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- W2037087860 abstract "Abstract The energy level alignment and chemical reaction at the interface between the hole injection and transport layers in an organic light-emitting diode (OLED) structure has been studied using in-situ X-ray and ultraviolet photoelectron spectroscopy. The hole injection barrier measured by the positions of the highest occupied molecular orbital (HOMO) for N,N′ -bis(1-naphthyl)- N,N′ -diphenyl-1,1 ′ -biphenyl-4,4 ′ -diamine (NPB)/indium tin oxide (ITO) was estimated 1.32 eV, while that with a thin WO 3 layer inserted between the NPB and ITO was significantly lowered to 0.46 eV. This barrier height reduction is followed by a large work function change which is likely due to the formation of new interface dipole. Upon annealing the WO 3 interlayer at 350 °C, the reduction of hole injection barrier height largely disappears. This is attributed to a chemical modification occurring in the WO 3 such as oxygen vacancy formation." @default.
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- W2037087860 date "2009-07-01" @default.
- W2037087860 modified "2023-10-16" @default.
- W2037087860 title "Interface electronic structures of organic light-emitting diodes with WO3 interlayer: A study by photoelectron spectroscopy" @default.
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- W2037087860 doi "https://doi.org/10.1016/j.orgel.2009.02.017" @default.
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