Stacks of potential: A cross-linkable host–guest system for state-of-the-art multi-layer device stacks is developed. The spirobifluorene-based host materials were co-cross-linked with green emitting phosphorescent (fac)-IrIII complexes. As a result a five-layered organic light-emitting diode (OLED) could be fabricated in which each organic layer has been deposited from solution.
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