Triplet-harvesting materials

Thermally activated delayed fluorescent (TADF) emitters are inexpensive and versatile materials for organic light emitting diodes (OLEDs) covering all colour regions. Here, the authors review double boron embedded multi resonant TADF emitters with particular attention to molecular design concepts, synthetic routes, optoelectronic properties, and OLED performance, providing future prospects for display applications.

The process of thermally activated delayed fluorescence (TADF) converts non-radiative triplet states into emissive singlet states. Herein we outline the fundamentals of TADF, some of the recent progress in understanding the key material properties responsible for promoting TADF and finally discuss some remaining challenges for the  potential applications of this phenomenon.

Atomically precise gold nanoclusters display useful photoluminescence properties, but limitations in synthetic methods and characterization techniques have hindered their detailed exploration. Here, a Au₃₈(PET)₂₆ nanocluster is found to exhibit fluorescence, phosphorescence, and thermally activated delayed fluorescence emissions, with a significant enhancement in photoluminescence intensity at cryogenic temperatures owing to the suppression of nonradiative pathways.

Molecules that exhibit multiple resonance thermally activated delayed fluorescence (MR-TADF) are highly efficient electroluminescent materials, but their emission mechanism is still not fully understood. Here, the emission mechanism of a representative MR-TADF molecule is studied through quantum chemistry calculations, with two consecutive decay processes unveiled.

The properties of nano-crystalline materials depend heavily on their size, therefore, understanding early crystallization processes is crucial. Here, the relationship between phosphorescence and crystal structures of three crystallizing Au(I) complexes bearing n-alkyl chains of different lengths is studied.

Organic molecules that exhibit thermally activated delayed fluorescence allow for high efficiencies in OLEDs, but their operational stability remains a challenge to their commercialization. Here the molecular factors that govern the stability of various dyads based on a cycloamino donor–acceptor platform are studied.