Li, Yuan http://orcid.org/0000-0002-4958-6132
Li, Haoyuan
Zhong, Cheng
Sini, Gjergji
Brédas, Jean-Luc
Article History
Received: 6 November 2016
Revised: 21 March 2017
Accepted: 27 March 2017
First Online: 26 September 2017
Competing interests
: The authors declare that they have no competing financial interests.