High performance organic polymer light-emitting heterostructure devices

Abstract

We report a high performance electroluminescence device based on bi-layer conjugated polymer structures consisting of a hole transporting (amine-fluorene) and an emissive (benzothiadiazole-fluorene) polymer layers prepared by the spin-coating technique on the glass substrate. Devices showed green emission with an electroluminescence peak located at around 545 nm and a full width at half maximum of about 80 nm. Our devices have also shown a high brightness $\text{(∼10\hspace{0.05em}000}$ ${\mathrm{cd/m}}^{\mathrm{2}}$ at 0.84 ${\mathrm{mA/mm}}^{\mathrm{2}}\mathrm{),}$ good emission efficiency $\text{(∼14.5}$ cd/A) and luminous efficiency (2.26 lm/W), a large external quantum efficiency (3.8%), and a reasonable forward-to-reverse bias current rectification ratio ${\text{(>10}}^{\mathrm{3}}$ at $\text{±25}$ V).