Collaborative Research: From Synthesis, Local and Electronic Structures, to Optical and Scintillating Properties of Lanthanoid Hafnate Nanoparticles

合作研究：从合成、局域和电子结构到镧系铪酸盐纳米粒子的光学和闪烁特性

• 批准号: 1952803
• 负责人: Yuanbing Mao
• 金额: $ 12.16万
• 依托单位: Illinois Institute of Technology
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2019
• 资助国家: 美国
• 起止时间: 2019-08-01 至 2021-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1952803&HistoricalAwards=false
• 关键词: Collaborative; Research; Synthesis; Local; Electronic

Many chemical substances have the property of emitting radiation, called luminescence, which is useful in light-emitting applications. Lanthanide luminescence plays a vital role in our daily life due to the unique optical properties of these ions with respect to light generation and amplification. Extending from laser physics, other familiar applications in our regular life include lighting, displays, optical telecommunications, night vision, security inks, counterfeiting tags, luminescent coatings, medical imaging, medical diagnostics, and airport security checks. New and more effective luminescent materials are desirable from both a technological and an economic necessity in order to make cheap, widely available, and long-lasting light emitting, or photonic, devices. Dr. Yuanbing Mao of the University of Texas Rio Grande Valley and Dr. James Dorman of Louisiana State University are making metal oxide nanoparticles with increased luminescence by developing new preparation methods. Using various techniques and in collaboration with scientists at Oak Ridge National Laboratory, the research team is figuring out how their reliable synthesis methods make these nanoparticles ultra-small and uniformly shaped and sized, at more than 1000 times smaller than the diameter of a human hair. The team also studies the relationship between the size, shape, structure, composition, and luminescence performance of these nanoparticles. The fundamental understanding gained in this project helps the future design of new luminescent nanomaterials, photonic devices, and nanoparticle synthesis methods. Dr. Mao's and Dr. Dormans's research is attractive to students at many levels, emphasizing the involvement of underrepresented students as research assistants. The research team has introduced a university-wide seminar series and several new course modules. Through these activities, Drs. Mao and. Dorman directly raise awareness and advocacy for nanoscience and optoelectronic materials among varied demographic groups as a way to improve the community, the national economy, and the environment. The partnership focuses on building a strong pipeline for underrepresented students and enabling fruitful student-faculty exchange programs between the two universities.In this research program, Dr. Yuanbing Mao of the University of Texas Rio Grande Valley (UTRGV) and Dr. James Dorman of Louisiana State University (LSU) are supported by the Macromolecular, Supramolecular and Nanochemistry (MSN) Program to develop a reliable synthetic process, understandthe growth mechanism, investigate the size effects, and correlate the crystal, local and electronic structures with the optical and scintillating properties of these lanthanoid hafnate nanophosphors. Ex situ and in situ techniques are used to elucidate the synthetic parameters which determine the particle size and structural parameters for these Ln2Hf2O7 nanoparticles. Based on the obtained results, growth mechanisms of these nanoparticles are developed for directed design of luminescent nanoparticles based on application specifications. Next, the relationship between the crystal, local, and electronic structures of these nanoparticles and their luminescent properties is probed via complementary techniques, such as Raman spectroscopy, synchrotron X-ray and neutron diffractions, X-ray absorption, emission and photoelectron spectroscopies, photoluminescence, and radioluminescence. In addition, this study provides general guidance for proper selection of Ln2Hf2O7 compounds for suitable applications in a wide variety of devices, such as solid electrolytes in high temperature solid oxide fuel cells, thermal barrier coatings, and nuclear waste storage. Dr. Mao involves high school, undergraduate, and graduate students, with an emphasis on underrepresented students, in his research, and has introduced a university-wide seminar series and new course modules which highlight the topics of his team?'research. He and Dr. James Dorman of the Louisiana State University (LSU) communicate science to students at all age levels, directly raising awareness and advocacy for nanoscience and optoelectronic materials among varied demographic groups as a way to improve the community, the national economy, and the environment. The activities also build a strong pipeline for underrepresented students and enable fruitful student-faculty exchange programs between UTRGV and LSU.

许多化学物质具有发射辐射的性质，称为发光，这在发光应用中是有用的。 镧系发光在我们的日常生活中起着至关重要的作用，这是由于这些离子在光的产生和放大方面具有独特的光学性质。从激光物理学延伸，我们日常生活中的其他熟悉应用包括照明，显示器，光学电信，夜视，安全油墨，伪造标签，发光涂层，医学成像，医学诊断和机场安全检查。 从技术和经济需要两方面来看，需要新的和更有效的发光材料，以便制造廉价、广泛可用和持久的发光或光子器件。德克萨斯大学格兰德河谷分校的Yuanbing Mao博士和路易斯安那州州立大学的James Dorman博士正在通过开发新的制备方法来制造发光增强的金属氧化物纳米颗粒。使用各种技术并与橡树岭国家实验室的科学家合作，研究小组正在弄清楚他们可靠的合成方法如何使这些纳米颗粒超小，形状和大小均匀，比人类头发直径小1000倍以上。该团队还研究了这些纳米颗粒的大小，形状，结构，成分和发光性能之间的关系。在这个项目中获得的基本理解有助于未来设计新的发光纳米材料，光子器件和纳米颗粒合成方法。毛博士和多尔曼博士的研究对许多层次的学生都有吸引力，强调代表性不足的学生作为研究助理的参与。研究小组推出了一个全校范围的系列研讨会和几个新的课程模块。通过这些活动，毛博士和。Dorman直接提高了不同人口群体对纳米科学和光电材料的认识和宣传，以此作为改善社区、国民经济和环境的一种方式。该合作伙伴关系的重点是为代表性不足的学生建立一个强大的管道，并使两所大学之间富有成效的师生交流计划成为可能。在这个研究项目中，德克萨斯大学格兰德河谷分校（UTRGV）的毛元兵博士和路易斯安那州立大学（LSU）的詹姆斯·多尔曼博士得到了大分子，超分子和纳米化学（MSN）计划的支持，以开发一种可靠的合成工艺，理解生长机制，研究尺寸效应，并将晶体结构、局域结构和电子结构与这些镧系元素钨酸盐纳米荧光体的光学和发光性质联系起来。非原位和原位技术被用来阐明的合成参数，确定这些Ln2Hf2O7纳米粒子的粒径和结构参数。基于所获得的结果，这些纳米粒子的生长机制开发的发光纳米粒子的应用规格的基础上，直接设计。接下来，这些纳米颗粒的晶体，本地和电子结构和它们的发光性能之间的关系，通过互补的技术，如拉曼光谱，同步加速器X射线和中子衍射，X射线吸收，发射和光电子光谱，光致发光和放射性发光探测。此外，这项研究提供了一般的指导，适当选择的Ln2Hf2O7化合物的各种设备，如固体电解质在高温固体氧化物燃料电池，热障涂层和核废料储存的合适的应用。毛博士涉及高中，本科和研究生，重点是代表性不足的学生，在他的研究，并介绍了一个大学范围内的研讨会系列和新的课程模块，突出了他的团队的主题？“研究。他和路易斯安那州立大学（LSU）的James Dorman博士向各个年龄段的学生传播科学，直接提高不同人口群体对纳米科学和光电材料的认识和倡导，以此改善社区，国民经济和环境。这些活动还为代表性不足的学生建立了强大的渠道，并使UTRGV和LSU之间富有成效的师生交流计划成为可能。

项目成果

High pressure induced disappearing 5D0 → 7F2 and broadening 5D0 → 7F1 transitions from Y2Hf2O7:Eu3+ nanoparticles

• DOI: 10.1016/j.matlet.2021.130560
• 发表时间: 2021-11
• 期刊: Materials Letters
• 影响因子: 3
• 作者: S. Gupta;Yuanbing Mao

Effects of molten-salt processing parameters on the structural and optical properties of preformed La2Zr2O7:Eu3+ nanoparticles

• DOI: 10.1016/j.ceramint.2019.09.098
• 发表时间: 2020-02
• 期刊: Ceramics International
• 影响因子: 5.2
• 作者: Mitzy A. Penilla Garcia;S. Gupta;Yuanbing Mao

pH induced size tuning of Gd2Hf2O7:Eu3+ nanoparticles and its effect on their UV and X-ray excited luminescence

• DOI: 10.1016/j.jlumin.2020.117605
• 发表时间: 2020-12-01
• 期刊: JOURNAL OF LUMINESCENCE
• 影响因子: 3.6
• 作者: Gupta, Santosh K.;Garcia, Mitzy A. Penilla;Mao, Yuanbing
• 通讯作者: Mao, Yuanbing

Pressure-induced site swapping, luminescence quenching, and color tunability of Gd2Hf2O7:Eu3+ nanoparticles

• DOI: 10.1016/j.optmat.2020.110789
• 发表时间: 2021-02
• 期刊: Optical Materials
• 影响因子: 3.9
• 作者: S. Gupta;Hisham Abdou;Yuanbing Mao

Disorder driven asymmetry and singular red emission in doped Lu2Hf2O7 nanocrystals with no charge compensating defects

• DOI: 10.1016/j.jlumin.2021.118057
• 发表时间: 2021-07
• 期刊: Journal of Luminescence
• 影响因子: 3.6
• 作者: S. Gupta;Mitzy A. Penilla Garcia;J. Zuniga;B. B. Srivastava-B.;Yuanbing Mao