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Organic LEDs are light emitting diodes (LEDs) that use polymers or small organic molecules as their optically active element. Development of organic LEDs is driven in particular by its potential as a display technology. Organic LEDs can be fabricated on flexible substrates, unlike their rigid inorganic counterparts.
Narrowband deep-blue organic light-emitting diodes combining high colour purity, efficiency and stability are realized by using multiresonance thermally activated delayed fluorescence emitters with a highly twisted helical structure.
Elastic-microphase-engineering and dual-embedded electrodes enable intrinsically stretchable OLEDs with record brightness (33,443 cd/m²) and stretchability (120%).
Organic light-emitting materials with narrow emission bands still struggle with difficult synthesis and performance losses from aggregation and slow spin conversion. The authors design a boron–nitrogen–boron molecular framework that improves spin interactions, limits aggregation, and yields efficient, narrow emission.
Super-resolution imaging of organic light-emitting diodes reveals that their electroluminescence emission is spatially non-uniform and blinking when observed at the submicrometre length scale.
A nanostencil lithography technique enables fabricating arrays of green-emitting OLEDs with pixels as small as 100 nm and an external quantum efficiency of 13.1%.
A designed electron transport layer paired with an embrittled aluminium cathode sustains efficient electron injection under strain, resulting in largely enhanced light-emitting performance.
A simple physical model based on electronic interactions between excited configurations enables the quick and reliable prediction of singlet–triplet energy gaps in polycyclic heteroaromatic emitters. Guided by this model, organic emitters with small singlet–triplet energy gaps can be designed for applications in organic light-emitting diodes with high efficiency and colour purity.
Intrinsically polarized white-light emission is highly demanded for many applications. It is now possible to realize it via a bimolecular doping strategy of organic semiconductor single crystals, overcoming long-standing limitations in organic emitters.
