A novel strategy for improving upconversion luminescence of NaYF4:Yb, Er nanocrystals by coupling with hybrids of silver plasmon nanostructures and poly(methyl methacrylate) photonic crystals
A novel strategy for improving upconversion luminescence of NaYF4:Yb, Er nanocrystals by coupling with hybrids of silver plasmon nanostructures and poly(methyl methacrylate) photonic crystals
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DOI：
10.1007/s12274-013-0358-y
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发表时间：
2013-08
期刊：
影响因子：
9.9
通讯作者：
Wen Xu;Yongsheng Zhu;Xu Chen;Jing Wang;Li Tao;Sai Xu;Tong Liu;Hongwei Song
中科院分区：
文献类型：
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作者：
Wen Xu;Yongsheng Zhu;Xu Chen;Jing Wang;Li Tao;Sai Xu;Tong Liu;Hongwei Song
将上转换荧光粉（UCNPs）与贵金属表面等离子体共振（SPR）耦合是提高UCNPs发光效率的一种有效途径，但如何通过这种耦合实现稳定、可重复和有效的上转换发光增强仍是一个挑战。在这项工作中，我们提出了一种新的策略，以提高UCL的NaYF4：Yb 3+，Er 3 +UCNPs，结合近场耦合的SPR的银和聚甲基丙烯酸甲酯（PMMA）蛋白石光子晶体（OPC）与UCNPs的远场耦合。为了控制UCNPs和SPR之间的有效相互作用距离，制备了由随机分布的银纳米颗粒（NPs）（> 100 nm）组成的多孔银膜，其在宽波长范围内表现出强SPR，并且发现其与UCNPs的耦合比致密膜强得多。在OPC的远场耦合中，PMMA OPC的光子阻带（PSB）被调谐到980 nm，与激发光精确匹配。通过调节UCNPs的粒径、入射光的方向和激发功率，观察到最大增强60倍，这是金属诱导的UCL增强系统的重要进展。
The coupling of upconversion nanophosphors (UCNPs) with the surface plasmonic resonance (SPR) of noble metals is a promising way to improve luminescent efficiency of UCNPs; however, it is still a challenge to achieve stable, reproducible and effective upconversion luminescence (UCL) enhancement through such coupling. In this work, we present a novel strategy to improve UCL of NaYF4:Yb3+,Er3+UCNPs, by combining the near-field coupling of SPR of silver and the far-field coupling of poly(methyl methacrylate) (PMMA) opal photonic crystals (OPCs) with the UCNPs. In order to control the effective interaction distance between the UCNPs and the SPR, a porous silver film consisting of randomly distributed silver nanoparticles (NPs) (> 100 nm) was prepared which demonstrated strong SPR over a broad wavelength range, and its coupling to the UCNPs was found to be much stronger than that of a dense film. In the far-field coupling of OPCs, the photonic stop band (PSB) of the PMMA OPCs was tuned to 980 nm, matching exactly the excitation light. By modulating the particle size of the UCNPs, and the direction and excitation power of the incident light, a maximum enhancement of 60-fold was observed, which is an important advance for metal-induced UCL enhancement systems.