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首页> 外文期刊>RSC Advances >Self-assembled pearl-necklace patterned upconverting nanocrystals with highly efficient blue and ultraviolet emission: femtosecond laser based upconversion properties
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Self-assembled pearl-necklace patterned upconverting nanocrystals with highly efficient blue and ultraviolet emission: femtosecond laser based upconversion properties

机译：自组装珍珠项链采用高效的蓝色和紫外线排放的上变频纳米晶体：Femtosecond激光的基于增强性能

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摘要

This work reports new findings on the formation of a pearl-necklace pattern in self-assembled upconverting nanocrystals (UCN-PNs) which exhibit strong upconversion emission under an NIR excitation source of a femtosecond laser (Fs-laser). Each nano-necklace consists of several upconversion nanoparticles (UCNPs) having a size ca. 10 +/- 1 nm. UCN-PNs are arranged in a self-organized manner to form necklace type chains with an average length of 140 nm of a single row of nanoparticles. Furthermore, UCN-PNs are comprised of UCNPs with an average interparticle separation of ca. 4 nm in each of the nanonecklace chains. Interestingly, these UCN-PNs exhibit high energy upconversion especially in the UV region on interaction with a 140 Fs-laser pulse duration at 80 MHz repetition rate and intense blue emission at 450 nm on interaction with a 900 nm excitation source is obtained. The preparation of self-assembled UCNPs is easy and they are very stable for a longer period of time. The emission (fluorescence/luminescence) intensity is very high which can make them unique in innumerable industrial and bio-applications such as for disease diagnosis and therapeutic applications by targeting the infected cells with enhanced efficiency.
机译：这项工作报告了在自组装的上变频纳米晶体（UCN-PNS）中形成珍珠项链图案的新发现，其在飞秒激光器（FS-Laser）的NIR激发源下表现出强大的上变速发射。每个纳米项链由几个具有尺寸Ca的Upconversion纳米颗粒（UCNP）组成。 10 +/- 1nm。 UCN-PNS以自组织方式布置，以形成项链型链，其平均长度为140nm的单行纳米颗粒。此外，UCN-PNS由UCNP组成，具有平均颗粒分离的CA.在每个纳米颈段链中4nm。有趣的是，这些UCN-PNS表现出高能量上变化，特别是在UV区域中，在与80MHz重复率的140FS-激光脉冲持续时间的相互作用中，获得了450nm的强烈的蓝色发射与900nm激励源的相互作用。自组装的UCNP的制备容易，并且它们在较长时间内非常稳定。发射（荧光/发光）强度非常高，这可以使它们在无数工业和生物应用中是独特的，例如通过以提高效率靶向感染细胞的疾病诊断和治疗应用。

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    《RSC Advances》 |2019年第65期|共11页
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  • 正文语种 eng
  • 中图分类 化学;
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