Outcoupling efficiency optimization of phosphorescent and fluorescent based hybrid red, green and blue emitting OLED devices

Abstract

The outcoupling efficiency of a hybrid OLED device with a hole‐injection layer formed by either an organic semiconducting material, namely PEDOT:PSS, or an under‐stoichiometric molybdenum oxide is examined. Because the device is considered for the three primary colour emissions, the active layer is composed of a wide band‐gap blue emitting host polymer doped with either phosphorescent or fluorescent guest emitters. Critical parameters, such as the emission zone profile for the doped active layer with either the organic hole‐injection layer or the inorganic metal oxide, are studied. Contour charts have been derived providing the areas of maximum outcoupling efficiency with the corresponding thickness pairs of the active layer and the hole‐injection layer.

Commercially available chromophores as low-cost efficient electron injection layers for organic light emitting diodes

“…Using an OLED's outcoupling-efficiency calculation method, (e.g. the transmission line method (TLM) [50,51]) the emission point may be estimated, after fitting the corresponding experimentally determined values. An iterative procedure for multiple emission points, and for all wavelengths within the spectrum, may give the final emission zone profile for a particular device.…”