1. Department of Materials Science and Engineering, Clemson University, Clemson, SC 29634-0971, USA
2. Center for Optical Materials Science and Engineering Technologies (COMSET), Anderson, SC 29625, USA
3. Department of Chemistry, Clemson University, Clemson, SC 29634-0971, USA
4. Department of Bioengineering, Clemson University, Clemson, SC 29634-0971, USA