Researchers make OLEDs brighter by tuning their chirality


Fecha: 12-07-2019

Researchers from the Departments of Physics and Chemistry at Imperial College have managed to control the chemistry of OLED materials so as to control the chirality of the light emitting polymers, hence controlling the polarization of the light output.

Presenting their findings in a paper titled ‘Inverting the Handedness of Circularly Polarized Luminescence from Light-Emitting Polymers Using Film Thickness’ published in ACS Nano, the researchers report that blending achiral polymers with chiral small-molecule additives in the new polymer OLEDs chemistry allowed them to control the handedness/sign of the circularly polarized light through absolute stereochemistry. Another interesting finding is that tuning the circularly polarized light output was performed as a function of the active layer thickness, for a fixed optical isomer of the chiral additive.