Speaker: 김창순 교수(융합과학기술대학원)
Date & Time: 2018. 12. 5.(수), 17:00
Where: 융대원 D-122호
Recently, chiral optoelectronics devices, such as chiral light-emitting diodes emitting a circularly polarized light (CPL) with a specific handedness and chiral photodetectors that can detect the handedness of incident CPL, are attracting interest because of their potential applications in chiral molecular sensing, spintronics, displays, and quantum information processing. Organic optoelectronic devices are a promising platform to achieve both high efficiencies and dissymetry factors (g), because molecules possessing structural chirality can be directly incorporated in these devices. However, the characteristics of chiral molecules developed so far are such that there seems to be a fundamental trade-off between g and the efficiency (the luminescence efficiency for emitters and the absorption efficiency (ηabs) for absorbers). In this talk, I will introduce a nanophotonic approach to overcome this trade-off, discussing the design principle of chiral plasmonic nanocavity that serves as a platform for chiral organic photodetectors and organic light-emitting diodes (OLEDs). Our numerical analysis based on chiral eigenmode calculations shows that organic photodetectors with g > 1 and ηabs > 0.3 can be realized even with achiral molecules. Challenges in realizing high performance chiral OLEDs will also be discussed.
Changsoon Kim received the B.S. degree from Seoul National University in 1998, and the M.A. and Ph.D. degrees from Princeton University, Princeton, NJ, USA, in 2000 and 2005, respectively, all in electrical engineering. Before joining SNU in 2009, where he is currently an associate professor in the Graduate School of Convergence Science and Technology, he was at the Department of Electrical and Computer Engineering, Duke University, Durham, NC, USA as research scientist. His research interests include organic optoelectronic devices, nanophotonics, and nanopatterning.