Abstract
In order to improve mobility, we can blend linear HTM (hole transfer material) with high mobility polymer to crosslinked polymer prepared as a semi‐IPN (inter‐penetrating network) form to realize highly efficient solution processed OLEDs. However, we cannot ensure a reproducibility of the devices because a non‐crosslinked linear polymer, poly(9,9‐dioctylfluorene‐co‐N‐(4‐butylphenyl)di‐phenylamine) (TFB) or poly(N,N′‐bis‐4‐butylphenyl‐ N,N′‐bisphenyl)benzidine (poly‐TPD) could be still miscible with emitting layer (EML) at their successive wet processes. To overcome this problem, we attempted to eliminate intermixing by crosslinking organic soluble linear HTM polymers by adding a nitrene type photo‐crosslinking agent inside the HTM solution.
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