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Pressure-Induced Blue-Shifted and Enhanced Emission: A Cooper-ative Effect between Aggregation-Induced Emission and Energy-Transfer Suppression.

Most organic piezochromic materials exhibit red-shifted and quenched emission as pressure increases. However, an ab-normal phenomenon of pressure-induced blue-shifted and enhanced emission is observed in a 9-(3-(1,2,2-triphenylvinyl)phenyl)anthracene crystal, which is based on discrete π-π anthracene (AN) dimer stacking with tetra-phenyl ethylene (TPE) as a spacer. A blue-shifted emission appears and strengthens when pressure is more than 1.23 GPa, and it reaches the maximum when pressure is 4.28 GPa. This phenomenon is ascribed to the cooperative effect be-tween the aggregation-induced emission of TPE units and energy-transfer suppression from TPE to an AN excimer. This work reports a new concept in the piezochromic field and provides a novel strategy to achieve luminescence from a high-lying excited state.