报告题目：Organic-Inorganic Hybrid Materials Based on Quantum Dots for Optoelectronic Applications

报 告 人：Prof. Kwang-Sup Lee

Department of Advanced Materials, Hannam University

主 持 人：孙洪波 教授

报告时间：2015年5月25日10:00-11:00

报告地点：唐敖庆楼D314报告厅

主办单位：电子科学与工程学院

集成光电子学国家重点联合实验室

Research Areas :

- Polymers and Organic-Inorganic Hybrid Materials for Electronic and Photonic Applications (Nonlinear Optics, Two-Photon Absorption, Organic Light Emitting Diodes, Photovoltaics, Organic Field-Effect-Transistors)

- Exotic Materials for Biophotonics and Nanophotonics

- Design and Synthesis of Liquid Crystalline Polymers

Abstract: Quantum dots (QDs) with semiconducting charcteristics are of an increasing importance in the fundamental studies and in a wide range of

technological applications such as light emitting devices, photovoltaics, lasers or fluorescent labels. Tacking the full potential of QDs in optoelectronic devices require efficient mechanisms for transfer of energy or electrons produced in the optically excited QDs. We propose semiconducting π-conjugated molecules as ligands to achieve energy or charge transfer. The hybridization of p-type π-conjugated molecules to the surface of n-type QDs can induce distinct luminescence and charge transport characteristics due to energy and/or charge transfer effects. QDs and π-conjugated molecule hybrids with controlled luminescent properties can be used for new active materials for light-emitting diodes in flexible displays. In addition, such hybrid systems with enhanced charge transfer efficiency can be used for nanoscale photovoltaic devices. Single molecule-based electronics using QDs and π-conjugated molecule hybrids with molecular-scale n–p or n-insulating (ins)–p heterojunction structures are new promising building blocks for nanoscale electronics and quantum device concepts. The charge transfer and energy transfer efficiencies between the n-type QD and p-type π-conjugated molecules depends on the degree of their spatial proximity and spectral overlap respectively. Along these lines, we designed and synthesized hybrid nanoparticles consisting of a CdSe/ZnS QD as a core and π-conjugated polythiophenes as well as carbazole as a shell. The nanoscale PL and molecular optoelectronic properties of hybrids consisting of QDs and π-conjugated molecules could be tuned by their relative distance and the degree of spectral overlap. The novel properties of hybrids consisting of QDs attached to π-conjugated organic molecules can be used new scientific and application fields for molecular electronics and optoelectronics, including luminescent displays and energy harvesting cells.