1. CREOL, The College of Optics and Photonics, University of Central Florida, Orlando, Florida 32826, School of Chemistry and Biochemistry and Center for Organic Photonics and Electronics, Georgia Institute of Technology, Atlanta, Georgia 30332, Institute of Physics, National Academy of Sciences, Kiev, 03028, Ukraine, Institute of Organic Chemistry, National Academy of Sciences, Kiev, 03094, Ukraine, and Department of Chemistry, Chemistry Research Laboratory, University of Oxford, Oxford, OX1 3TA, U.K.