Soluble processed low-voltage and high efficiency blue phosphorescent organic light-emitting devices using small molecule host systems

► Solution processed high efficiency blue phosphorescent OLEDs. ► Real low driving voltage of 5.4 V with 14.6 % EQE. ► Small molecule mixed host system exhibits good device performances. ► Almost no charge trapping mechanism of the emissive layer. ► Good surface morphology of solution processed films.