第1-2讲：Electronic Structure Calculations for Lanthanide Materials (Part 1)
主讲人：Mike Reid教授
单位：新西兰Canterbury大学物理和化学学院
时间：2018年1月16日 9:00AM
地点：纳米楼一楼报告厅
第3-4讲：Electronic Structure Calculations for Lanthanide Materials (Part 2)
主讲人：Mike Reid教授
单位：新西兰Canterbury大学物理和化学学院
时间：2018年1月16日 10:30AM
地点：纳米楼一楼报告厅
第5-6讲：High-resolution spectroscopy of CaF2:Eu3+ nanoparticles: Investigation of the defect distribution in biomedical imaging materials
主讲人：Mike Reid教授
单位：新西兰Canterbury大学物理和化学学院
时间：2018年1月18日 2:30PM
地点：纳米楼一楼报告厅
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简介：
Reid教授现任新西兰Canterbury大学物理和化学科学学院的院长，是国际知名的稀土光谱理论专家，他首创的f族元素电子结构与跃迁计算程序包，用户遍及全球，为目前该领域最权威的计算软件。他也是中科院海西研究院固体光谱学和光物理国际研究中心的国际顾问委员。 本次集中授课他将在一周时间主讲三次课程，第一和第二次为稀土光谱理论基础和计算程序介绍，第三次为以纳米发光材料为例的应用介绍。
These tutorial sessions will introduce calculation methods for electronic structure of lanthanide (rare-earth) materials, relevant to phosphor applications. The emphasis will be on doing some simple calculations by hand, in order to get a feel for how the calculations work. This is essential background for attempting computer calculations.
The first session will concentrate on energy levels, and the second will touch on transition intensities.
Material for these sessions may be downloaded from my Personal Home Page: http://www2.phys.canterbury.ac.nz/~mfr24/
There you will find:
1.Electronic Structure Calculations Handout, detailed notes: http://www2.phys.canterbury.ac.nz/~mfr24/electronicstructure/00electronic.pdf
2.Tutorial Presentation (Asia, January 2018), PowerPoint slides: http://www2.phys.canterbury.ac.nz/~mfr24/electronicstructure/reid_tutorial_2018_01.pdf
3.Preprint of a Review, Theory of Rare-Earth Electronic Structure and Spectroscopy: http://www2.phys.canterbury.ac.nz/~mfr24/electronicstructure/respectroscopy_preprint.pdf
Please print the Handout and Tutorial Presentation in advance, or have it on a computer or tablet.
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High-resolution spectroscopy of CaF2:Eu3+ nanoparticles: Investigation of the defect distribution in biomedical imaging materials
Michael F Reid
School of Physical and Chemical Sciences, Te Kura Matū
University of Canterbury, Christchurch, New Zealand
Lanthanide-doped luminescent nanoparticles are important candidates for low-toxicity imaging agents and intracellular nano-thermometers for biomedical applications [1]. Lanthanide ions doped into bulk CaF2 crystals are known to form a variety of sites, and to form clusters at concentrations as low as 0.01 mol%, becoming the dominant centre by 0.1 mol% [2, 3]. This clustering gives enhanced energy transfer,promising significant improvements in applications requiring up-conversion or down-conversion via energy transfer.
Previous work on lanthanide-doped CaF2 nanoparticles has made use of low-resolution spectroscopy at high temperatures, and was therefore unable to discriminate between the different sites. Indeed, work on sodium-stabilized Eu3+-doped CaF2 nanoparticles [2] makes the assumption that the sites are predominately C4v(F-), though sodium is known to suppress C4v(F-) sites in bulk crystals.
In this work we present high resolution laser spectroscopy of core-only sodium-stabilized CaF-2:Eu3+ nano-particles at cryogenic temperatures (10 K). Selective excitation and emission, and lifetime measurements are presented. C4v(F-) sites appear to be suppressed in these materials. An enhancement of Oh and C2v(Na+), sites, and evidence of cluster and surface sites is observed. We are currently investigating nano-particles with inert shells to confirm the presence of surface states and co-doped samples to isolate potential cluster centres.