演讲嘉宾-W. Strek

W. Strek
波兰科学院低温与结构研究所
Prof. Wiesław Stręk, graduated in physics from the Adam Mickiewicz University in 1971. Since 1971 he has been working at the Institute of Low Temperature and Structure Research, PAS, in Wrocław. He was awarded the PhD degree in 1979. He heads the Institute’s Departament of Spectroscopy of Excited States which researches luminescent materials, nonlinear optics, biophysics, sol gel technology and nanotechnology. He has authored or co-authored over 400 publications (over 3000 quotes, Hirsh index Hirscha-23), 15 patents and patent applications. He has pursued many scientific internships in Denmark, France, Germany, Finland, Brazil, USA, Israel. He lectured at numerous Polish and international conferences (over 100 lectures) and has acted as a visiting professor (Israel, Denmark, France, Brazil). He has organized and co-organized many (over 30) Polish and international conferences, e.g. Rare Earth Spectroscopy, Excited States of Transition Elements, Intl Conf. on f-Elements, Intl Workshop Structure&Spectroscopy of Rare Earths, Conference on Luminescence, So-Gel Materials, Rare Earth Materials. He has advised on 7 PhD theses.
The scope of his research activities encompasses optical properties of rare earth compounds and transition metals, electron relaxation theory (radiative, non-radial transitions, cooperative reactions), laser spectroscopy, optical sensor and biosensors, laser materials, photodynamic therapy, technologies of luminescent materials (nanophosphors), transparent ceramics, porous thermoinsulation materials, nanoceramic materials for fuel cells, criotherapy, Rare earth ions and transition metal ions doped solgel materials, photonic structures, nanomaterials, nanoceramics and crystals.
演讲题目:Application of laser induced emission from graphene foam for white lighting
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内容摘要

The intense white light emission is reported for graphene foam in vacuum upon irradiation with cw infrared laser diode. It strongly depends on excitation laser density. The lighting is accompanied by efficient photocurrent and electron emissions. The laser induced white light emission is the nonlinear process characterized by threshold behavior, exponentially scaled by the excitation power density. The order of scaling decreases with excitation density. The white lighting was investigated for different excitation wavelengths.  It was found the lighting threshold decreased with decreasing excitation wavelength. The effect of applied voltage on intensity of white lighting was investigated. The light intensity may be tuned with applied voltage. The bias effect suggests the possibility for designing new photoconvertors  working as electric generators and  phototransistors.  Applications of LIWE of graphene foam for sustained white lighting sources are presented. 

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