Green-Emitting Extended B3,N2-Doped Polycyclic Aromatic Hydrocarbon with Multiple Resonance Structure
ORGANIC LETTERS(2024)
Abstract
An air-stable B-3,N-2-PAH (B (3 )N (2 ); nine annulated six-membered rings) was synthesized from 1-X-2,6-di(azasilaanthryl)benzenes (X = Cl, I) via lithiation/borylation, electrophilic aromatic borylation, and Si/B exchange. The heteroatom distribution in B (3 )N (2 ) meets the requirements for multiple resonance thermally activated delayed fluorescence (MR-TADF). Indeed, B (3 )N (2 ) emits green light (lambda(em) = 523 nm; Phi(PL) = 85%; CHCl3) with a small fwhm of 0.15 eV. Lifetimes for prompt (7.8 ns) and delayed (60 mu s) fluorescence were measured in PMMA.
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