1. Guangdong University Key Laboratory for Advanced Quantum Dot Displays and Lighting Department of Electrical & Electronic Engineering Southern University of Science and Technology Shenzhen 518055 P. R. China
2. Department of Chemistry Southern University of Science and Technology Shenzhen 518055 P. R. China
3. Department of Materials Science and Engineering Monash University Clayton Victoria 3800 Australia
4. Center for Materials Science Queensland University of Technology Brisbane Queensland 4000 Australia