Zhou Donglei, Tao Li, Cui Shaobo, Jiao Jiannan, Hu Junhua, Xu Wen
Opt Lett. 2021 Jan 1;46(1):5-8. doi: 10.1364/OL.403901.
nanoparticles (NPs) demonstrate unique tunable localized surface plasmon resonance (LSPR) and nonlinear optical properties, which are promising materials for photoelectric and display devices. In this work, we present highly improved upconversion luminescence (UCL) in the :, @:, @ core-shell structure. The UCL enhancement is systemically studied under excitation of multi-wavelengths 808, 980, and 1540 nm, due to the broadband nature of LSPR. Two different mechanisms synergistically contribute to the UCL enhancement, namely, the LSPR effect and two-photon effect, which lead to the extraordinary power dependence of UCL. UCL enhancement as high as 12-fold is achieved in the core-shell upconversion NPs (UCNPs). The core-shell NPs are printed on a paper substrate using a nano-printing technique, displaying different colors irradiated by different near-infrared light, and have potential applications in anti-counterfeiting, encryption, and display fields. These findings provide a method to design and optimize luminescent materials and demonstrate potential applications of plasmonic semiconductors and UCNPs.
纳米颗粒（NPs）展现出独特的可调节局域表面等离子体共振（LSPR）和非线性光学特性，是用于光电和显示设备的有前景的材料。在这项工作中，我们展示了在:,:,@核壳结构中高度增强的上转换发光（UCL）。由于LSPR的宽带特性，在808、980和1540 nm多波长激发下对UCL增强进行了系统研究。两种不同的机制协同促成了UCL增强，即LSPR效应和双光子效应，这导致了UCL非凡的功率依赖性。在核壳上转换纳米颗粒（UCNPs）中实现了高达12倍的UCL增强。使用纳米印刷技术将核壳纳米颗粒印刷在纸质基底上，在不同近红外光照射下显示出不同颜色，并且在防伪、加密和显示领域具有潜在应用。这些发现提供了一种设计和优化发光材料的方法，并展示了等离子体半导体和UCNPs的潜在应用。
