We're developing new catalytic methods for the green synthesis of organic molecules using inexpensive photocatalysts and visible light. In our lab, we are particularly interested in visible-light-mediated photo redox catalysis, metal-based radical coupling methods, and the reaction driven by the formation of EDA complexes. Visible-light photocatalysis has emerged as one of the fastest growing fields in organic synthesis to construct variety of carbon-carbon or carbon-heteroatom bonds. Generally, in photo redox catalysis, a photoactive catalyst absorbs the visible light and participates in either single electron transfer (SET) or energy transfer (ET) processes with organic substrates to generate various radical entities under very mild reaction conditions. Through this reactive radical intermediates, unique reactions that are previously inaccessible under thermal conditions can be accessed.