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Orthogonal Solution-Processable Electron Transport Layers Based on Phenylpyridine Side-Chain Polystyrenes
This article reports
the synthesis and characterization of a series of polystyrenes containing
phenylpyridine moieties as side chains. Methanol solubility of these
polymers is induced if the relative pyridine content of the overall
aromatic units of the side chains is larger than 0.5. This allows
for orthogonal processing of multilayered organic light emitting diode
(OLED) stacks fabricated from solutions. The polymers show high thermal
stability due to their glass-transition temperatures ranging from
136 up to 247 °C. High triplet energies of up to 2.8 eV are obtained
by combination of the side-chain aromatic rings in the meta position.
The use of the methanol soluble side-chain polymers as an electron
transport layer (ETL) is demonstrated in an orthogonally processed
three-layer green-emitting OLED stack. When depositing the ETL from
methanol, redissolution of the underlying emission layer does not
occur