Synergetic ferroelectric luminescent (SFL) materials comprising a central tetraphenylethene (TP) core were synthesized by attaching TP with clipping groups (C), where clipping groups consist of a self-assembling group (SAG). TPCns selfassembled by the intermolecular interaction of SAGs to induce TP aggregation, as evidenced by the clip-induced quenching of emission at SAGs (Eclip) accompanied by aggregation-induced emission enhancement of TPs (EAIE). TPC4 showed strong photoluminescence in a dilute chloroform solution and large EAIE in aqueous (<50%) THF solution. TPCn film showed SFL properties with high quantum yield of photoluminescence (<80%) and ferroelectric switching. TPC4 was successfully employed in light emitting electrochemical cells (LECs) to achieve high luminance above 1290 cd m−2 under pulsed current conditions. TPC4 had a higher remnant polarization (Pr = 2.27 μC cm−2) at room temperature than TPC1. The thin film of TPCn was stable even with repeated bending due to the flexible SAG with long alkyl chains. Therefore, the SFL of TPCn was effectively employed in a piezoelectric nanogenerator, which produced piezoelectric output voltage of up to 0.13 V and a current density of 1.14 nA cm−2 under repeated concave bending. These results indicate that side chain clipping and central TP aggregation resulted in unprecedented flexible SFL properties in a single compound, which simultaneously enhanced electroluminescence, mechanical sensitivity and energy harvesting ability.
Here, we present two examples of strategies we have recently developed to elaborate ‘graphen-dye’ emitting platforms.
In the first example, graphene and an emitting 3D building block are combined to obtain a light emitting graphene-based hybrid 2D system. We report the first fluorescent molecular self-assembly on graphene. The quenching of the fluorescence of the adsorbed dye by the adjacent graphene is hindered at the molecular scale based on a spacer approach, through a specifically designed dual-functionalized self-assembling building block. The resulting optical properties of the whole graphene−dye hybrid system are characterized by absorption and fluorescence spectroscopies.
The second example deals with surface-confined host–guest chemistry in order to trap a functional 3D building block (3D Zn-Phthalocyanine complex) into a large 2D nanoporous template. Results on graphene with a 3D functional complex incorporating an emitter will be presented.
The actuator is implemented based on the conductive polymer layer which causes photothermal conversion through the light in the near infrared region. The photothermally induced heat from conducting polymer can be converted into other type of energy such as mechanical, electrical or chemical energy. Especially, photothermal energy conversion into mechanical energy gives a unique method for reversible change of multi-layered actuator from 2-dimensional to 3-dimensional structure by thermal expansion coefficient mismatch among the layers. Herein we present the effect of the layer composition on the photoactuation and demonstrate a light switchable photothermal sensor.
Highly ordered iron incorporated mesoporous silica (Fe-SBA15) was prepared and used as a template for catalytic
polymerization of functional molecules. The mesoporous catalysts were used as an oxidative nano-reactor in
heterogeneous catalytic reactions to afford highly fluorescent poly(methylene anthracene)s (PMAn) when anthracene
was used as a monomer. The structure of the mesoporous Fe-SBA15 was 2D channel with large surface area of 710 m2/g
and pore size of 9.2 nm. The fluorescent polymer was synthesized with high yield of 90 % in short reaction time. The
synthesized polymer PMAn showed good emission properties with high excimer emission, which was highly affected by
the pore size of the reactor. This indicated that the optical properties of fluorescent polymers synthesized from this
method could be controlled by the pore size of the mesoporous templates.
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