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    Prolonged Lifetime in Nanocrystal Light-Emitting Diodes Incorporating MoS2-Based Conjugated Polyelectrolyte Interfacial Layer as an Alternative to PEDOT:PSS

    Year: 2020

    Journal: ACS Appl. Electron. Mater., Volume 2, MAY 26, page 1186–1192

    Authors: Lagonegro, Paola; Martella, Christian; Squeo, Benedetta M.; Carulli, Francesco; Scavia, Guido; Lamperti, Alessio; Galeotti, Francesco; Dubertret, Benoit; Pasini, Mariacecilia; Brovelli, Sergio; Molle, Alessandro; Giovanella, Umberto

    Organizations: ACCORDO QUADRO Regione Lombardia project [decreto 7784/2016]

    Keywords: dichalcogenides; colloidal nanoplatelets; light-emitting devices; interfacial layers; conjugated polyelectrolytes

    Colloidal semiconductor nanocrystals (NCs) and, recently, nanoplatelets (NPLs), owing to their efficient and narrow-band luminescence, are considered as frontier materials for light-emitting diode (LED) technology. NC-LEDs typically incorporate interfacial layers as charge regulators to ensure charge balancing and high performance. In this Letter, we show the prolongation of the lifetime of multilayer solution-processed NC-LEDs by combining a self-doped conductive conjugated polyelectrolyte and exfoliated molybdenum disulfide (MoS2) flakes as an alternative to PEDOT:PSS. The ink features a neutral pH and a tunable hydrophobicity that mainly results in a remarkable stability of LEDs, using CdSe/CdZnS NPLs.
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