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Inert Shell Effect on the Quantum Yield of Neodymium-Doped Near-Infrared Nanoparticles: The Necessary Shield in an Aqueous Dispersion.
Nano Letters ( IF 9.6 ) Pub Date : 2020-09-17 , DOI: 10.1021/acs.nanolett.0c03187 Artiom Skripka 1 , Antonio Benayas 2 , Carlos D S Brites 2 , Inocencio R Martín 3, 4 , Luís D Carlos 2 , Fiorenzo Vetrone 1
Nano Letters ( IF 9.6 ) Pub Date : 2020-09-17 , DOI: 10.1021/acs.nanolett.0c03187 Artiom Skripka 1 , Antonio Benayas 2 , Carlos D S Brites 2 , Inocencio R Martín 3, 4 , Luís D Carlos 2 , Fiorenzo Vetrone 1
Affiliation
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Lanthanide-doped nanoparticles (LnNPs) are versatile near-infrared (NIR) emitting nanoprobes that have led to their growing interest for use in biomedicine-related imaging. Toward the brightest LnNPs, high photoluminescence quantum yield (PLQY) values are attained by implementing core/shell engineering, particularly with an optically inert shell. In this work, a thorough investigation is performed to quantify how an outer inert shell maintains the PLQY of Nd3+-doped LnNPs dispersed in an aqueous environment. Three relevant quantitative findings affecting the PLQY of Nd3+-doped LnNPs are identified: (i) the PLQY of core LnNPs is improved 3-fold upon inert shell coating; (ii) PLQY decreases with increasing Nd3+ doping despite the inert shell; and (iii) solvent quenching has a major influence on the PLQY of the LnNPs, though it is relatively lessened for high Nd3+ doping. Overall, we shed new light on the impact of the LnNP architecture on the NIR emission, as well as on the quenching effects caused by doping concentration and solvent molecules.
中文翻译：
掺杂钕的近红外纳米粒子的量子产率的惰性壳效应：在水分散体中的必要屏蔽。
掺杂镧系元素的纳米粒子（LnNPs）是一种通用的近红外（NIR）发射纳米探针，已引起人们越来越多的兴趣，用于生物医学相关成像。对于最亮的LnNP，通过实施核/壳工程，尤其是使用光学惰性壳，可以获得高的光致发光量子产率（PLQY）值。在这项工作中，进行了彻底的研究以量化外部惰性壳如何保持分散在水性环境中的Nd 3+掺杂LnNP的PLQY 。鉴定了影响Nd 3+掺杂LnNPs PLQY的三个相关定量结果：（i）惰性外壳涂覆后，核心LnNPs的PLQY改善了3倍；（ii）PLQY随着Nd 3+的增加而降低尽管外壳是惰性的但仍掺杂；（iii）溶剂淬火对LnNPs的PLQY有主要影响，尽管对于高Nd 3+掺杂而言，它相对较小。总体而言，我们揭示了LnNP体系结构对NIR发射的影响以及掺杂浓度和溶剂分子引起的猝灭效应。
更新日期：2020-10-15
中文翻译：
掺杂钕的近红外纳米粒子的量子产率的惰性壳效应：在水分散体中的必要屏蔽。
掺杂镧系元素的纳米粒子（LnNPs）是一种通用的近红外（NIR）发射纳米探针，已引起人们越来越多的兴趣，用于生物医学相关成像。对于最亮的LnNP，通过实施核/壳工程，尤其是使用光学惰性壳，可以获得高的光致发光量子产率（PLQY）值。在这项工作中，进行了彻底的研究以量化外部惰性壳如何保持分散在水性环境中的Nd 3+掺杂LnNP的PLQY 。鉴定了影响Nd 3+掺杂LnNPs PLQY的三个相关定量结果：（i）惰性外壳涂覆后，核心LnNPs的PLQY改善了3倍；（ii）PLQY随着Nd 3+的增加而降低尽管外壳是惰性的但仍掺杂；（iii）溶剂淬火对LnNPs的PLQY有主要影响，尽管对于高Nd 3+掺杂而言，它相对较小。总体而言，我们揭示了LnNP体系结构对NIR发射的影响以及掺杂浓度和溶剂分子引起的猝灭效应。
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