X-ray scintillators are scintillation-based detectors, which absorb and down convert high-energy ionizing radiation into ultraviolet-visible light for detection of X-rays. They are actively used in many areas, including medical imaging, non-invasive inspection, radiation monitoring, and so on. Most of commercially available X-ray scintillators are based on inorganic single crystals, which are prepared via energy-consuming high temperature processes. To reduce energy consumption for material preparation, many organic scintillators have been developed via low temperature processes, which however have inferior performance than inorganic ones with low scintillation light yields and resolutions. Another issue of inorganic single crystal X-ray scintillators is the lack of flexibility, which could limit their applications in many areas where curved surfaces are present. It is there of great interest to develop new generation high performance X-ray scintillators that could be facilely prepared, flexible, and eco-friendly. In this talk, I will present our recent efforts on the development and study of highly efficient eco-friendly X-ray scintillation materials based on organic metal halide hybrids, which exhibit many advantages over conventional X-ray scintillation materials, e.g. (i) facile preparation via wet chemistry at room temperature using low cost rare-earth free raw materials, (ii) tunable visible emissions with near-unity photoluminescence quantum efficiencies, and (iii) higher light yields than most of conventional commercially available scintillators. X-ray imaging tests have shown that these new scintillators provide an excellent visualization tool for X-ray radiography, and high resolution flexible scintillators can be fabricated by blending these materials with appropriate polymers.
In this talk, I will present our recent efforts on the development of new materials and processing approaches to achieve efficient and stable perovskite light emitting diodes (LEDs) with tunable colors. First, surface passivation of metal halide perovskite nanocrystals will be discussed, which could not only reduce surface defects, but also protect the surface from the penetration of degradation agents (e.g. moisture). Second, a novel approach to achieve efficient blue emissions from hollow perovskite nanocrystals via quantum size effects will be introduced. Lastly, processing engineering to prepare metal halide perovskite thin films with desired morphological and electronic properties for LEDs will be discussed.
Here we present our work on development of new solution processable small molecules for efficient organic
photovoltaic cells (OPVs). Boron subphthalocyanine derivatives possess unique structural and photophysical properties,
i.e. excellent solubility, low tendency to aggregate, and high extinction coefficients, that enable the formation of high
quality thin films via solution processing for OPVs application. Both p type (donor) and n type (acceptor) boron
subphthalocyanine derivatives have been investigated. Using a soluble 2-Allylphenol SubPc derivative as donor and
fullerene as acceptor, we have demonstrated simple planar heterojunction OPVs with power conversion efficiencies of
over 1.7%, which represents one of the highest efficiencies for devices with solution processable small molecules to
date. The use of fluorinated subphthalocyanines as acceptor and typical poly[2-methoxy-5-(3',7'-dimethyloctyloxy)-1,
4-phenylene vinylene] (MDMO-PPV) as donor has led to fully solution processed OPVs with efficiencies over 0.1%. Our
work shows that solution processing of light harvesting small molecules has great potential for application in low cost
thin film photovoltaic cells and boron subphthalocyanine derivatives are promising new-generation OPV materials.
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