Huaixin Wei, Qingdong Ou, Zheng Zhang
Mar 1, 2013
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Influential Citations
14
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Journal
Organic Electronics
Abstract
Abstract We report on the role of cesium fluoride (CsF) doping on the enhanced electron transport properties of tris-(8-hydroxyquinolin) aluminum (Alq 3 ) for organic light-emitting diodes. The electronic structures of CsF-doped Alq 3 layers with various doping concentration are characterized by in situ ultraviolet and X-ray photoelectron spectroscopies, showing an n-type electrical doping effect with Fermi level shift towards unoccupied molecular orbital and the formation of chemistry-induced gap-states. The increase in conductivity and reduction in electron injection barrier in CsF-doped Alq 3 layer with optimal doping concentration lead to the enhanced electron injection and transport, which are consistent with the improved electrical characteristics of OLEDs.