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Manipulating the Injected Energy Flux via Host-Sensitized Nanostructure for Improving Multiphoton Upconversion Luminescence of Tm3+
Nano Letters ( IF 9.6 ) Pub Date : 2022-06-16 , DOI: 10.1021/acs.nanolett.2c01324
Xiaoyu Xie 1, 2 , Qiqing Li 1 , Haoran Chen 1, 2 , Wang Wang 1, 2 , Fengxia Wu 1, 3 , Langping Tu 1 , Youlin Zhang 1 , Xianggui Kong 1 , Yulei Chang 1
Affiliation  

Combating the concentration quenching effect by increasing the concentration of sensitized rare-earth ions in rational design upconversion nanostructure will make it easier to utilize injection energy flux and transfer it to emitters, resulting in improved upconversion luminescence (UCL). We proposed a host-sensitized nanostructure (active core@luminescent shell@inert shell) to improve multiphoton UCL of Tm3+ based on the LiLnF4 host. Yb3+ ions were isolated in the core as energy absorbents, and Tm3+ was doped in the interior LiYbF4 host shell. Compared with sandwich structured nanocrystals (Y@Y:Yb/Tm@Y), reverse structure (YbTm@Yb@Y), and fully doped structure (YbTm@YbTm@Y), the proposed structure achieved the highest efficiency of multiphoton UCL and favored a better FRET-based application performance as the Tm3+ located at an optimized spatial distribution. Furthermore, steady-state and dynamic analysis results demonstrate that by manipulating the spatial distribution of the active ions, excited energy can be tuned to enable multiphoton upconversion enhancement, overcoming the conventional limitations.

中文翻译:

通过主体敏化纳米结构操纵注入的能量通量以改善 Tm3+ 的多光子上转换发光

通过在合理设计的上转换纳米结构中增加敏化稀土离子的浓度来对抗浓度猝灭效应,将更容易利用注入能量通量并将其转移到发射器,从而改善上转换发光(UCL)。我们提出了一种基于LiLnF 4主体的主体敏化纳米结构(活性核@发光壳@惰性壳)来改善Tm 3+的多光子UCL 。Yb 3+离子被隔离在核心作为能量吸收剂,而 Tm 3+被掺杂在内部 LiYbF 4中主机外壳。与夹层结构纳米晶体(Y@Y:Yb/Tm@Y)、反向结构(YbTm@Yb@Y)和全掺杂结构(YbTm@YbTm@Y)相比,所提出的结构实现了多光子UCL的最高效率和有利于更好的基于 FRET 的应用性能,因为 Tm 3+位于优化的空间分布。此外,稳态和动态分析结果表明,通过操纵活性离子的空间分布,可以调整激发能量以实现多光子上转换增强,从而克服传统限制。
更新日期:2022-06-16
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