Abstract
ABSTRACT Here, we report the synthesis and characterisation of 2,1,3-benzoxadiazole-based (BOX) luminescent liquid crystals with a π-conjugated core and different elongated donor units connected by triple bonds. These molecules exhibited calamitic thermotropic mesomorphism with nematic and smectic phases and intense photoluminescence under UV–vis light excitation in solutions and films. In solution, the emission revealed a maximum in the yellow region (502 to 590 nm), similar to that of benzothiadiazoles (BTD) homologous, but with fluorescence quantum, it yields significantly higher (ΦPL = 0.30–54). The nature of donor unit substantially influenced the quantum yields and excited state lifetimes. Solvatochromism studies showed a dependence of the emission, quantum yield and lifetimes with the polarity of the solvent. This work demonstrates that 2,1,3-benzoxadiazole core derivatives have thermal and photophysical properties similar to BTDs but with superior quantum efficiency.
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