Engineering;
Centre;
for;
Flat-panel;
Displays;
&;
Solid-state;
Lighting;
and;
College;
of;
Materials;
Science;
&;
Engineering,;
Nanjing;
University;
of;
Posts;
&;
Telecommunications,;
Nanjing;
210046,;
China;
Laboratories;
for;
Organic;
Electronics;
&;
Information;
Displays;
(KLOEID);
and;
Institute;
of;
Advanced;
Materials;
(IAM),;
Nanjing;
University;
of;
Posts;
&;
Telecommunications,;
Nanjing;
210046,;
China;
of;
Science,;
Nanjing;
University;
of;
Posts;
&;
Telecommunications,;
Nanjing;
210046,;
China;