Effect of Phosphorescent and TADF Guests on the Absorption, Emission, and Nanoscale Morphological Properties of Thin Emissive Layer

Effect of thermal annealing on an emissive layer containing a blend of a small molecule and polymer as host for application in OLEDs

“…Thermal annealing treatment has played an important role in easily controlling device performance. 5 The general interpretation of such an annealing effect on a device is that it causes an enhancement in the interfacial bonding between the substrate and the organic layers, which promotes the surface planarity of the organic films. It has been reported that the evaporation of solvent may create empty spaces for the inter-chains to move while thermal annealing at temperatures higher than the glass transition temperature ( T g ) would result in a relaxation of the chains.…”