Enhanced Multiphoton Upconversion in Single Nanowires by Waveguiding Excitation
Enhanced Multiphoton Upconversion in Single Nanowires by Waveguiding Excitation
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DOI：
10.1002/adom.201600086
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发表时间：
2016-08
影响因子：
9
通讯作者：
Jiajia Zhou;Fuxing Gu;Xiaofeng Liu;J. Qiu
中科院分区：
文献类型：
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作者：
Jiajia Zhou;Fuxing Gu;Xiaofeng Liu;J. Qiu
通过沿着整个NW引导光可以显著地增强光。[ 30-34 ]其中，独特光学效应的基本原理是光在其沿着长度（通常为数十至数百微米）波导期间的紧密约束，这实现了包括降低激光阈值、高空间分辨率和增强光学灵敏度的吸引人的优点。因此，通过在微尺度上使用局部光约束效应，在NaREF 4家族中实现强烈的多光子上转换可能是一种很好的方法。然而，对于这种波导激发方案，1D NW框架携带NaREF 4纳米晶体是必要的。为此，我们设计了一种混合结构，即，NaGdF 4 -LiF纳米线，其中β-NaGdF 4作为上转换光学功能的主体，LiF作为波导以限定激发光。LiF经常被用作激光晶体，具有光学材料的两个优异特性：与其他盐相比，耐湿性和相对硬度。[ 35-37 ]锂是一种小原子，被证明是取代原子或间隙原子，可增强NaREF 4中的上转换发光。[38，39]
light can be signifi cantly enhanced by guiding light along the entire NW. [ 30–34 ] Among them, the basic principle for a unique optical effect is the tight confi nement of light during its waveguiding along the length (usually tens to hundreds of micrometers), which achieves attractive advantages including reduced lasing threshold, high spatial resolution, and enhanced optical sensitivity. Therefore, potentially a wonderful approach would be to realize intense multiphoton up-conversion in the family of NaREF 4 through use of a localized light-confi nement effect on the microscale. However, for this waveguiding excitation scheme, 1D NW frameworks to carry NaREF 4 nanocrystals are necessary. For this purpose, we design a hybrid structure, i.e., NaGdF 4 -LiF NWs, in which β-NaGdF 4 serves as the host for an up-conversion optical functionality and the LiF acts as the waveguide to confi ne the excitation light. LiF was frequently used as a laser crystal with two excellent properties for optical materials: resistance to moisture and relatively hardness compared to other salts. [ 35–37 ] Lithium is a small atom and is proven as a substitutional atom or interstitial atom to enhance the up-conversion luminescence in NaREF 4 . [ 38,39 ]