Morphology of contact printed colloidal quantum dots in organic semiconductor films: Implications for QD-LEDs

TitleMorphology of contact printed colloidal quantum dots in organic semiconductor films: Implications for QD-LEDs
Publication TypeBook Chapter
Year of Publication2011
AuthorsAidala, KE, Panzer, MJ, Anikeeva, PO, Halpert, JE, Bawendi, MG, Bulovic, V
EditorSingh, J
Book TitlePhysica Status Solidi C: Current Topics in Solid State Physics, Vol 8,
Volume8
Abstract

Quantum dot light emitting devices (QD-LEDs) consist of a monolayer of QDs sandwiched between a hole transporting layer (HTL) and electron transporting layer (ETL) of organic materials. These hybrid devices emit with the narrow bandwidth characteristic of the QDs. The precise position of the QD layer, relative to the interface between the ETL and HTL, can affect the quantum efficiency of the device on the scale of 10 nm or less. Motivated by this observation, the exact nature of the morphology of contact printed and self-assembled QDs on typical organic materials is investigated. The QDs are substantially pressed into the organic material, to a somewhat greater extent when contact printed compared to self-assembled structures. Measured device characteristics from samples made with the two methods are consistent with these observations. (C) 2010 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim