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| 1 | One ion to catch them all: Targeted high-precision Boltzmann thermometry over a wide temperature range with Gd^(3+)显示文摘Ratiometric luminescence thermometry with trivalent lanthanide ions and their 4f^(n) energy levels is an emerging technique for non-invasive remote temperature sensing with high spatial and temporal resolution.Conventional ratiometric luminescence thermometry often relies on thermal coupling between two closely lying energy levels governed by Boltzmann’s law.Despite its simplicity,Boltzmann thermometry with two excited levels allows precise temperature sensing,but only within a limited temperature range.While low temperatures slow down the nonradiative transitions required to generate a measurable population in the higher excitation level,temperatures that are too high favour equalized populations of the two excited levels,at the expense of low relative thermal sensitivity.In this work,we extend the concept of Boltzmann thermometry to more than two excited levels and provide quantitative guidelines that link the choice of energy gaps between multiple excited states to the performance in different temperature windows.By this approach,it is possible to retain the high relative sensitivity and precision of the temperature measurement over a wide temperature range within the same system.We demonstrate this concept using YAl_(3)(BO_(3))_(4)(YAB):Pr^(3+),Gd^(3+)with an excited 6 PJ crystal field and spin-orbit split levels of Gd^(3+)in the UV range to avoid a thermal black body background even at the highest temperatures.This phosphor is easily excitable with inexpensive and powerful blue LEDs at 450 nm.Zero-background luminescence thermometry is realized by using blue-to-UV energy transfer upconversion with the Pr^(3+)−Gd^(3+)couple upon excitation in the visible range.This method allows us to cover a temperature window between 30 and 800 K. | Dechao Yu Huaiyong Li Dawei Zhang Qinyuan Zhang Andries Meijerink Markus Suta | 2021 | Light(Science & Applications)2021，10，12： | 4 |
| 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 |
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