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Synergistic Enhancement of Luminescent and Ferroelectric Properties through Multi-Clipping of Tetraphenylethenes

机译：Synergistic Enhancement of Luminescent and Ferroelectric Properties through Multi-Clipping of Tetraphenylethenes

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摘要

Synergistically enhancing luminescent and ferroelectric (SELF) propertiesare observed from a tetraphenylethene (TP) substituted with clipping groups(C), where the C is consisting of a 4-[3,5-bis-(3-decyloxy-styryl)-styryl]-phenyl(DOS) unit. The DOS units of TPCn are self-assembled via intermolecularinteraction to clip themselves and induce TP aggregation, as evidenced byclip-induced quenching of emission at DOS units (E_(clip)) accompanied byaggregation-induced emission enhancement of TPs (E_(AIE)). TPC4 demonstratesstrong photoluminescence in a dilute chloroform solution and large E_(AIE) inaqueous (>50%) THF solution. TPCn demonstrates SELF properties in filmstate, with high quantum yields of photoluminescence (>80%) and ferroelectricswitching. Due to the introduction of four clips, TPC4 has a higherremnant polarization (P_r = 2.27 μC cm~(?2)) at room temperature than TPC1.TPC4 is successfully employed in a light-emitting electrochemical cell toachieve over 1290 cd m~(?2) under pulsed current conditions. The TPC4 film on aflexible substrate produced a piezoelectric output voltage of up to 0.13 V anda current density of 1.14 nA cm~(?2) upon bending. These results indicate thatthe side chain clipping and TP aggregation resulted in unprecedented flexibleSELF properties in a single compound, offering simultaneous enhancement ofelectroluminescence, mechanical sensitivity, and energy harvesting capacity.

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