Electron injection in inverted organic light-emitting diodes with poly(ethyleneimine) electron injection layers

Add time:08/09/2019    Source:sciencedirect.com

Electron-injection mechanisms from the air-stable metal-oxide cathode to light-emitting polymer layer are studied. The device configuration is aluminum (Al) doped zinc oxide (AZO)/Poly(ethyleneimine) (cas 106899-94-9) (PEI)/poly(9,9-dioctylfluorene-alt-benzothiadiazole) (F8BT)/molybdenum trioxide/Al, known as an inverted organic light-emitting diode (iOLED). PEI reduces the electron injection barrier between AZO and F8BT by 0.4 eV, and blocks holes at AZO(PEI)/F8BT interface in iOLEDs. The accumulation of holes at the interface greatly enhances the electron injection because of the Fowler-Nordheim type tunneling injection, leading to high current efficiency of iOLEDs.

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