Influence of electrical doping on performances of white emitting organic light emitting diode

International audienc

Inkjet deposition of a hole-transporting small molecule to realize a hybrid solution-evaporation green top-emitting OLED

The QUPD molecule has been deposited by inkjet printing as a hole-transport layer in top-emitting green OLEDs. A systematic study of the QUPD-based ink formulation has been done and different solvent mixtures have been investigated, in order to find the best composition (QUPD in toluene/IPA/anisole, 8/1/1 v/v/v) leading to the best film forming properties. Spin-coated PEDOT-PSS has been used as hole injecting layer. Subsequent layers have been deposited by vacuum sublimation. The resulting hybrid, solution-sublimation, OLEDs have been encapsulated by atomic layer deposition using Al2O3 material. In order to overcome the issue related to the thickness control of the organic layers deposited from solution, second order cavity length OLEDs have been fabricated by modifying the n-doped electron transport layer thickness. In that case, the relative OLED efficiency variation (10.5%) due to the thickness variation is far less compared to first order cavity length (34%) allowing a better reproducibility of the OLED fabrication. In the end, high efficiency (18 lm/W) green OLEDs of two different sizes, 0.44 cm(2) and 4 cm(2), have been fabricated, using an inkjet printed QUPD layer as hole transporting layer. (C) 2017 Elsevier B.V. All rights reserved

Reliability of the extrapolated OLED lifetime from stretched exponential decay fit diode

International audienc

Speeding up the unique assets of atomic layer deposition

International audienc

Speeding up the unique assets of atomic layer deposition

International audienc

Al2O3, Al doped ZnO and SnO2 encapsulation of randomly oriented ZnO nanowire networks for high performance and stable electrical devices

International audienc

Synthesis of poly(arylene ether)s containing hole-transport moieties from an isocyanate masked bisphenol

NRC publication: Ye

Organic light emitting diodes using an aryl-substituted isobenzofurane as electron transport material

NRC publication: Ye