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| 1 | Hollow nanoparticles synthesized via Ostwald ripening and their upconversion luminescence-mediated Boltzmann thermometry over a wide temperature range显示文摘Upconversion nanoparticles(UCNPs)with hollow structures exhibit many fascinating optical properties due to their special morphology.However,there are few reports on the exploration of hollow UCNPs and their optical applications,mainly because of the difficulty in constructing hollow structures by conventional methods.Here,we report a one-step template-free method to synthesize NaBiF4:Yb,Er(NBFYE)hollow UCNPs via Ostwald ripening under solvothermal conditions.Moreover,we also elucidate the possible formation mechanism of hollow nanoparticles(HNPs)by studying the growth process of nanoparticles in detail.By changing the contents of polyacrylic acid and H2O in the reaction system,the central cavity size of NBFYE nanoparticles can be adjusted.Benefiting from the structural characteristics of large internal surface area and high surface permeability,NBFYE HNPs exhibit excellent luminescence properties under 980 nm near-infrared irradiation.Importantly,NBFYE hollow UCNPs can act as self-referenced ratiometric luminescent thermometers under 980 nm laser irradiation,which are effective over a wide temperature range from 223 K to 548 K and have a maximum sensitivity value of 0.0065 K^(−1)at 514 K.Our work clearly demonstrates a novel method for synthesizing HNPs and develops their applications,which provides a new idea for constructing hollow structure UCNPs and will also encourage researchers to further explore the optical applications of hollow UCNPs. | Ran An Yuan Liang Ruiping Deng Pengpeng Lei Hongjie Zhang | 2022 | Light(Science & Applications)2022，11，8： | 3 |
| 2 | Monte Carlo模拟在稀土掺杂发光材料能量传递机理研究中的应用进展显示文摘高性能可调控的稀土发光材料及相关物理机制的探究是设计和开发新型发光材料与器件的重点与难点。其中,揭示离子间复杂的微观相互作用产生的能量传递特性一直是稀土掺杂发光材料研究中的关键问题。Monte Carlo模拟是一种依赖大量重复的随机抽样获得数值结果的统计模拟方法,是稀土发光领域中结合基质晶体结构、离子掺杂行为、荧光衰减动力学数据等对离子间能量传递机理进行系统研究的重要工具。本文首先简要介绍Monte Carlo模拟的基本原理及建模方法;然后从影响能量传递的相互作用机理和几何因素出发,概述了利用Monte Carlo方法研究离子间能量传递的进展;最后进行总结并对该方法在稀土发光材料中的应用进行了展望。 | 禹庭 郑成中 赵闪闪 曾庆光 禹德朝 张大伟 | 2022 | 发光学报2022，43，9： | 1 |
| 3 | Less is more:dimensionality reduction as a general strategy for more precise luminescence thermometry显示文摘Thermal resolution(also referred to as temperature uncertainty)establishes the minimum discernible temperature change sensed by luminescent thermometers and is a key figure of merit to rank them.Much has been done to minimize its value via probe optimization and correction of readout artifacts,but little effort was put into a better exploitation of calibration datasets.In this context,this work aims at providing a new perspective on the definition of luminescence-based thermometric parameters using dimensionality reduction techniques that emerged in the last years.The application of linear(Principal Component Analysis)and non-linear(t-distributed Stochastic Neighbor Embedding)transformations to the calibration datasets obtained from rare-earth nanoparticles and semiconductor nanocrystals resulted in an improvement in thermal resolution compared to the more classical intensity-based and ratiometric approaches.This,in turn,enabled precise monitoring of temperature changes smaller than 0.1℃.The methods here presented allow choosing superior thermometric parameters compared to the more classical ones,pushing the performance of luminescent thermometers close to the experimentally achievable limits. | ERVING XIMENDES RICCARDO MARIN LUIS DIAS CARLOS DANIEL JAQUE | 2022 | Light(Science & Applications)2022，11，9： | 1 |
| 4 | 熔盐法合成Yb^(3+)、Ho^(3+)掺杂CaBi_(4)Ti_(4)O_(15)及其上转换发光温敏性研究显示文摘通过熔盐法合成了Yb^(3+)、Ho^(3+)共掺杂CaBi_(4)Ti_(4)O_(15)荧光粉,研究其结构、形貌、上转换荧光和荧光温度传感特性。X射线衍射结果显示,所有样品都为纯相的铋层氧化物结构,随着Ho^(3+)掺杂浓度的提高,晶格收缩,引起了(119)衍射峰向高角度偏移。扫描电镜照片显示合成的粉末样品呈片状结构,长宽分布从百纳米到微米量级,厚度小于200 nm。合成的荧光粉末材料在980 nm红外激光激发下,发出明亮的可见光,其上转换发光对温度变化有明显的响应。基于归一化荧光强度的温敏发光实验结果表明,基于绿光发射带的温敏特征在488 K时有最大灵敏度0.00497 K^(-1),在583 K时有最大相对灵敏度1.01%K^(-1)。研究表明,熔盐法合成的具有片状结构的Yb^(3+)、Ho^(3+)共掺杂CaBi_(4)Ti_(4)O_(15)荧光粉在上转换荧光温度传感领域有很大的应用价值。 | 刘震 王瑞雪 孙凯文 孙健文 凌新程 | 2023 | 金陵科技学院学报2023，39，3： | 0 |
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