**6. Acknowledgement**

The work thanks for Prof. Baojun Li from State Key Laboratory of Optoelectronic Materials and Technologies, School of Physics and Engineering, Sun Yat-Sen University, for his guidance. This work was supported by China's National Natural Science Foundation (6117707, 81071790, 11104162), China Postdoctoral Science Foundation Funded Project (201003359), Guangdong Excelent Doctoral Dissertation Funded Project (SYBZZM201126), the Key Project of Chinese Ministry of Education (211131), the Science and Technology Project of Guangzhou Nansha District (RG201001003).

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