1. Guangdong Provincial Key Laboratory of Optical Information Materials and Technology and Institute of Electronic Paper Displays, South China Academy of Advanced Optoelectronics, South China Normal University, Guangzhou 510006, P. R. China.
2. Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, 21 Nanyang Link, Singapore 637371, Singapore.
3. CAS Key Laboratory of Materials for Energy Conversion and State Key Laboratory of High Performance Ceramics and Superfine Microstructures, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, P. R. China.
4. Department of Physics, Chemistry and Biology (IFM), Linköping University, Linköping SE-581 83, Sweden.
5. Centre for Disruptive Photonic Technologies, The Photonics Institute, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore.
6. Energy Research Institute @ NTU (ERI@N), Research Techno Plaza, X-Frontier Block Level 5, 50 Nanyang Drive, Singapore 637553, Singapore.
7. CINTRA CNRS/NTU/Thales, UMI 3288, 50 Nanyang Drive, Singapore 637553, Singapore.
8. Shenzhen Guohua Optoelectronics Technology Co. Ltd., Shenzhen 518110, P. R. China.