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вторник, 27 марта 2018 г.

Making monitors brighter: Controlling the color of…


Making monitors brighter: Controlling the color of OLEDs



Organic light-emitting diodes (OLEDs) are used in smartphones and televisions to facilitate the high-contrast display of colours. Conjugated polymers are also often employed as organic semiconductors in such diodes. Researchers at the University of Bayreuth have found out how the spatial structure of these polymers can be used to control the colours of the OLEDs and help to increase the brightness of monitors. They have now presented this previously unknown mechanism in the scientific journal PNAS.


Polymers with a backbone: spatial structures determine the colour of light


Polymers that are well-suited for use in organic light-emitting diodes play a central role in the new research findings. Thanks to the chain formed by connecting molecular building blocks, they possess a backbone. If the polymers are then exposed to a laser beam, they absorb the light and store it as excitation energy. This energy spreads along the backbone. Shortly after that, it is released by emission of light.



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