We prepared a tutorial to summarize the fundamental equations to simulate the electrical behaviour of OLEDs, photodetectors and solar cells. We take as an example the response speed of narrowband organic optical upconversion devices.
Check the full discussion here: https://www.fluxim.com/tutorial-on-drift-diffusion-simulations
Read MoreSetfos can analyze angular-dependent PL data collected by Phelos to get information about the properties of an organic emitter, such as the orientation of the dipoles and the width of the emission zone. With this analysis, we are able to optimize the characteristics of our OLEDs for high EQEs.
Check our description here: https://www.fluxim.com/dipole-orientation-led
Read MoreOLEDs made by thermally-activated delayed fluorescence (TADF) materials as emitters promise an IQE of 100%. Here, we want to present an analysis of the influence of non-radiative recombination rates (knrs and knrt) on the device efficiency as well as how to determine them from experiments. As we will see, the knr rate influences PLQY, and consequently ELQY, hence the negative impact on EQE.
First, to determine the non-radiative decay rates, we need to extract the rates kf, krisc, and kisc by fitting transient photoluminescence (trPL) measurements of TADF films.
Check the full discussion here: https://www.fluxim.com/determining-non-radiative-decay-rates-in-tadf-compounds
Read MoreWe describe a novel simulation approach for excitons in organic light-emitting diodes (OLEDs). We combined a 1D drift-diffusion model with a 3D master equation.
Our approach effectively combines the computational efficiency of a 1D drift-diffusion solver with the physical accuracy of a discrete 3D ME model, where excitonic long-range interactions for energy transfer can be taken into account.
We show that such a hybrid approach can efficiently describe the steady-state and transient behavior of typical OLEDs reported in the literature.
Check the full discussion here: https://www.fluxim.com/oled-with-master-equation-for-excitons
Read MoreWe present a combined experimental/simulation analysis of a set of 4 OLEDs with 2 systematically varied guest dopants in the EML. A numerical electro-optical model is employed, demonstrating one consistent parameter set that describes both steady-state and AC characteristics of all devices. The model accounts for charge transport, trapping, polar layers, and excitonic loss processes. These are inducing an efficiency roll-off that can be correlated with the shape of the emission zone and the guest dopant concentrations. Furthermore, starting from the resulting parameter set, we show routes for optimized TADF OLDEs with a reduced roll-off.
Check the full discussion here: https://www.fluxim.com/tadf-oled-optimization-excitons
Read MoreIn this tutorial, we are demonstrating how to use the optical module of Setfos in order to demonstrate how much the color point of a full OLED can be tuned for a given emitter spectrum. Moreover, we compare the efficiency of the color-optimized device with the one that is tuned for the highest outcoupling/radiance and analyze the consequent trade-off between color purity and efficiency.
The same analysis and optimization can be performed for other types of emitters such as quantum dots or perovskites. Despite the narrow emission spectra of these emitters, the optics of such QLEDs and PeLEDs is equal to the well-established OLEDs.
Check the full discussion here: https://www.fluxim.com/optimization-of-a-blue-oled-cavity
Read MoreDespite the success of OLED displays in commercial products, there are still issues regarding the efficiency and lifetime of these devices. It is of utmost importance to better understand the device physics in general and the origins of degradation in these OLEDs.
In this blog post, we show you an example for which we used our tools Paios and Setfos to understand device limitations and analyze the degradation mechanisms in state-of-the-art sky blue TADF OLED devices.
Read the full post here: https://www.fluxim.com/tadf-oled-degradation
Read MoreThe external quantum efficiency (EQE) is the number of photons emitted by an OLED per number of injected charges. Photons are generated in the device emitting layer (EML), but most of the light is not escaping the device because of thee main loss mechanisms: Total Internal Reflection, Absorption Losses and Surface Plasmon Polaritons (SPPs). In this example, we are showing how to use Setfos to optimize the geometry of an OLED towards high light-outcoupling efficiency.
Read the full post here: https://www.fluxim.com/eqe-oled-optimization
Read MoreFlexible electronics have been envisioned to change the way we interact with technology. Flexible circuit boards are already ubiquitous. These applications of flexible electronics are packaged away inside electrical gadgets and instruments and are therefore not visible to the end user. Nevertheless the development of this technology allowed for tighter packed and therefore smaller and still powerful devices. Curved displays are an application of flexible electronics where the user directly interacts with the shaped object and the technological advancement is directly tangible for the end user.
Read the full post here www.fluxim.com/optimize-micro-textures-for-increased-light-extraction-in-flexible-curved-displays
Read MoreThe simulation software Laoss can be used to quantitatively analyze optical and electrical cross-talk effects in white organic light-emitting diode (WOLED) / color filter (CF) displays. Optical light leakage is found to be highly influenced by the topography of the pixel definition layer (PDL) while it only shows little correlation with OLED parameters, such as the emitter orientation. Electro-optical simulations exemplify the importance of electrical and optical cross-talk to be dominant in different voltage ranges.
Read the full post here: www.fluxim.com/quantifying-electro-optical-cross-talk-in-white-oled-or-color-filter-displays
Read MoreQuantum dots are crystalline semiconductor particles with a size of a few nanometers. The nanocrystal properties are essentially determined by their size.
This blog post will present the main properties of quantum dots and their application. Moreover, it gives an example of how to characterize films with embedded quantum dots using our angular resolved spectrometer Phelos, together with our electro-optical simulation software Setfos.
Check the full discussion here: www.fluxim.com/light-conversion-perovskite-quantum-dots
Read MoreFluorescence‐based organic light‐emitting diodes (OLEDs) using thermally activated delayed fluorescence (TADF) have increasingly attracted attention in research and industry. Even though the experimental realization of this concept has demonstrated promising external quantum efficiencies, the full potential of this approach has not yet been assessed. To this end, a comprehensive electro‐optical device model accounting for the full exciton dynamics, including triplet harvesting and exciton quenching is presented.
Check the full discussion here: https://www.fluxim.com/tadf-oled-simulation
Read MoreFLUXiM is a provider of device simulation software and characterization platforms to the display, lighting, photovoltaics and electronics industries worldwide.
