of;
Applied;
Chemistry,;
School;
of;
Science,;
Xi'an;
Jiaotong;
University;
Xi;
'an;
710049,;
China;
Laboratory;
of;
Organic;
Electronics;
and;
Information;
Displays;
Institute;
of;
Advanced;
Materials,;
School;
of;
Electronic;
and;
Information;
Engineering,;
Nanjing;
University;
of;
Posts;
and;
Telecommunications,;
Nanjing;
210036,;
China;
Laboratory;
for;
Physical;
Electronics;
and;
Devices;
of;
the;
Ministry;
of;
Education;
School;
of;
Electronic;
and;
Information;
Engineering,;
Xi'an;
Jiaotong;
University,;
Xi'an;
710049,;
China;