1. School of Information EngineeringGuangdong University of Technology Guangzhou 510006 P. R. China
2. Guangdong Provincial Key Laboratory of Functional Soft Condensed MatterGuangdong University of Technology Guangzhou 510006 China
3. Department of Organic ChemistryUniversity of Chemistry and Technology Prague Technická 5 CZ‐16628 Prague Czech Republic
4. Institute for Solid State Physics and OpticsWigner Research Centre for PhysicsHungarian Academy of Sciences H‐1121 Budapest, Konkoly‐Thege Miklós út 29‐33 Hungary