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ZnSe/ZnS quantum dots as emitting material in blue QD-LEDs with narrow emission peak and wavelength tunability

: Ippen, C.; Greco, T.; Kim, Y.; Kim, J.; Oh, M.S.; Han, C.J.; Wedel, A.


Organic Electronics 15 (2014), Nr.1, S.126-131
ISSN: 1566-1199
Fraunhofer IAP ()

Quantum dots are a highly attractive class of materials for the use in light-emitting devices, since they allow high color purity, facile tunability and solution-processing methods. Here, zinc selenide QDs are investigated for their suitability as emissive material in cadmium-free blue QD-LEDs. By adjusting the stoichiometry in the synthesis the emission wavelength can be tuned in the range of 390435 nm. For the assembly of the QD-LED, the device setup was adjusted to the low-lying ZnSe valence band energy by choosing a suitable hole-transport material. A first promising QD-LED result is achieved showing the characteristic narrow QD emission peak with a luminance of 25 cd/m².