AMADEus Seminar - Prof. Jun Gao - Thursday 14 November 2013, 16:00 pm - Amphi 2, ENSCBP
Prof. Jun Gao, Department of Physics, Engineering Physics and Astronomy Queen's University, Kingston, Ontario, Canada
Portraits of polymer light-emitting electrochemical cell
Abstract
In this talk I will share with you many beautiful images of polymer light-emitting electrochemical cells (LECs). An LEC is a simple two-terminal device with an active polymer layer and two metal electrodes invented by Q. Pei et al. in 1995. However, the operating mechanism of the LEC is very complex and even a subject of debate due to the interplay of ionic and electronic charges. To gain insight into the inner workings of LECs, we relied heavily on various visualization and scanning probe techniques. This was made possible by making the LEC in a surface or planar configuration with a very large separation (millimeters) between the electrodes. I will present results from time-lapse fluorescence and electroluminescence imaging, direct contact probing and optical beam induced current imaging of the extremely large surface cells. The results depict a coherent picture of the fundamental operating mechanism of the LEC.
Bio
Jun Gao obtained his PhD in Materials from UCSB under the supervision of Prof. Alan Heeger in 1999. He then did postdoctoral research in the Department of Chemistry and Biochemistry at UCSD under the supervision of Prof. Michael Sailor. He has been a faculty member at Queen's University since 2002. His main research interests are polymer based light-emitting devices and photovoltaic cells.