1. School of Physical Science and Technology & National & Local Joint Engineering Laboratory for Optical Conversion Materials and Technology Lanzhou University Lanzhou 730000 China
2. State Key Laboratory of Applied Organic Chemistry & Key Laboratory of Special Function Materials and Structure Design & College of Chemistry and Chemical Engineering Lanzhou University Lanzhou 730000 China
3. Department of Microelectronic Science and Engineering School of Physical Science and Technology Ningbo University Ningbo 315211 China
4. School of Physics and Electronic Information Engineering Qinghai Normal University Qinghai 810008 China