Abstract
Organoboroncompounds offeranew strategy to design optoelectronic materials with high fluorescence efficiency. In this paper,theorganoboron compound B-BNBP with double B←N bridged bipyridine bearing four fluorine atoms as core unit is facilely synthesized and exhibitsanarrowbandemission spectrum and a high photoluminescence quantum yield(PLQY)of 86.53% in solution. Its polymorphiccrystalswere controllable prepared by different solution self-assembly methods. Two microcrystals possess different molecular packing modes, one-dimensional microstrips (1D-MSs) for H-aggregation and two-dimensional microdisks (2D-MDs) for J-aggregation, owing toabundant intermolecular interactions of four fluorine atoms sticking out conjugated plane. Their structure-property relationships were investigated by crystallographic analysis and theoretical calculation. Strong emission spectra with the full width at half maximum (FWHM)of less than 30nm can alsobeobserved in thin film and 2D-MDs. 1D-MSs possess thermally activated delayed fluorescence (TADF)property and exhibit superior optical waveguide performance with an optical loss of 0.061 dB/μm. This work enriches the diversity of polymorphic microcrystalsand further reveals the structure-property relationship in organoboronmicro/nano-crystals.
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