Figure 3From: Effect of triplet multiple quantum well structures on the performance of blue phosphorescent organic light-emitting diodesElectrical characteristics of blue PHOLEDs. The luminance versus voltage characteristics (inset: current density versus voltage characteristics) of devices A, B, C, and D. The dotted circle on the graph shows reduction in the turn-on voltage from 3.5 V of the reference device (device A) to 2.5 V of the MQW structure device (device D).Back to article page