Article
Materials Science, Multidisciplinary
Inge Verboven, Joao Silvano, Ken Elen, Hilde Pellaers, Bart Ruttens, Jan D'Haen, Marlies K. Van Bael, An Hardy, Wim Deferme
Summary: The study demonstrates that ultrasonically spray coating is an excellent printing technique for applying silver nanowires and conductive polymers, forming electrodes with high transparency and conductivity, which have been successfully applied in organic light-emitting diodes.
ADVANCED ENGINEERING MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Jaber Saghaei, Steven M. Russell, Hui Jin, Paul L. Burn, Almantas Pivrikas, Paul E. Shaw
Summary: This study investigates the impact of annealing and phase separation on the performance of solution-processed OLEDs, highlighting the improved performance of devices with a low dendrimer concentration in the emissive layer following annealing. The external quantum efficiency of the OLEDs is found to be higher than expected due to different pathways of exciton formation under photoexcitation and charge injection.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Article
Multidisciplinary Sciences
Jin-Hoon Kim, Jin-Woo Park
Summary: An intrinsically stretchable organic light-emitting diode, made of highly stretchable constituent materials, is able to emit light under strains as large as 80%. It has a low turn-on voltage of 8 V and a maximum luminance of 4400 cd m(-2) from both the anode and cathode sides. The device can withstand repeated stretching cycles up to 200 times and shows improved light-emitting efficiency with small stretches up to 50%.
Article
Chemistry, Multidisciplinary
Dianming Sun, Eimantas Duda, Xiaochun Fan, Rishabh Saxena, Ming Zhang, Sergey Bagnich, Xiaohong Zhang, Anna Koehler, Eli Zysman-Colman
Summary: This work presents a solution to the challenge of developing high-performance solution-processed OLEDs by using highly efficient TADF dendrimers as emitters. By incorporating meta- and para-connected donor dendrons about a central triazine acceptor, the conflicting requirements of achieving a small Delta E-ST and a large oscillator strength are resolved. The solution-processed OLEDs exhibit excellent external quantum efficiency, current efficiency, and power efficiency, making them the most efficient host-free solution-processed OLEDs reported to date. Further optimization of the charge balance within the devices leads to improved efficiency rolloff at higher luminance.
ADVANCED MATERIALS
(2022)
Article
Engineering, Environmental
Xinxin Ban, Tao Zhou, Kaizhi Zhang, Qingpeng Cao, Fengjie Ge, Dongen Zhang, Peng Zhu, Zunzheng Liu, Zimin Li, Wei Jiang
Summary: This study demonstrates for the first time that exciplex emission can be achieved by a single pure molecule, called homojunction exciplex. By using a flexible alkyl chain to link the donor and acceptor unit, the resulting compound maintains efficient exciplex emission property and eliminates phase separation issues. This research provides a new avenue for simplifying the structure and enhancing the stability of OLEDs.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Chemistry, Multidisciplinary
Xiangyu Fu, Yash Mehta, Yi-An Chen, Lei Lei, Liping Zhu, Nilesh Barange, Qi Dong, Shichen Yin, Juliana Mendes, Siliang He, Renuka Gogusetti, Chih-Hao Chang, Franky So
Summary: The study demonstrates highly directional and polarized light emission from LEDs by selectively diffracting the TE waveguide mode, showing potential for more efficient photonic applications.
ADVANCED MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
Jiaxuan Yin, Jingyu Wang, Xiaofang Li, Ruixia Wu, Shuaibing Li, Fenghua Li, Liang Zhou
Summary: In this study, efficient red phosphorescent OLEDs were designed and fabricated using a solution processing method. By optimizing the doping concentrations and ratios of host materials, the incorporation of Eu(DBM)3Phen molecules effectively enhanced device performance through improved charge distribution and triplet energy transfer.
ORGANIC ELECTRONICS
(2023)
Article
Materials Science, Multidisciplinary
Xinwen Zhang, Jingxi An, Yanan Xu, Yuzhu Wang, Yanan Lu, Yue Qin, Wen-Yong Lai, Yuehua Chen, Wei Huang
Summary: The study demonstrates the potential of brush-coating technology in fabricating high-performance organic light-emitting diodes with uniform organic films. The brush-coated OLEDs show comparable performance to spin-coated devices, indicating the effectiveness of the simple fabrication method.
JOURNAL OF MATERIALS CHEMISTRY C
(2021)
Article
Chemistry, Multidisciplinary
Shu-Jen Wang, Anton Kirch, Michael Sawatzki, Tim Achenbach, Hans Kleemann, Sebastian Reineke, Karl Leo
Summary: Conventional organic optoelectronic devices have low carrier mobility due to disorder. This study presents monolithic integrated triclinic crystal rubrene light-emitting diodes (LEDs) with engineered functional additives. The crystalline LEDs show superior charge transport, operational stability, and long-term stability. However, the crystalline phase reduces the overall performance compared to amorphous rubrene in terms of exciton dynamics and annihilation rates. The potential applications of rubrene and/or its derivatives crystalline films for improving the performance of organic and hybrid optoelectronic devices are discussed.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Spectroscopy
Hui Du, Yangyang Guo, Dongyue Cui, Shuhong Li, Wenjun Wang, Yunlong Liu, Yicun Yao, Ling Zhao, Xiaochen Dong
Summary: This study proposed a simple yet effective method to fabricate flexible electrodes with optical transparency and sheet resistance comparable to ITO. OLEDs based on these composite electrodes showed superior performance compared to OLEDs with ITO anode due to lower sheet resistance and smoother surface, as well as the Far SPR effect.
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
(2021)
Article
Chemistry, Multidisciplinary
Zhenyang Liu, Yingying Sun, Tong Cai, Hanjun Yang, JinXing Zhao, Tao Yin, Chaoqi Hao, Mingjun Chen, Wenwu Shi, Xiaoxiao Li, Li Guan, Xu Li, Xinzhong Wang, Aiwei Tang, Ou Chen
Summary: This study demonstrates the synthesis of 2D Cs2AgInxBi1-xCl6 alloyed double perovskite nanoplatelets with controlled morphology and composition. The obtained NPLs show unique optical properties and good stability, making them suitable for solution-processing in low-cost device manufacturing. Solution-processed light-emitting diodes using Cs2AgIn0.9Bi0.1Cl6 alloyed double perovskite NPLs as the emitting component exhibit good performance.
ADVANCED MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Jeong Yong Park, Seon Lee Kwak, Hea Jung Park, Do-Hoon Hwang
Summary: We synthesized a new polymer PICA for solution-processed OLEDs, with suitable energy levels for hole transport. PICA was photo-crosslinked with FPA as the photoinitiator, resulting in enhanced solvent resistance. OLED devices using PICA as the hole-transporting layer exhibited better performance than those using poly-TPD:FPA. This study demonstrates the potential application of photo-crosslinked PICA in solution-processed OLEDs.
Article
Polymer Science
Ruslana Udovytska, Pavel Chulkin, Aleksandra Wypych-Puszkarz, Jaroslaw Jung
Summary: The article explores three different degradation mechanisms of polymer light-emitting diodes (PLEDs) caused by damage to the protective layer. By comparing PLEDs with different encapsulation methods, the study investigates the impact of protective layer damage on electroluminescence and charge transport properties. Impedance spectroscopy is used to analyze the degradation mechanism related to charge transport.
Article
Chemistry, Multidisciplinary
Nengquan Li, Zhanxiang Chen, Changjiang Zhou, Fan Ni, Zhongyan Huang, Xiaosong Cao, Chuluo Yang
Summary: This study discovered two new host materials, 3CzAcPy and 9CzAcPy, which have high triplet energy levels, thermal stability, and excellent film morphology for organic light-emitting diodes (OLEDs). The isomeric effect of the host materials has a significant impact on the properties and performance of solution-processed TADF OLEDs. The new hosts achieved state-of-the-art device performance for both donor-acceptor type and multi-resonance TADF emitters.
ADVANCED MATERIALS
(2023)
Article
Chemistry, Physical
Xinyu Shen, Hua Wu, Xiaoyu Zhang, Meili Xu, Junhua Hu, Jinyang Zhu, Bin Dong, William W. Yu, Xue Bai
Summary: The all-solution process for inorganic perovskite nanocrystals (PNCs) LEDs shows great potential for new-generation illumination and displays, but the challenge lies in the injection barriers and charge injection imbalance. The introduction of CBP into the hole transport layer (HTL) efficiently modulates the charge carrier mobility and energy level, resulting in barrier-free charge injection and optimal performance for solution-processed PNC LEDs. The luminance of red LEDs reaches 2990 cd m(-2) and the external quantum efficiency achieves 8.1%, with improved turn-on voltage and roll-off due to more balanced charge injection.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2021)
Article
Chemistry, Multidisciplinary
Jochen Vanderspikken, Quan Liu, Zhen Liu, Tom Vandermeeren, Tom Cardeynaels, Sam Gielen, Bruno Van Mele, Niko Van den Brande, Benoit Champagne, Koen Vandewal, Wouter Maes
Summary: This research explores the enhancement of charge transfer absorption by altering the side chains of organic semiconductor donor polymers, thereby increasing the interfacial area between the polymer and fullerene. This improvement extends the detection range and performance of organic narrow-band photodetectors.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Article
Spectroscopy
D. Klenitsky, L. L. Gladkov, I. V. Vershilovskaya, D. Petrova, A. S. Semeikin, W. Maes, M. M. Kruk
Summary: The pi-conjugation pathways and degrees of aromaticity for NH-tautomers of corrole free bases were determined using quantum chemistry methods and absorption spectroscopy. The formation of pi-conjugation pathway involved different participation of atoms in the macrocycle skeleton. Conjugation pathways with 18 pi-electrons were found to be dominant. Each NH-tautomer had its own distinct pi-conjugation pathway, leading to different degrees of aromaticity. The peripheral substitution architecture of the macrocycle was found to influence the degree of aromaticity. A method for controlling the equilibrium between the NH-tautomers by designing the electron-density distribution in the macrocycle was proposed and experimentally proved.
JOURNAL OF APPLIED SPECTROSCOPY
(2022)
Article
Materials Science, Multidisciplinary
Omar Beckers, Sander Smeets, Laurence Lutsen, Wouter Maes
Summary: Continuous flow chemistry offers new opportunities for the synthesis of conjugated polymers in organic electronics, addressing issues with traditional batch synthesis. Despite its potential, further research and application are needed to fully explore the capabilities of continuous flow chemistry.
JOURNAL OF MATERIALS CHEMISTRY C
(2022)
Article
Materials Science, Multidisciplinary
Simon Paredis, Tom Cardeynaels, Jasper Deckers, Andrew Danos, Dirk Vanderzande, Andrew P. Monkman, Benoit Champagne, Wouter Maes
Summary: This study investigates the influence of a more extended conjugated system or the presence of a sulfur-containing heteroaromatic spacer on the emissive properties by replacing the bridging phenyl group in a fluorescent phenoxazine-benzothiazole donor-acceptor dyad with a naphthalene or a thiophene moiety. The results show that these seemingly small structural alterations strongly affect the relative positions of the excited states, the fluorescence intensity, and the emission mechanism. Notably, the incorporation of the thiophene group promotes both room temperature phosphorescence and singlet oxygen generation.
JOURNAL OF MATERIALS CHEMISTRY C
(2022)
Article
Chemistry, Applied
Tom Vandermeeren, Quan Liu, Sam Gielen, Dries Theunissen, Siebe Frederix, Melissa Van Landeghem, Zhen Liu, Niko Van den Brande, Jan D'Haen, Jochen Vanderspikken, Laurence Lutsen, Koen Vandewal, Wouter Maes
Summary: Research on organic semiconducting polymers has led to the synthesis of push-pull copolymer PDTPQx using different polymerization methods, and the development of near-infrared organic photodetectors based on these polymers. The devices prepared from direct arylation polymerization (DArP) outperform those prepared from Stille polymers in terms of dark current density and external quantum efficiency. These findings are important for the application of organic resonant cavity photodetectors.
Article
Energy & Fuels
Jeroen Hustings, Nico Fransaert, Kristof Vrancken, Rob Cornelissen, Roland Valcke, Jean V. Manca
Summary: Photovoltaic photographs are a new application that integrates images into semi-transparent solar cells using a light-induced process to pattern the photoactive layer, with potential applications in building integrated photovoltaics.
SOLAR ENERGY MATERIALS AND SOLAR CELLS
(2022)
Article
Optics
Oskar J. Sandberg, Christina Kaiser, Stefan Zeiske, Nasim Zarrabi, Sam Gielen, Wouter Maes, Koen Vandewal, Paul Meredith, Ardalan Armin
Summary: Researchers demonstrate that the dark saturation current in organic photodiodes is fundamentally limited by mid-gap trap states, which leads to an upper limit for specific detectivity. Photodiodes are widely used in industry and consumer electronics. The use of organic semiconductors has gained considerable interest due to their versatile optoelectronic properties and potential for low-cost manufacturing.
Article
Green & Sustainable Science & Technology
Bjorn Joos, Ken Elen, Jonathan van den Ham, Nicole Meulendijks, Pascal Buskens, Andreas Paulus, Koen Wouters, Jean Manca, Jan D'Haen, Sudhanshu Shukla, Bart Vermang, Marlies Van Bael, An Hardy
Summary: A benign aqueous route for bismuth-containing photoelectrodes using CuBi2O4 as a photocathode is proposed. The method offers advantages of elemental homogeneity, ease of fabrication, and production of phase-pure kusachiite crystalline phase. The fabricated CuBi2O4 photocathodes demonstrate competitive photocurrent densities, comparable to non-aqueous organic synthesis routes.
ADVANCED SUSTAINABLE SYSTEMS
(2023)
Article
Chemistry, Physical
Joao Silvano, Sarallah Hamtaei, Pieter Verding, Bart Vermang, Wim Deferme
Summary: This study proposes a design of experiments (DoE) approach to analyze and optimize the fabrication of perovskite thin films by ultrasonic spray coating. The investigation reveals that a shorter distance between the air gun and the sample (2 cm) coupled with high gas pressure (7.6 bar) during the quenching step are the most influential parameters for the production of high-quality films, leading to an average efficiency of 14.8%.
ACS APPLIED ENERGY MATERIALS
(2023)
Article
Engineering, Electrical & Electronic
Juul Goossens, Thijs Vandenryt, Joseph W. W. Lowdon, Bart van Grinsven, Kasper Eersels, Wim Deferme, Ronald Thoelen
Summary: Molecular imprinted polymers (MIPs) are used for their selective recognition of different analytes, but the immobilization process poses challenges. This research introduces dye-displacement MIPs to enhance their application potential. A disposable lab-on-chip cartridge is used to allow MIPs to interact with the target solution, coupled to a portable optical sensor setup for quick screening of samples. The setup has the capability to identify different color dyes and intensities, and can be used for various sensing applications including food quality assessment, environmental testing, and pharmaceutical analysis.
IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT
(2023)
Article
Chemistry, Multidisciplinary
Rachith Shanivarasanthe Nithyananda Kumar, Maarten Eerdekens, Yovan de Coene, Veda Sandeep Nagaraja, Shabnam Ahadzadeh, Melissa Van Landeghem, Thierry Verbiest, Wim Deferme
Summary: The spatial and surface coverage dependence of plasmonic gold nanoparticles is controlled by a roll-to-roll compatible ultrasonic spray coating technique, resulting in enhanced fluorescence and charge transport in organic light emitting diodes. Two-photon fluorescence microscopy shows a 2-fold enhancement in multi-photon fluorescence for gold nanoparticles stabilized by polystyrene sulfonate (PSS) located 10 nm away from the super yellow fluorophore. Fluorescence enhancement, combined with approximately 2% surface coverage of PNPs, leads to a 33%, 20%, and approximately 40% increase in electroluminescence, luminous efficacy, and external quantum efficiency, respectively.
NANOSCALE ADVANCES
(2023)
Article
Computer Science, Interdisciplinary Applications
Ian Sachs, Marc Fuhrmann, Wim Deferme, Hildegard Moebius
Summary: X-ray reflectivity (XRR) is a useful tool for investigating thin layers and buried interfaces. However, the roughness of the layers and interfaces limits the accuracy of XRR measurements. This paper focuses on the investigation of indium tin oxide (ITO), a transparent anode material in organic light emitting devices (OLEDs). By adding a smoothing layer to the ITO, it is possible to determine the thickness, roughness, and density of spikes in XRR measurements. The study also shows that a smoothing layer enhances the sensitivity of XRR measurements on rough surfaces.
ENGINEERING REPORTS
(2023)
Article
Materials Science, Multidisciplinary
Sam Gielen, Virginia Cuesta Gomez, Sonny Brebels, Tyler James Quill, Jochen Vanderspikken, Laurence Lutsen, Pilar de la Cruz, Koen Vandewal, Fernando Langa, Wouter Maes
Summary: This study presents the design and synthesis of novel push-pull type meso-ethynyl-extended porphyrin compounds and their evaluation in near-infrared organic photodetectors. The compounds show excellent light absorption performance and photoconversion efficiency, making them promising candidates for small molecule-based near-infrared photodetectors.
JOURNAL OF MATERIALS CHEMISTRY C
(2022)
Article
Physics, Applied
Joao Silvano, Jacopo Sala, Tamara Merckx, Yinghuan Kuang, Pieter Verding, Jan D'Haen, Tom Aernouts, Bart Vermang, Wim Deferme
Summary: This paper investigates ultrasonically spray coated perovskite layers for photovoltaic applications, with a particular focus on the quenching-assisted crystallization step. By introducing different quenching techniques, large-scale production of perovskite solar cells with improved efficiency can be achieved.
Article
Materials Science, Multidisciplinary
Tom Cardeynaels, Marc K. Etherington, Simon Paredis, Andrei S. Batsanov, Jasper Deckers, Kleitos Stavrou, Dirk Vanderzande, Andrew P. Monkman, Benoit Champagne, Wouter Maes
Summary: The color purity and stability in multi-donor TADF emitters are crucial for OLED design. In this study, an alternative donor unit was introduced to improve color stability, but it resulted in a low photoluminescence quantum yield, rendering it unsuitable for device applications.
JOURNAL OF MATERIALS CHEMISTRY C
(2022)
Article
Materials Science, Multidisciplinary
Jinfei Dai, Chenjing Zhao, Jie Xu, Hossein Roshan, Hua Dong, Francesco Di Stasio, Fang Yuan, Bo Jiao, Zhaoxin Wu
Summary: In this study, the performance of perovskite nanocrystal light emitting diodes (PNC-LEDs) was enhanced through rational device structure design and the application of high-performance perovskite nanocrystal emitting layers.
ORGANIC ELECTRONICS
(2024)
Article
Materials Science, Multidisciplinary
Jia-Hua Yeh, Suhendro Purbo Prakoso, Leon Lukhas Santoso, Shi-Ju Chen, Bryan Chiang, Ju-Chieh Cheng, Ru-Ning Zhang, Yu-Cheng Chiu
Summary: This study demonstrates the application of a renewable material called dextrin-SMS in the production of electret filters and transistor memory. Dextrin-SMS material can maintain prolonged electrostatic charges and has a relatively wide memory window, making it suitable for the production of biodegradable face masks and green electronics.
ORGANIC ELECTRONICS
(2024)
Article
Materials Science, Multidisciplinary
Ahmad Telfah, Qais M. Al-Bataineh, Ahmad A. Ahmad, Rund Abu-Zurayk, Carlos J. Tavares, Johannes Etzkorn, Farzad Foadian
Summary: Polyacrylic acid complexed with polyaniline (PAA/PANI) composite materials have the potential to form organic mixed ion-electron conductive (OMIEC) films, which can be used in optoelectronic and energy storage applications. The composite films are formed through an acid-base reaction, resulting in strong electrostatic interactions and intermolecular hydrogen bonds between PANI and PAA. The separation of PANI-rich domains from PAA-rich matrix in the composite films is observed. The electrical conductivity of the composite films is higher when the content of PANI is 33 wt%, due to the high ionic-electronic coupling at the interface between phase-separated regions.
ORGANIC ELECTRONICS
(2024)
Article
Materials Science, Multidisciplinary
Min-Chih Hou, Dian Luo, Yu-Ting Huang, Shun-Wei Liu, Chin-Wei Lu, Chih-Hao Chang, Hai-Ching Su
Summary: Light-emitting electrochemical cells (LECs) have great potential for novel emission applications, but their relatively low device efficiency hinders their competitiveness with other emission technologies. A study finds that increasing the concentration of small TiO2 nano-particles in the diffuser film can enhance light extraction and improve the device efficiency of LECs.
ORGANIC ELECTRONICS
(2024)
Article
Materials Science, Multidisciplinary
Qiaoli Niu, Yao Xu, Jun Yang, Wei Hua, Baoxiang Chai, Zequan Zhang, Yuhui Ma, Wenjin Zeng, Ana Flavia Nogueira, Ruidong Xia
Summary: By introducing CPB as a defect passivation agent in the perovskite precursor solution, the optoelectronic properties of perovskite films can be significantly improved and non-radiative carrier recombination can be effectively suppressed. CPB-modified perovskite solar cells exhibit lower trap-state density and stronger carrier migration capability, leading to enhanced power conversion efficiency and stability.
ORGANIC ELECTRONICS
(2024)
Article
Materials Science, Multidisciplinary
Hulya Ozturk Dogan, Fatma Yildirim, Zeynep Orhan, Ali Ben Ahmed, Mostefa Benhaliliba, Sakir Aydogan
Summary: In this study, efficient self-powered visible and UV photodetectors based on hybrid organic-inorganic materials were demonstrated. The photodetectors showed excellent UV detecting capability and good photoresponsivity.
ORGANIC ELECTRONICS
(2024)
