Advances in LED understanding: 3 papers on degradation, linkers, and injection

22/07/2022. ONDL scientists explored the science of LEDs(light emitting diodes) in a set of three papers. /n The first studies the degradation mechanism of fluorescent polymer LEDs (PLEDs) mediated by the interaction between triplet excitons and polarons. DOI: 10.1002/aelm.202000367

While impressive preformance has been reported for small-molecule organic LEDs (OLEDs), large-scale device fabrication is limited by its necessary vacuum processing. Sharing our expertise in cross-linking with top groups in Germany and Japan, the team has demonstrated a solution-processable thermally activated delayed fluorescence (TADF) OLED with external quantum efficiencies well beyond 10%. DOI: 10.1002/advs.202200056

The third paper challenges conventional limits of quantum-dot LED (QLED) contacts by introducing ONDL-developed super hole- and electron-injection layers. These solution-processable injection layers are designed to have tunable energy levels to minimise energetic losses in the carriers before recombination, opening a path towards the next generation of ultra-high performance QLEDs featuring double-type-I ideal heterostructures. DOI: 10.1039/D1MH00859E