ur main interest is to develop organic electronic devices and organic materials for organic light-emitting diodes (OLEDs), organic solar cells (OSCs) and organic bistable memory devices (OBDs).

LEDs have been widely studied for display applications and they are now being developed for lighting applications such a backlight for liquid crystal display and a general lighting. Our main focus is to develop white OLEDs, blue phosphorescent OLEDs and soluble phosphorescent OLEDs. Pure white OLEDs for display and warm white OLEDs for lighting are being investigated. In addition, soluble multilayer white OLEDs and hybrid type white OLEDs are also being developed. Our group already achieved the world best current efficiency, excellent color stability, and stable efficiency roll-off in white OLEDs based on our device technology and new organic emitting materials synthesized in our lab.

SCs are one of the research topics and we aims at devising a new device architecture to improve the efficiency of polymer and small molecule dye based OSCs. Various device structures and film coating methods were developed to fabricate high efficiency OSCs. High efficiency OSC materials are also being synthesized using a novel molecular backbone structure which can absorb sunlight effectively. The OSC materials include polymeric light absorbing materials and small molecule dye materials for dye sensitized solar cells.

BDs can replace current Si based memory devices due to the merits of simple structure and low cost fabrication process in addition to non-volatile memory performances. They can be fabricated by combining organic semiconductor materials with metal or inorganic nanoparticles. Our group is interested in creating light-emitting OBDs which can be driven by themselves without any driving circuit using organic nanoparticles as well as metal oxide nanoparticles.

ur group maintains close relationship with many research partners in Korea and abroad, which include university, R&D institute, display industry and organic materials industry. We published more than 40 papers and filed more than 40 patents about organic electronic materials and devices from 2005.

e are always looking for graduate students who are interested in synthesizing materials and fabricating organic electronic devices. If you are interested, please contact me by email ( leej17@dankook.ac.kr ) with the information on your background and records.