报告一：Upconverting-and plasmonic nanoparticles-some reflections on recent results and opportunities

 报告人：Hans Ågren教授，

 Department of Physics and Astronomy, Uppsala University, Uppsala, SE-75120, Sweden

 时间：5月22号上午9:30-10:20； 

 地点：北区国家科技园1号楼N308

 Abstract

 Lanthanide upconversion nanoparticles (UCNPs) have emerged as an important group of photoluminescent nanomaterials over the last twenty years. Their unique optical properties of converting low-energy near-infrared (NIR) photons into higher-energy NIR, visible or even ultraviolet ones have opened new avenues in wide-ranging applications, covering healthcare, information technology, and energy. In developing the optical properties of UCNPs, core-shell structural engineering has been well established as a powerful strategy to boost the brightness and enrich the functionalities of the UCNPs. In the present talk I will give a brief review of some recent and not so-recent contributions by our group in the field of UPCNs, focusing on their use as IR upvonverters in solar cells and for some particular applications in bioimaging. Taking account of the several intrinsic processes for their operation it is shown how core-shell UPCN structures can be designed for improved performance.  

 I the second part of my talk I will demonstrate the capability of a newly derived semi-empirical, so-called, extended discrete interaction model for calculations of plasmonic properties of ultrasmall nanoparticles in this domain. Plasmon dependencies on size, shape, material, temperature, melting and environment are explored by this model. Likewise plasmon properties with respect to red/blue shifts, hot/cold field spots and refractive index sensitivity in this ultrafine region are predicted. Some ongoing and near future applications are discussed.

 报告二：Novel strategies of electroluminescence for sustainable OLED technology （电致发光新策略发展可持续OLED技术）

 报告人：Glib Baryshnikov助理教授 

 Linköping University, Department of Science and Technology, Laboratory of Organic Electronics, SE-60174, Norrköping, Sweden

 时间：5月22号上午10:30-11:20；

 地点：北区国家科技园1号楼N308

 Abstract

 Over the past few decades organic electronics became one of the most important fields of science for the humanity. The significant competitive potential of organic light emitting diodes (OLEDs) and a number of design and technological features have created preconditions for widespread commercialization of OLEDs as basic elements in display technologies, automotive engineering, biomedicine and dynamic lighting systems. In this talk I discuss new strategies for development of emitters for OLEDs such as room temperature microsecond-scaled phosphorescence of metal-free materials, thermally activated delayed fluorescence from two chromophores in a single molecule, luminescence of radicals. This should finally result in fabrication of red, green, blue and full-color OLED prototypes with improved characteristics (efficiency, cost, stability) as compared to current state-of-art. The successful implementation of these advanced strategies can be realized in a most efficient way by using purposeful computational design (including conformational analysis and combinatorial chemistry principles) as a first stage before start of organic synthesis step. I also discuss in my talk how efficient could be quantum-chemical simulations in comprehensive studies of newly synthesized materials and in fabrication of OLED prototypes to support a sustainable development in this field.

 报告三：Entropy in organic semiconductors

 报告人：姚尧，华南理工大学物理与光电学院

 时间：5月22号上午11:30-12:10；

 地点：北区国家科技园1号楼N308