学术动态

报告题目:Carbon nanodots for LEDs and lasers applications

报告人: Yu Siu Fung教授香港理工大学

报告时间:2014612日上午9:00

报告地点:本部现代光学技术研究所三楼会议室

Abstract: Graphite powder is a well-known material commonly used in industries for refractories, steelmaking, brake linings, and lubricants as well as daily consumption such as lead in pencils. The uses of graphite are so vast in our everyday lives; our human activities are next to incapable without the use of graphite. Recently, researchers had discovered that graphite of nanometer sizes (i.e., carbon nanodots or graphene quantum dots) coated with organic passivation exhibits unexpected behavior – intense visible light emission under either optical or electrical excitation at room temperature. In fact, this luminescence behavior of nanostructured carbons can lead to the replacement of phosphor in white-light light-emitting diodes. In addition, the bio-compatibility and bio-absorbability of nanostructured carbons can be applied for bio-sensing and imaging of biological organisms. Nevertheless, the realization of stimulated emission (i.e., lasing) should be the “Holy Grails” of the luminescence nanostructured carbon for their applications in optoelectronics and biological systems. This is because the capability to support lasing emission is an unambiguous verification of high emission efficiency of nanostructured carbons. Hence, in this presentation, the author would like explain how to i) optimize the optical and physical characteristics of nanostructured carbons, ii) to use different approaches to obtain lasing action from the nanostructured carbons and iii) to realize remote carbon-nanodots white-light LEDs. The impact of our effort will not only generate new knowledge in using nanostructured carbon as light-emitting devices, it will also contribute to the development of novel low-cost optoelectronics applications.

Biography: Siu-Fung YU received the Degree of Bachelor of Engineering in Electronic Engineering from LondonUniversity, University College, England, in 1990 and the Degree of Doctor of Philosophy in Optoelectronics Engineering from CambridgeUniversity, Robinson College, England, in 1993. He is now the professor and associate head of the Department of Applied Physics, Polytechnic University of Hong Kong, Hong Kong. His main research interest includes the fundamental study, design and optimization of semiconductor lasers including distributed feedback lasers and vertical cavity surface emitting lasers. He has contributed to the development of computer models to study the dynamic behavior of semiconductor lasers. He also involved in the design and analysis of high power semiconductor pumped lasers. He also led to the design and fabrication of the 'world first' ZnO random laser diode emitted at ultra-violet range. Currently, he was working on the realization of graphene based laser diodes and LEDs for white spotlight applications. He has published over 190 journal papers in ISI journals (i.e., Nature Comm., Adv. Mater., ACS Nano, Angew. Chem. Int. Ed., Small etc.), invited conference and book chapters as well as one book entitled 'Analysis and Design of Vertical Cavity Surface Emitting Lasers', 2003 Wiley, NYUSA. His current H-index is 32 and is a senior IEEE member.


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