1. Department of Chemistry & Biochemistry and the Center for Organic Photonics and Electronics, Georgia Institute of Technology, 901 Atlantic Drive NW, Atlanta, GA 30332-0400, USA
2. School of Electrical and Computer Engineering, Center for Organic Photonics and Electronics, Georgia Institute of Technology, 777 Atlantic Drive NW, Atlanta, GA 30332-0250, USA
3. Department of Biology and Chemistry, New Mexico Highlands University, Las Vegas, NM 87701, USA