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• W2116898237 abstract "Abstract Over the past years, organic light-emitting diodes (OLEDs) have attracted increasing interest because of their great potential for use in high-quality flat-panel displays and solid-state lighting. One of the basic requirements in any emissive device is to provide adequate stability to ensure a sufficiently long lifetime. Recently, it was observed that small molecules migrate toward the ITO anode under a direct driving voltage while retaining their original structures. To prevent this bias-driven migration of small molecules, a chemical structure with a higher steric hindrance could be introduced as a blockade, thus molecular migration could be suppressed and the device half-life increased. In this work, OLED devices with different hosts, including CBP, mCP, SimCP2, and SimCP, with increasing steric hindrances are fabricated. The spatial distribution of the tracking molecules after operation for different lengths of time is examined by using X-ray photoelectron spectroscopy (XPS) with in situ high-energy C 60 + and low-energy Ar+ co-sputtering for depth profiling. It is found that the bias-driven molecular migration is suppressed and the device half-life prolonged as the steric hindrance of the host increases." @default.
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• W2116898237 date "2011-02-01" @default.
• W2116898237 modified "2023-10-18" @default.
• W2116898237 title "Molecular migration behaviors in organic light-emitting diodes with different host structures" @default.
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• W2116898237 doi "https://doi.org/10.1016/j.orgel.2010.12.005" @default.
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