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Control of molecular dye orientation in organic luminescent films by the glass transition temperature of the host material.

We anticipate that our finding will allow the increase of the OLED performance (efficiency and device lifetime), especially because it can directly be correlated to a very fundamental material property, that is, the glass transition temperature. Although the enhancements presented here may seem incremental, it is important to highlight that they can be anticipated to be on top of material development efforts, which are the current driver for progress. Improvements in energy efficiency and durability are of ultimate importance to the further success of the OLED technology in applications such as high brightness displays and solid-state lighting. The concept of incorporating ultrastable glass layers is independent of the emitter technology used so that OLEDs based on either high-performance emitter types, that is, phosphorescence as discussed here and TADF , can equally benefit, if the emitter orientation is not hampered at the respective substrate temperature. Future research needs to investigate material and device properties, which could possibly counteract the observed effects. The influence of the material deposition conditions on the charge carrier transport of organic small molecules must be correlated to solely excitonic effects to achieve a complete understanding. Beyond the OLED technology platform, the formation of organic ultrastable glasses has a high potential to further increase the performance of various organic electronic devices and systems.