Atomically-thin red-emitting LED scales across large areas: Page 2 of 2

August 20, 2019 //By Julien Happich
Atomically-thin LED
Researchers at the Duisburg-Essen University have leveraged the direct bandgap of atomically thin transition metal dichalcogenides (here WS2) to design low-power red emitting LEDs which they say could be designed as large area emitters.

The paper also reports that operating the LED in pulsed electroluminescent mode reduces heat dissipation, enhancing the device efficiency by a factor of almost 4.

Glass coated with indium tin oxide (ITO) is used as the anode material, with poly(3,4-ethylenedioxythiophene):poly-(styrenesulfonate) (PEDOT:PSS) as a hole injection layer, and poly[N,N′-bis(butylphenyl)-N,N-bis(phenyl)benzidine] (poly-TPD) as organic hole transport layer. On the cathode side, a ZnO quantum dot (ZnO-QD) layer serves as the electron injection layer on an aluminium cathode.

Universität Duisburg-Essen - www.uni-due.de

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