A Hybrid BN‐doped nanographene with narrow emission bandwidths for OLEDs

We describe synthesis of BN‐doped nanographene containing five phenylene units, boron and nitrogen atoms with both alternating ortho‐disposition as well as direct B‐N connection. Resulting BN doped nanographene exhibits blue fluorescence at 441 nm with extraordinary narrow fluorescence peak with 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 for OLED applications.