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Enhancing energy migration upconversion through a migratory interlayer in the core-shell-shell nanostructure towards latent fingerprinting.
Nanoscale ( IF 5.8 ) Pub Date : 2020-09-07 , DOI: 10.1039/d0nr03817b
Xixi Wang 1 , Long Yan , Songbin Liu , Peng Zhang , Rong Huang , Bo Zhou
Affiliation  

Mechanistic studies on photon upconversion play a critical role in the fundamental research of the luminescence of rare earth ions as well as their emerging applications. Energy migration mediated upconversion (EMU) has recently shown to be an important model for the photon upconversion of the lanthanide ions without the intermediate states. However, the EMU process is complex and there is seldom work regarding the interactions in the core–shell interfacial area that may impose a quenching effect on the resultant upconverison. Here, we report a strategy to enhance the upconversion luminescence by inserting a migratory NaGdF4 interlayer in the EMU model to minimize the unwanted quenching processes in the interfacial area. The design of a NaGdF4:Yb/Tm@NaGdF4@NaGdF4:A (A = Dy, Sm, Nd, Eu, Tb) core–shell–shell nanostructure indeed leads to an enhancement of photon upconversion under 980 nm excitation. The details of the interfacial quenching processes between the Tm3+ in the core and the emitters in the shell were investigated. Moreover, these optimized upconversion nanoparticles can be used in the multicolor latent fingerprint recognition with the secondary fingerprint details easily achievable, showing great potential in the anti-counterfeiting of fingerprints for information security.

中文翻译:

通过核-壳-壳纳米结构中的迁移夹层增强能量迁移向上转换,向潜在指纹转移。

光子上转换的机理研究在稀土离子的发光及其新兴应用的基础研究中起着至关重要的作用。最近,能量迁移介导的上转换(EMU)已成为无中间态的镧系离子光子上转换的重要模型。但是,动车组的过程很复杂,关于核-壳界面区域相互作用的工作很少,这可能会对最终的上转换产生抑制作用。在这里,我们报告了一种策略,该方法通过在EMU模型中插入迁移性NaGdF 4中间层来增强上转换发光,以最大程度地减少界面区域中不需要的淬灭过程。NaGdF 4的设计:Yb / Tm @ NaGdF 4@NaGdF 4:A(A = Dy,Sm,Nd,Eu,Tb)核-壳-壳纳米结构确实导致了980 nm激发下光子上转换的增强。研究了核中Tm 3+与壳中发射极之间的界面淬火过程的细节。而且,这些优化的上转换纳米颗粒可用于多色潜在指纹识别,具有易于获得的二级指纹细节,在防伪指纹信息安全方面显示出巨大潜力。
更新日期:2020-09-24
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