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 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.