Highly efficient and stable inverted bottom-emission organic light emitting devices

The authors report the development of highly efficient and stable C545T doped green fluorescent $Alq3$ inverted bottom-emission organic light emitting device (OLED), with a device configuration of $ITO∕Mg∕Cs2O:Bphen∕Alq3∕C545T:Alq3∕NPB∕WO3∕Al$⁠, that achieved a maximum current efficiency of $23.7cd∕A$ and a power efficiency of $12.4lm∕W$ which are two times better than those of the conventional OLED. At a brightness level of $100cd∕m2$⁠, the device required driving current density only as low as $0.5mA∕cm2$ at a driving voltage of only $5.0V$ and its half-lifetime $T1∕2$ in excess of $104000h$⁠.