Abstract
Detailed transient current response characteristics under pulsed voltage in MoO3-based organic light-emitting diodes (OLEDs) are first investigated. The transient current can be divided into three parts: positive current spike (IP), steady-state current (IS), and negative current spike (IN). It is found that IS is the operating current of OLED devices. IP and IN show a linear relationship with pulsed voltage amplitude. Higher IN than IP is induced by the difference of anode Fermi level and highest occupied molecular orbital (HOMO) of NPB. We also derive an expression for duty ratio with space charges. Results show that IP and IN correspond to the charging and discharging processes of space charge, respectively. The current spikes and threshold duty ratio are found only to be affected by the injection barrier and independent of internal device structure.
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