Preparation of Patterned and Multilayer Thin Films for Organic Electronics via Oxygen‐Tolerant SI‐PET‐RAFT

Abstract

AbstractAn oxygen‐tolerant approach is described for preparing surface‐tethered polymer films of organic semiconductors directly from electrode substrates using polymer brush photolithography. A photoinduced electron transfer‐reversible addition‐fragmentation chain transfer (PET‐RAFT) approach was used to prepare multiblock polymer architectures with the structures of multi‐layer organic light‐emitting diodes (OLEDs), including electron‐transport, emissive, and hole‐transport layers. The preparation of thermally activated delayed fluorescence (TADF) and thermally assisted fluorescence (TAF) trilayer OLED architectures are described. By using direct photomasking as well as a digital micromirror device, we also show that the surface‐initiated (SI)‐PET‐RAFT approach allows for enhanced control over layer thickness, and spatial resolution in polymer brush patterning at low cost.