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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：自组装珍珠项链图案的上转换纳米晶体具有高效的蓝色和紫外发射：基于飞秒激光的上转换特性

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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：这项工作报告了有关在自组装上转换纳米晶体（UCN-PNs）中形成珍珠项链图案的新发现，该晶体在飞秒激光（Fs-laser）的NIR激发源下表现出较强的上转换发射。每条纳米项链均由数个大小约为1的上转换纳米颗粒（UCNP）组成。 10±1纳米UCN-PN以自组织的方式排列，以形成单行纳米粒子平均长度为140 nm的项链型链。此外，UCN-PN由UCNP组成，平均粒子间间距约为。每个纳米项链链中的4 nm。有趣的是，这些UCN-PN在80 MHz重复频率下与140 Fs激光脉冲持续时间相互作用时表现出高能量上转换，特别是在UV区域中，与900 nm激发源相互作用时在450 nm处获得强烈的蓝色发射。自组装的UCNPs的制备很容易，并且在较长的时间内非常稳定。发射（荧光/发光）强度非常高，通过以高效率靶向被感染的细胞，可以使其在无数的工业和生物应用（例如疾病诊断和治疗应用）中独树一帜。

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