-functional platform for flexible, transparent, and washable near-infrared (NIR)-to-visible UCL films with ultra-strong UCL intensity. The platform consists of dielectric microbeads decorated with plasmonic metal nanoparticles on an insulator/metal substrate. Distinct improvements in NIR confinement, visible light extraction, and boosted plasmonic effects for upconversion are observed. With weak NIR excitation, the UCL intensity is higher by three orders of magnitude relative to the reference platform. When the microbeads are organized in a square lattice array, the functionality of the platform can be expanded to wearable and washable UCL films. The platform can be transferred to transparent, flexible, and foldable films and still emit strong UCL with a wide viewing angle.
机译：上转换纳米粒子（UCNP）已与光子平台集成，以克服上转换发光（UCL）固有的低量子效率极限。然而，基于薄膜的平台缺乏可转移性和灵活性，这阻碍了其更广泛，更实际的应用。已开发出等离子体结构，该结构可作为多功能平台，用于具有超强UCL强度的柔性，透明和可清洗的近红外（NIR）到可见UCL膜。该平台由在绝缘体/金属基板上装饰有等离子体金属纳米粒子的介电微珠组成。观察到NIR限制，可见光提取和上转换的增强等离子体效应的明显改善。在弱NIR​​激发下，UCL强度相对于参考平台要高三个数量级。当微珠以方格子阵列组织时，平台的功能可以扩展到可穿戴和可清洗的UCL膜。该平台可以转移到透明，柔性和可折叠的胶片上，并且仍会发出具有宽视角的强UCL。

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