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Updated: Mar 2, 2026
Development of Efficient OLEDs from Solution Deposition
Published on: November 4, 2022
Addition of Lithium 8-Quinolate into Polyethylenimine Electron-Injection Layer in OLEDs: Not Only Reducing Driving
Takayuki Chiba1, Yong-Jin Pu1, Takahumi Ide1
1Graduate School of Organic Materials Science, Yamagata University , 4-3-16 Jonan, Yonezawa, Yamagata 992-8510, Japan.
Abstract:
Solution-processed electron injection layers (EILs) comprising lithium 8-quinolate (Liq) and polyethylenimine ethoxylated (PEIE) are highly effective for enhancing electron injection from ZnO to organic layers and improving device lifetime in organic light-emitting devices (OLEDs). Doping of Liq into PEIE further reduces the work function of zinc oxide (ZnO) by enhancing dipole formation. The intermolecular interaction between Liq and PEIE was elucidated by UV-vis absorption measurement and quantum chemical calculation. The OLEDs with ZnO covered with PEIE:Liq mixture exhibited lower driving voltage than that of the device without Liq. Furthermore, as doping concentration of Liq into PEIE increased, the device lifetime and voltage stability during constant current operation was successively improved.
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