Comparison of YAG:Nd3+-Yb3+ nanothermometers synthesized by Pechini and solvothermal methods

IF 3.3 3区 物理与天体物理 Q2 OPTICS
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Abstract

Luminescence intensity ratio-based nanothermometry is a widely studied thermal sensing technique in the literature. Regarding biological purposes, it is essential to have thermal probes that are efficient in this type of environment. Thermal bioprobes demand highly crystallized nanocrystals, commonly smaller than 100 nm, with luminescence emissions in the near-infrared range that are not significantly absorbed by biological tissues. Several nanomaterials that have been studied for nanothermometry do not meet the requirements for this type of applications. Accordingly, researches are needed to develop suitable and reliable nanothermometers for thermal sensing. Therefore, our goal was to investigate the impact of Nd3+-Yb3+ co-doping on the thermometric performance of YAG matrix, a promising crystal because it presents a host structure favoring the insertion of lanthanide ions, which provide its luminescent features. In order to achieve this purpose, we first synthesized YAG:Nd3+-Yb3+ nanocrystals through a generic route - called modified Pechini method - to screen their thermal properties. Our results show that YAG:Nd3+-Yb3+ nanocrystals have the potential to work in vivo environments. The nanothermometers investigated here are excited in the first biological window (BW-I) at 805 nm with luminescence emissions within the BW-II, at 1030.5 and 1064 nm. By co-doping the YAG matrix with different Nd3+-Yb3+ concentrations, we studied the energy transfer process between the dopant ions and their impact on thermometry efficiency. By the efficient coupling of the Nd3+-Yb3+ pair, we improved the Sr value by a factor of 3 of YAG compounds up to 0.6 %.K−1. We then synthesized YAG:Nd3+-Yb3+ nanocrystals using a second type of synthesis, by solvothermal means, in order to obtain individual nanocrystals, well dispersed in aqueous solutions, and to adapt their morphology and size for biological purposes. Therefore, we compared the structural and luminescence properties and thermometry efficiencies of YAG:Nd3+-Yb3+ nanocrystals obtained through two distinct processes and showed that the nanothermometry properties are not affected by the synthesis method.
比较用 Pechini 法和溶热法合成的 YAG:Nd3+-Yb3+ 纳米温度计
基于发光强度比的纳米测温技术是文献中广泛研究的一种热感应技术。就生物目的而言,必须要有在这类环境中有效的热探针。热敏生物探针需要高度结晶的纳米晶体,通常小于 100 纳米,在近红外范围内发光,不会被生物组织明显吸收。已研究过的几种用于纳米温度测量的纳米材料并不符合这类应用的要求。因此,需要开展研究,以开发用于热感应的合适而可靠的纳米温度计。因此,我们的目标是研究 Nd3+-Yb3+ 共掺杂对 YAG 基体测温性能的影响,YAG 基体是一种很有前途的晶体,因为它具有有利于镧系离子插入的宿主结构,而镧系离子则提供了发光特性。为了实现这一目的,我们首先通过一种名为改良 Pechini 法的通用路线合成了 YAG:Nd3+-Yb3+ 纳米晶体,并对其热性能进行了筛选。结果表明,YAG:Nd3+-Yb3+ 纳米晶体具有在体内环境中工作的潜力。这里研究的纳米温度计在波长为 805 纳米的第一生物窗口(BW-I)内激发,在波长为 1030.5 纳米和 1064 纳米的第二生物窗口(BW-II)内发光。通过在 YAG 矩阵中共同掺入不同浓度的 Nd3+-Yb3+ 离子,我们研究了掺杂离子之间的能量转移过程及其对测温效率的影响。通过 Nd3+-Yb3+ 对的高效耦合,我们将 YAG 化合物的 Sr 值提高了 3 倍,达到 0.6 %.K-1。然后,我们采用第二种合成方法,即溶热法合成了 YAG:Nd3+-Yb3+ 纳米晶体,以获得在水溶液中分散良好的单个纳米晶体,并使其形态和尺寸适应生物目的。因此,我们比较了通过两种不同工艺获得的 YAG:Nd3+-Yb3+ 纳米晶体的结构、发光特性和测温效率,结果表明纳米测温特性不受合成方法的影响。
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来源期刊
Journal of Luminescence
Journal of Luminescence 物理-光学
CiteScore
6.70
自引率
13.90%
发文量
850
审稿时长
3.8 months
期刊介绍: The purpose of the Journal of Luminescence is to provide a means of communication between scientists in different disciplines who share a common interest in the electronic excited states of molecular, ionic and covalent systems, whether crystalline, amorphous, or liquid. We invite original papers and reviews on such subjects as: exciton and polariton dynamics, dynamics of localized excited states, energy and charge transport in ordered and disordered systems, radiative and non-radiative recombination, relaxation processes, vibronic interactions in electronic excited states, photochemistry in condensed systems, excited state resonance, double resonance, spin dynamics, selective excitation spectroscopy, hole burning, coherent processes in excited states, (e.g. coherent optical transients, photon echoes, transient gratings), multiphoton processes, optical bistability, photochromism, and new techniques for the study of excited states. This list is not intended to be exhaustive. Papers in the traditional areas of optical spectroscopy (absorption, MCD, luminescence, Raman scattering) are welcome. Papers on applications (phosphors, scintillators, electro- and cathodo-luminescence, radiography, bioimaging, solar energy, energy conversion, etc.) are also welcome if they present results of scientific, rather than only technological interest. However, papers containing purely theoretical results, not related to phenomena in the excited states, as well as papers using luminescence spectroscopy to perform routine analytical chemistry or biochemistry procedures, are outside the scope of the journal. Some exceptions will be possible at the discretion of the editors.
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