Liu, Xiao-Ke http://orcid.org/0000-0001-5661-8174
Xu, Weidong http://orcid.org/0000-0002-0767-3086
Bai, Sai http://orcid.org/0000-0001-7623-686X
Jin, Yizheng http://orcid.org/0000-0002-2485-0064
Wang, Jianpu http://orcid.org/0000-0002-2158-8689
Friend, Richard H. http://orcid.org/0000-0001-6565-6308
Gao, Feng http://orcid.org/0000-0002-2582-1740
Article History
Received: 12 December 2019
Accepted: 24 July 2020
First Online: 14 September 2020
Competing interests
: R.H.F. is a director of Helio Display Materials Ltd. The other authors declare no competing interests.