New Papers Published from LED and Solar Cell Researchers
Since our last newsletter, there’s been a flurry of high-impact papers published on LEDs and Solar Cells. So we’re always super excited to read how researchers are deploying our simulation software and measurement tools.
These new papers add to over 250 publications that have used our simulation software Setfos and Laoss and our measurement platforms Paios, Phelos, Litos, and Litos Lite. We would like to thank all our colleagues in research for their continued trust in our tools.
Here are a few highlights from the past quarter:
Organic Light-Emitting Diodes (OLEDs)
Stable pure-blue hyperfluorescence organic light-emitting diodes with high-efficiency and narrow emission
Chan, CY., Tanaka, M., Lee, YT. et al.; Nat. Photonics 15, 203–207 (2021): (https://doi.org/10.1038/s41566-020-00745-z)
Organic light-emitting diodes (OLEDs) are used in high-class displays for a number of applications. Despite great progress, it is still challenging to produce stable blue OLEDs with high efficiency and color purity.
In this paper, Prof. Adachi and collaborators are presenting a new OLED showing pure-blue emission with high efficiency and stability. Their optimized device consists of a 2-unit stacked tandem OLED with a hyperfluorescent emitting layer.
This research is not only important because of the high efficiency achieved with the fabricated OLEDs. This is also a proof-of-concept paper where the researchers used a blue/deep-blue and a sky-blue energy donor exhibiting TADF as an assistant dopant to sensitize a pure-blue emitter.
What Fluxim Tools Were Used :
The Setfos Emission module was used to fit angular photoluminescence data and determine the orientation of the dipoles of the TADF emitter.
Would you like to use Setfos to perform the same analysis?
Perovskite Solar Cells (Pero-PVs)
Potassium Thiocyanate‐Assisted Enhancement of Slot‐Die‐Coated Perovskite Films for High‐Performance Solar Cells
Fuzong Xu, Stefaan De Wolf, et al., Small Sci. 2021, 2000044 (DOI: 10.1002/smsc.202000044)
In this paper, you can learn a technique for obtaining solution-processed perovskite solar cells with a PCE of over 21%. The described method is suitable for the fabrication of large-area photovoltaics.
Generally, only spin-coating can give high-efficiency perovskite solar cells when the active layer is deposited via solution. However, this technique is not suitable for large-area manufacturing.
The group of Prof. Stefaan De Wolf at the KAUST Solar Center (KSC) demonstrated that by assisting Slot-Die Coating with potassium thiocyanate (KSCN), it is possible to obtain a perovskite film with carrier mobility, lifetime, and diffusion length comparable to single crystals. Slot-die coating is now suitable for the fabrication of large-area solar cells thanks to the proposed protocol, which brings the quality of the deposited perovskites to the level of the other deposition methods.
What Fluxim Tools Were Used :
The devices were put through a thorough characterization process. Several of the reported analyses, such as Transient Photovoltage (TPV), Transient Photocurrent (TPC), and Impedance Spectroscopy, have been performed with our all-in-one characterization tool Paios.
Read this paper and more perovskite solar cell research
Do you want to learn how Paios can be used to massively speed up the characterization process?
Perovskite Quantum-Dot Light-Emitting Electrochemical Cells (LEECs)
Highly Soluble CsPbBr 3 Perovskite Quantum Dots for Solution-Processed Light-Emission Devices
Y. Liu, J. Wang, et al., ACS Applied Nano Materials Article ASAP: (DOI: 10.1021/acsanm.0c02797)
Perovskite Quantum Dot (QD) Light-Emitting Electrochemical Cells (LECs) are easy to fabricate and could be a low-cost alternative to QD-LEDs.
Profs. Ludvig Edman and JIA WANG at Umeå University fabricated several types of light-emitting devices with a solution deposited perovskite QD emissive layer. They successfully demonstrated that ions are liberated from the PeQD structure during device operation. These ions are mobile and perform electrochemical doping, which makes the device functioning as a LEC even without an external electrolyte.
The best-performing PeQD-LEC delivered a peak luminance of 1090 cd/m2 at 6.8V.
What Fluxim Tools Were Used :
These researchers are simulating their LECs with Setfos. Their results demonstrate how a well-thought optical simulation can predict the behavior of the device before the actual fabrication. The simulation anticipated that by introducing a PVK spacer of a given thickness, the luminance would have increased by 28% with respect to the reference device. The actual experiment showed an improvement of 26%.
Read this paper and more perovskite QD LECs research
Do you want to learn more about Setfos?
Organic Light-Emitting Thin Films
Extrinsic Influences on Photoluminescence Spectral Lineshape in Thin Films
Matthew J. Dyson Tom P. A. van der Pol Stefan C. J. Meskers, Adv. Optical Mater. 2021, 2001997, (https://doi.org/10.1002/adom.202001997)
Interpretation of the experimental Photoluminescence (PL) spectrum of a thin-film can be complicated because of several phenomena, such as optical interference and self-absorption. However, getting significant information from the PL spectrum of a molecule/material is fundamental for the advancement of optoelectronics.
In this study, the research team led by Prof. Stefan Meskers at the Eindhoven University of Technology analyzed the alteration of fluorescence spectral lineshape of a given molecule in a thin-film due to several factors, such as the film thickness, incident angle, bandgap, and Stokes shift. The simulation is highlighting conditions under which these factors lead to significant differences between the experimental PL and the intrinsic photoluminescence of the layer under study.
What Fluxim Tools Were Used :
Setfos was used to perform several optical simulations to get insights into both the absorption and emission properties of the films. For example, they found it useful that Setfos accounts for the Purcell effect. This is making Setfos well suited for investigating emission from thin films that form optical microcavities.
Would you like to test the simulation power of Setfos? Take advantage of our free 1-month evaluation license.
Thanks to all the authors and co-authors. Your research is what motivates our development.