A Hybrid BN-Doped Nanographene with Narrow Emission Bandwidths for OLEDs

Abstract

We describe synthesis of BN-doped nanographene containing five phenylene units, boron and nitrogen atoms with alternating ortho-disposition, as well as direct B−N connections. Resulting BN doped nanographene exhibits blue fluorescence at 441 nm with an extraordinarily narrow fluorescence peak with a full width at half maximum (FWHM)=10–11 nm. Crystallography reveals supramolecular organization of this compound in the crystal phase. Initial organic light emitting device (OLED) data suggest that the presence of a directly connected B−N isostere can lead to devices with sufficiently long lifetime as well as narrow emission electro-luminescence peaks necessary for OLED applications.

Graphical Abstract available at: https://doi.org/10.1002/chem.202404078 Computational screening, synthesis and characterization identified BN-containing candidate 1 as a promising narrow bandwidth chromophore. BN doped nanographene exhibits blue fluorescence at 441 nm with an extraordinarily narrow fluorescence peak with full width at half maximum (FWHM)=10–11 nm that outperforms narrow bandwidths of the incumbent references. Utility of the compound for long lifetime narrow bandwidth OLEDs has also been demonstrated