Thermal Annealing and Doping Induced Tailoring of Phase and Upconversion Luminescence of NaYF4:Yb Er Microcrystals

IF 2.7 3区工程技术 Q2 ENGINEERING, MECHANICAL

Nanoscale and Microscale Thermophysical Engineering Pub Date : 2022-01-02 DOI:10.1080/15567265.2022.2028044

Shivanand H. Nannuri, Sana Adnan, Subash C K, S. C, S. George

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引用次数: 3

Abstract

ABSTRACT The influence of Mn2+ ion concentration (x = 0–20 mol%) as well as the role of thermal-annealing temperature (400–600°C) on the structural as well as luminescence properties of NaYF4:Yb, Er (Y: 78-x%, Yb: 20%, Er: 2%) microcrystals prepared via a coprecipitation method is investigated. The cubic phase of the as-prepared NaYF4:Yb, Er (Y: 78%, Yb: 20%, Er: 2%) was found to remain intact upon the addition of the Mn2+ ions, but the thermal-annealing elucidates that the phase of the sample depends upon the annealing temperature as well as the Mn2+ ion concentration. Among the Mn2+ ion co-doped samples, 3 mol% doped samples dominant to have a maximum positive influence on the upconversion luminescence of the sample, and a further increase in concentration leads to the concentration-induced quenching of the upconversion luminescence. Moreover, the enhancement factor of green ( ), as well as red ( ) emission, depend upon the annealing temperature, with a maximum enhancement factor of 5 and 3.12 times for the sample annealed at 400°C, 8.6 and 7.25 times for the sample annealed at 500°C, and 6 and 4 times for the sample annealed at 600°C, as compared to Mn2+ ion undoped samples. The maximum emission strength for the green as well as red is observed for the sample annealed at 600°C and co-doped with 3 mol Mn2+ ions. The laser power-dependent study on all the samples shows that the upconversion process is a multi-photon process, predominantly a two-photon process. Graphical abstract

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热退火和掺杂诱导的NaYF4:Yb Er微晶体的相位裁剪和上转换发光

研究了Mn2+离子浓度(x = 0 ~ 20 mol%)和热退火温度(400 ~ 600℃)对共沉淀法制备的NaYF4:Yb, Er (Y: 78 ~ x%， Yb: 20%， Er: 2%)微晶结构和发光性能的影响。制备的NaYF4:Yb, Er (Y: 78%， Yb: 20%， Er: 2%)的立方相在加入Mn2+离子后保持完整，但热退火表明样品的相取决于退火温度和Mn2+离子浓度。在Mn2+共掺杂样品中，3mol %掺杂对样品上转换发光的正向影响最大，浓度的进一步增加导致上转换发光的浓度诱导猝灭。此外，与未掺杂Mn2+的样品相比，绿色()和红色()发射的增强因子与退火温度有关，400℃退火样品的最大增强因子为5倍和3.12倍，500℃退火样品的最大增强因子为8.6倍和7.25倍，600℃退火样品的最大增强因子为6倍和4倍。在600°C退火并与3mol Mn2+离子共掺杂的样品中观察到绿色和红色的最大发射强度。所有样品的激光功率依赖性研究表明，上转换过程是一个多光子过程，主要是一个双光子过程。图形抽象

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来源期刊

Nanoscale and Microscale Thermophysical Engineering 工程技术-材料科学：表征与测试

CiteScore

5.90

自引率

2.40%

发文量

审稿时长

3.3 months

期刊介绍： Nanoscale and Microscale Thermophysical Engineering is a journal covering the basic science and engineering of nanoscale and microscale energy and mass transport, conversion, and storage processes. In addition, the journal addresses the uses of these principles for device and system applications in the fields of energy, environment, information, medicine, and transportation. The journal publishes both original research articles and reviews of historical accounts, latest progresses, and future directions in this rapidly advancing field. Papers deal with such topics as: transport and interactions of electrons, phonons, photons, and spins in solids, interfacial energy transport and phase change processes, microscale and nanoscale fluid and mass transport and chemical reaction, molecular-level energy transport, storage, conversion, reaction, and phase transition, near field thermal radiation and plasmonic effects, ultrafast and high spatial resolution measurements, multi length and time scale modeling and computations, processing of nanostructured materials, including composites, micro and nanoscale manufacturing, energy conversion and storage devices and systems, thermal management devices and systems, microfluidic and nanofluidic devices and systems, molecular analysis devices and systems.