Extremely High Efficiency Orange Phosphorescent Organic Light-Emitting Devices

Abstract

We have developed extremely high efficiency orange phosphorescent organic light-emitting diodes based on an orange phosphorescent material, employing the structure of phosphorescent dye-doped hole transporting layer to improve the power efficiency. The device shows a bright orange emission at approximately 564 nm (Commission Internationale d’Eclairage (0.49, 0.50)) and a maximum brightness of 31030 cd/m2 at a driving voltage of 7.6 V. The power efficiency of device has reached 83.56 lm/W at turn-on voltage of 2.2 V. Moreover, this power efficiency has the potential to be raised to 150 lm/W if the light outcouping can be further improved.