Chiral B-N AIEgens: Intense Blue Circularly Polarized Luminescence and Piezochromism.

We present a new class of blue circularly polarized luminescent emitters based on tetraarylaminoborane (TAAB) with considerable dissymmetry factor in the solid state. The chiral pendant 1-phenylethylamine in BN- RR and BN- SS imparts chirality to the core chromophore, resulting in circularly polarized luminescence signals ( g _lum = 0.8 × 10 ^-3 ) with a quantum yield of 33% in the crystalline state. This novel set of compounds also showcases intriguing thermally reversible piezochromism.