P.151L: Late‐News Poster: Multi‐Scale Modeling of Organic Light‐Emitting Devices

Abstract

IntroductionModeling is an essential part in research of organic light-emitting devices (OLEDs) and speeds up their development. An accurate model can be used to gain further insight into device operation and for optimizing device performance. Difficulties to simulate state-of-theart commercialized OLEDs arise from the fact that these devices are not only made of an active thin-film layer stack, but also contain thick incoherent layers such as color filters or scattering layers that enhance the light out-coupling efficiency of the device. Moreover, the area of OLED devices for lighting applications can reach several square centimeters and potential losses within electrodes cannot be neglected. For the first time, we present a comprehensive model for OLEDs spanning from microscopic charge transport and exciton dynamics to large-area panels. Our approach is able to simulate the influence of electrical conductivity enhancement in large-area electrodes and light extraction enhancement induced by incoherent scattering layers or interfaces. In a first part of this paper we repeat the fundamentals of the microscopic model, previously implemented in the commercial simulation software SETFOS [1]. In the second part we introduce the macroscopic approach for optical and electrical modeling.

40.4: Design Tool for Light Scattering Enhancement in OLEDs

“…Moreover, this new model is fully integrated into the simulation software SETFOS [4] which simplifies the workflow. We originally developed this scalar scattering approach to compute the light in-coupling into thin film solar cells [5] and we have now extended it to compute the light out-coupling of an OLED [2]. The basic idea is to describe the light intensity distribution between 0° and 90° in each layer for forward and backward light propagation by a vector of dimension D, where D is the number of discrete angles.…”

“…The improvement of light out-coupling requires having simulation tools at hand to efficiently simulate such OLEDs that include light out-coupling enhancement structures. The approach that we have developed [2] is to couple the nano-optical properties of the light emission coming from the recombination of electrons and holes with geometrical optics laws to describe light out-coupling structures. This approach has the advantage to be computationally very efficient and lends itself to optimization of device parameters.…”