Pure Hydrocarbon Hosts Enabling Efficient Multi-Resonance TADF Blue-Emitting Organic Light-Emitting Diodes.

Pure hydrocarbon (PHC) materials are a class of highly efficient and stable host materials for organic light-emitting diodes (OLEDs), composed solely of carbon and hydrogen atoms. Despite recent great advancements in PHC research, their applications are still mainly limited to phosphorescent OLEDs (PHOLEDs). Thus, expanding PHC materials into other types of OLEDs is critical for advancing organic electronics.

Integration of Through-Space Conjugation of an Adjacent Arene with a Nitrogen/Carbonyl Framework for Narrowband Emission.

Organic luminescent materials featuring noncovalent through-space conjugation (TSC) have attracted considerable attention. However, the presence of multiple vibrational energy levels and weak spatial electron delocalization typically results in broad emission peaks for TSC-based emitters, significantly impeding their extensive application in optoelectronic technologies. Herein, two TSC emitters, TSFQ-TRZ and TSFQ-Ph, were synthesized by integrating a fused nitrogen/carbonyl skeleton with various adjacent arene 2,4,6-triphenyl-1,3,5-triazine (TPTRZ) and phenyl group segments through a rigid spiro spacer.

Efficiency Boost in Through Space Charge Transfer Emitters: Insights from Spiro Lateral Rocking Confinement.

Intramolecular through-space charge-transfer (TSCT) excited states have emerged as promising candidates for thermally activated delayed fluorescence (TADF) emitters. This study addresses the challenges in tuning excited state dynamics through conformational engineering, which significantly impacts exciton utilization. An effective strategy is presented to enhance the performance of TSCT-TADF molecules by restricting the lateral rocking of the spiro unit via immobilizing groups, which indirectly adjusts the conformations of the donor and acceptor subunits.