Estimation of Electron Current in Organic Light-Emitting Diodes Using an Operating Point Model

Abstract

We propose the evaluation approach of the electron current in the bilayer organic light-emitting diode (OLED) using its device current and the hole current of hole transport material. The conduction current whose 50 nm-thick diamine derivative (α-NPD) layer is deposited on a fluorinated self-assembled monolayer (FSAM)-modified indium-tin-oxide (ITO), is presented by the space charge limited current (SCLC) mechanism. When the carrier balance factor is assumed to be a unity with the current continuity law, the electron current of the α-NPD/aluminum quinolone (Alq3) OLED can be evaluated experimentally. In addition, it is suggested that the electron current depends on the hole current from the comparison with the electron current of Alq3 single layer.