Figure 3.

Electrical 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).

Lee et al. Nanoscale Research Letters 2012 7:23   doi:10.1186/1556-276X-7-23
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