1. Department of Physics Pukyong National University Busan 608–737 Republic of Korea
2. Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials, Ministry of Education Key Laboratory for the Synthesis and Application of Organic FunctionalMolecules Hubei University Wuhan Hubei 430062 P. R. China
3. Departamento de Física, IUdEA and MALTA‐Consilider Team Universidad de La Laguna Apartado de Correos 456, Cristóbal de La Laguna Santa Cruz de Tenerife E‐38200 San Spain
4. Adam Mickiewicz University Faculty of Chemistry Uniwersytetu Poznańskiego 8 Poznan 61–614 Poland
5. School of Applied Physics and Materials Wuyi University Jiangmen Guangdong 529020 P. R. China
6. Department of Microelectronic Science and Engineering School of Physical Science and Technology Ningbo University Ningbo Zhejiang 315211 P. R. China