1. QD Vision, Inc., Lexington, Massachusetts 02421, USA
2. NanoScience Technology Center, University of Central Florida, Orlando, Florida, 32826, USA
3. Department of Materials Science and Engineering, McMaster University, Hamilton, ON L8S 4L8, Canada
4. Department of Electrical Engineering and Computer Science, Massachusetts Institute of Institute of Technology, Cambridge, Massachusetts 02139, USA
5. Department of Chemistry, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA