Abstract
Combination of spin-coating and crosslinking allows low-cost fabrication of large area displays with multiple layers by simple solution processing. For this purpose, a series of novel crosslinkable polymers containing hole-transporting triarylamine units in the main chain were synthesized via palladium-catalyzed C-N-coupling reaction. Additionally, the contain varying amounts of polymerizable oxetane groups as side chains. The polymers were photo-crosslinked to yield absolutely insoluble networks. Thin films were used as hole-transport layer in two-layer blue light-emitting diodes. Absorption spectrum of a films of 8c crosslinked on ITO and cured at 150°C before and after washing with THF. Crosslinking was carried out in bulk with 2 wt.-% of photoacid 4-(thio-phenoxyphenyl)dephenylsulfonium hexafluoroantimonate 18) by irradiation with UV light (>280nm) for 10 s
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