Researchers make OLEDs brighter by tuning their chirality: Page 2 of 2

July 11, 2019 //By Julien Happich
OLEDs chemistry
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.

Microscope images of chiral layers of carbon
based polymers for light emitting diodes.

The implications for OLED displays is important, as typically, over half of the light they emit is blocked by the polarized anti-glare filter fitted onto the screens of smartphones and TVs. Engineering OLEDs with a precisely controlled circularly polarized light output to match the polarization of the anti-glare filter would yield an overall much brighter display or one that would have double the energy efficiency for the same brightness while maintaining a good readability even on a bright sunny day.

While their study was focused on OLEDs for displays, the team anticipates that the new chemistry and the polarised light generated by their materials could also find applications in the storage, transmission and encryption of information through the design of new photonic devices.

Imperial College - www.imperial.ac.uk

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