Enhancement of Circularly Polarized Luminescence from Pulsating Nanotubules

Enhancing the dissymmetry factor (glum) is a crucial issue in developing circularly polarized luminescence (CPL) materials. Herein, based on supramolecular self-assembly of diethyl l-glutamate-cyanodiarylethene (L-GC) in mixed solution of EtOH-H2O with different water fraction, enhanced circularly polarized emission from pulsating nanotubules is realized. In the mixture of ethanol and water (30/70, v/v), L-GC self-assembles into roll-up-type dense nanotubes and shows l-CPL. Remarkably, by increasing the water fraction to 80% and 90%, the diameter of the roll-up nanotubes increases and the dissymmetry factor of the nanotubes is significantly enhanced from 6.9 x 10-3 (dense nanotubes) to 3.7 x 10-2 (loose nanotubes) because of the enhanced intermolecular interactions and more ordered supramolecular stacking when increasing the water fraction. An efficient way is provided here to realize the increase of the dissymmetry factor by only changing the composition of solvents. Herein, based on supramolecular self-assembly of diethyl l-glutamate-cyanodiarylethene in mixed solution of EtOH-H2O with different water fraction, enhanced circularly polarized emission from pulsating nanotubules is realized. Thus the morphological dependence of emissive nanostructures on circularly polarized luminescence activity can lead to controlled modulation of chiroptical properties, offering great potential for fabricating chiroptical organic nanomaterials.image

Automated summary

Enhanced circularly polarized emission can be achieved by increasing the dissymmetry factor of luminous nanostructures through changing the solvent composition. This has great significance for the fabrication of chiroptical organic nanomaterials.