Article
Materials Science, Multidisciplinary
M. Hemmerich, D. A. Klein, J. Meyer, F. Walther
Summary: In order to extend the lifetime of LED optical components, it is necessary to adapt all LED-related components, including lenses and other optical components, to increasing radiation levels. This study artificially aged polycarbonate samples with high-power blue LEDs using different driving modes and found a significant correlation between aging and the mode of exposure. Modulation of the LED, particularly a reduction of the duty cycle, has a positive effect on the durability of optical plastics at similar radiative energy loads.
Article
Energy & Fuels
Joshua Morse, Michael Thuis, Derek Holsapple, Ryan Willis, Michael D. Kempe, David C. Miller
Summary: This study benchmarked different packaging materials using IEC test methods and aimed to provide feedback and insight regarding optical degradation. The results confirmed that the pass/fail criteria of a 5% change in transmittance from IEC effectively identified poor encapsulant materials.
PROGRESS IN PHOTOVOLTAICS
(2022)
Article
Materials Science, Multidisciplinary
Irina A. Matveeva, Valentina T. Shashkova, Alexander V. Lyubimov, Galina V. Lyubimova, Liubov S. Koltsova, Andrey I. Shienok, Natalia L. Zaichenko, Peter P. Levin
Summary: The luminescent properties of photocured polycarbonate methacrylates containing organic fluorescent dyad were investigated. The dyad molecule has two photosensitive fragments – tetraarylimidazole with a hydroxyl group and azomethinocoumarin, resulting in two emissions: blue (450 nm) and green (535 nm) due to excited state intramolecular proton transfer (ESIPT). The intensities of these emissions were found to be significantly dependent on the excitation wavelength, as well as the length, flexibility, and polarity of the matrix oligomeric bridges.
Article
Biochemistry & Molecular Biology
Eloize Silva Alves, Cintia Stefhany Ripke Ferreira, Paulo Ricardo Souza, Andressa Rafaella Silva Bruni, Matheus Campos Castro, Bruno Henrique Figueiredo Saqueti, Oscar Oliveira Santos, Grasiele Scaramal Madrona, Jesui Vergilio Visentainer
Summary: This study investigated the effects of maltodextrin and gum arabic on freeze-dried human milk (HM), aiming to improve its quality and solubility. The results showed that both coatings led to higher solubility and better stabilization of HM, with gum arabic demonstrating superior performance. The combination of gum arabic and maltodextrin also showed promising results, indicating their potential synergistic effects.
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
(2023)
Article
Materials Science, Multidisciplinary
Pratima Borah, Sijoy Chandra Boro, Manos P. C. Kalita
Summary: Vanadium pentoxide (V2O5) nanocrystals have been chemically synthesized using two different capping agents (CTAB and PVP) and found to be effective photocatalysts under simulated solar radiation (SSR) for the degradation of acetaminophen. The CTAB-capped and PVP-capped V2O5 nanocrystals degraded 65% and 71% of acetaminophen after 270 minutes of irradiation, respectively. The photocatalysts were usable for two consecutive cycles without significant changes in degradation efficiencies and the solution pH influenced the photocatalysis process due to the split nature of the V2O5 conduction band.
Article
Chemistry, Applied
Guanghong Lin, Jingfeng Yin, Ziqian Lin, Yuwei Zhu, Weijian Li, Huizi Li, Zhu Liu, Hongping Xiang, Xiaoxuan Liu
Summary: This study investigated the preparation and performance of silicone/epoxy composite materials, showing excellent transparency, mechanical properties, and LED encapsulation. The composite can effectively reduce costs and improve microelectronic packaging.
PROGRESS IN ORGANIC COATINGS
(2021)
Article
Green & Sustainable Science & Technology
Wei Luo, Carlos Enrico Clement, Yong Sheng Khoo, Yan Wang, Aung Myint Khaing, Thomas Reindl, Abhishek Kumar, Mauro Pravettoni
Summary: This study presents a case study of photovoltaic module failures in the tropical climate of Singapore after over 10 years of operation, revealing different issues and degradation behaviors in multi-crystalline silicon, mono-crystalline silicon, and copper indium selenide modules, which are mainly affected by PID, corrosion, and encapsulant degradation.
Article
Chemistry, Physical
Ziqian Lv, Hanyu Xu, Zhiying Wang, Mochen Jia, Yanling Wei, Zuoling Fu
Summary: The research introduces a method to encapsulate CDs on the surface of KLM: Eu3+ to avoid aggregation-induced quenching in the solid state, and achieve the fabrication of a polychromatic nanoplatform emitting white light in multiple colors. By adjusting the proportion of the mixture, warm, neutral, and cold white light can be emitted, and a multi-mode information encryption approach has been designed.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Characterization & Testing
Jiajie Fan, Ye Chen, Zhou Jing, Mesfin Seid Ibrahim, Miao Cai
Summary: This study conducted constant moisture stress-accelerated degradation tests on silicone encapsulant with different thermal stresses, and predicted its real lumen decay and color shift lifetimes by integrating the accelerated lifetime model with the Gamma process model. The results showed that the degradation rate of silicone encapsulant is related to thermal stress, and the prediction accuracy varies when using lumen decay lifetime versus color shift degradation data.
Article
Energy & Fuels
Sona Ulicna, Archana Sinha, David C. Miller, Brian M. Habersberger, Laura T. Schelhas, Michael Owen-Bellini
Summary: Polyethylene-based EVA, POE, and TPO are commonly used polymer materials for PV module encapsulation. The choice of encapsulant is crucial for novel module designs to prevent performance degradation caused by optical transmittance loss, mechanical integrity issues, corrosion, and potential-induced degradation. The quality and resilience of the encapsulant are influenced by the additives used in its formulation. UV aging causes discoloration and changes in the polymer crystal structure, leading to changes in optical transmittance. Cross-linking and chain scission mechanisms occur, influenced by oxygen and high temperatures. Increasing chamber temperatures during UV stress tests amplify encapsulant discoloration and promote polymer cross-linking, causing severe and irreversible damage. Damp heat aging alone is insufficient to produce significant degradation, but combining stress tests allows detection of further degradation. Appropriate degradation screening methods are necessary to identify potential weaknesses in encapsulant materials.
SOLAR ENERGY MATERIALS AND SOLAR CELLS
(2023)
Article
Engineering, Electrical & Electronic
Yuanhan Chen, Yu-Chou Shih, Frank G. Shi
Summary: The study introduces a novel packaging approach for cost-effective and ultrathin high-power phosphor-based white LED emitters with outstanding reliability. By using a single silicone-phosphor thin layer in place of multiple phosphor layers, the new approach enhances the optical and thermal performance of LEDs, resulting in longer lifetime durability.
IEEE TRANSACTIONS ON DEVICE AND MATERIALS RELIABILITY
(2021)
Article
Polymer Science
Gustavo Coderch, Alexander Cordoba, Oscar Ramirez, Sebastian Bonardd, Angel Leiva, Marleen Haering, David Diaz Diaz, Cesar Saldias
Summary: The search for delivering added value to industrialized biobased materials, such as cellulose derivatives, is important in the current scientific, technological, and innovation fields. This study investigates the fabrication and use of cellulose acetate (CA) and perylene derivative (Pr) films exposed to dimethylformamide (DMF) solvent vapors, and their influence on optical, wettability, and topographical properties. The results show that solvent vapor induces preferential orientation and migration of Pr towards the polymer-air interface, improving the photocatalytic activity of the materials for dye photodegradation in aqueous media.
Article
Chemistry, Multidisciplinary
Ying Lu, Zhihang Zhao, Xianpeng Fan, Xinyu Cao, Mingtan Hai, Zhou Yang, Kun Zheng, Jiaxin Lu, Jingnan Zhang, Yongmei Ma, Rongben Zhang, Shibi Fang
Summary: UV curable ZrO2/phenyl-siloxane nano-composite double-layer encapsulants were prepared and optimized to achieve high and stable light extraction efficiency (LEE) for LEDs. The double-layer UV curing process was significantly faster than common thermal curing.
Article
Materials Science, Multidisciplinary
Ji 'an Song, Yan Gao, Zhichao Meng, Zelong Jiang, Xiaobing Cao, Qingguang Zeng, Tao Hu
Summary: This research proposed a nickel-bromide passivation strategy to improve the optical properties and chemical stability of blue emitting CsPbBr3 nanoplatelets. By repairing the surface Br- vacancies and enhancing the structural stability of CsPbBr3 lattice through Ni2+ doping, the emission efficiency of the nanoplatelets increased from 33.2% to 78%, and they can be stored for 30 days without significant PL loss. A liquid-type monochrome LED device fabricated using the passivated CsPbBr3 nanoplatelets as blue color convector showed no emission saturation even at a high driving current of 190 mA.
Article
Polymer Science
Ishrath Mohamed Irshadeen, Kevin De Bruycker, Aaron S. Micallef, Sarah L. Walden, Hendrik Frisch, Christopher Barner-Kowollik
Summary: An easily synthesized photoreactive chalcone moiety capable of undergoing photocycloaddition with visible light has been introduced. The chalcone exhibits peak reactivity at 440 nm and can participate in photoligation triggered by light from an LED at 505 nm. This chalcone offers advantages over styrylpyrenes in terms of synthetic efficiency.
Article
Construction & Building Technology
Paul Roelofsen, Kaspar Jansen, Peter Vink
Summary: This article discusses different thermal perception models linked to a mathematical thermophysiological human model and introduces some models developed by Stolwijk and Fiala. Among them, the FPC model includes the Dynamic Thermal Sensation (DTS) equation, which is specifically developed for use in combination with the FPC model. Due to the non-availability of the source code for later developed models, the Stolwijk model is still widely used. Therefore, the question arises whether a human transient thermal sensation equation combined with the Stolwijk model can be developed.
INTELLIGENT BUILDINGS INTERNATIONAL
(2023)
Article
Business
Lennart Teunissen, Emiel Janssen, Joost Schootstra, Linda Plaude, Kaspar Jansen
Summary: The cooling characteristics of eleven phase change materials (PCMs) for cooling humans in heat-stressed conditions were evaluated, along with the effects of packaging material and segmentation. Water-based PCMs showed higher cooling power but shorter lifespan compared to other PCMs. Flexible gels and salts demonstrated compromised cooling potential. Packaging material had no significant impact on cooling effectiveness, while segmentation lowered cooling power.
CLOTHING AND TEXTILES RESEARCH JOURNAL
(2023)
Article
Materials Science, Textiles
Paul Roelofsen, Kaspar Jansen
Summary: The study aims to analyze the impact of using cooling vests on the comfort and performance improvement of construction workers. Through calculation studies based on validated mathematical models, it is found that cooling vests have a significant beneficial effect on thermal sensation and performance loss reduction.
INTERNATIONAL JOURNAL OF CLOTHING SCIENCE AND TECHNOLOGY
(2023)
Article
Chemistry, Analytical
Beyza Bozali, Sepideh Ghodrat, Kaspar M. B. Jansen
Summary: Smart textiles, an emerging technology, are used for rehabilitation purposes and monitoring various bodily functions. To improve flexibility and comfort, researchers have developed textile-based sensors. This study integrated knitted strain sensors into wearable finger sensors for rehabilitation, achieving accurate responses to different finger angles. The thickness of the spacer layer between the finger and sensor was also investigated.
Review
Materials Science, Multidisciplinary
Qiang Liu, Sepideh Ghodrat, Gijs Huisman, Kaspar M. B. Jansen
Summary: This article reviews haptic wearables based on shape memory alloys (SMAs) and explores their potential applications in assisting visually impaired individuals, immersive technology, and remote interpersonal haptic communication.
MATERIALS & DESIGN
(2023)
Proceedings Paper
Engineering, Electrical & Electronic
Baoyun Sun, Jiarui Mo, Hemin Zhang, Henk W. van Zeijl, Willem D. van Driel, Guoqi Zhang
Summary: This paper presents a thermal-piezoresistive resonator based on a silicon carbide-on-insulator (SiCOI) platform, which overcomes the challenges of using silicon in harsh environments.
2023 IEEE 36TH INTERNATIONAL CONFERENCE ON MICRO ELECTRO MECHANICAL SYSTEMS, MEMS
(2023)
Article
Computer Science, Information Systems
Alexander Herzog, Simon Benkner, Babak Zandi, Matteo Buffolo, Willem D. Van Driel, Matteo Meneghini, Tran Quoc Khanh
Summary: This study reports on the degradation mechanisms and dynamics of silicone encapsulated high-power ultraviolet A (UV-A) light-emitting diodes (LEDs) with a peak wavelength of 365 nm. Stress tests were conducted for 8665 hours at forward currents ranging from 350 mA to 700 mA and junction temperatures up to 132 degrees C. The results showed a significant decrease in optical power, with faster degradation at higher operating conditions. The degradation mechanisms were analyzed, and a degradation model was proposed to estimate the device lifetime under different operating parameters. Additional stress test data was used to validate the accuracy of the model's lifetime predictions.
Article
Polymer Science
Suellen Pereira Espindola, Ben Norder, Kaspar M. B. Jansen, Jure Zlopasa, Stephen J. Picken
Summary: Tailoring the order in hierarchical structures is a key goal of bioinspired nanocomposite design. This work explores the mechanisms for nanocomposite ordering and demonstrates the importance of immobilizing 2D materials via network formation during evaporation. The study shows that a modified affine deformation strategy can lead to highly aligned nacre-like nanocomposites with improved mechanical and water vapor barrier properties.
Article
Sport Sciences
Puck Alkemade, Thijs M. H. Eijsvogels, Thomas W. J. Janssen, Kaspar M. B. Jansen, Boris R. M. Kingma, Hein A. M. Daanen
Summary: Upper-body cooling is more effective in reducing thermal strain than lower-body cooling in individuals with paraplegia, as it provides greater thermophysiological and perceptual benefits.
MEDICINE & SCIENCE IN SPORTS & EXERCISE
(2023)
Proceedings Paper
Engineering, Electrical & Electronic
Henry Martin, Marcia Reintjes, Dave Reijs, Sander Dorrestein, Martien Kengen, Sebastien Libon, Edsger Smits, Xiao Tang, Marco Koelink, Rene Poelma, Willem van Driel, GuoQi Zhang
Summary: This research investigates the integration of diamond heat spreaders during the back-end packaging process to enhance the thermal performance of packaged devices. The study found that the efficiency of the diamond heat spreader increases with increasing power input and verified the reliability of the thermally enhanced package through thermal cycling tests.
2023 IEEE 73RD ELECTRONIC COMPONENTS AND TECHNOLOGY CONFERENCE, ECTC
(2023)
Proceedings Paper
Engineering, Electrical & Electronic
Varun Thukral, Irene Bacquet, Michiel van Soestbergen, Jeroen Zaal, Romuald Roucou, Rene Rongen, Willem D. van Driel, GuoQi Zhang
Summary: This study proposes a highly accelerated vibration test method that takes into account the effects of both vibration and temperature loading on solder joints. Simulations and experiments show that under combined stress environments, the solder joints on rectangular PCBs have a shorter lifetime, while those on square PCBs have a longer lifetime.
2023 IEEE 73RD ELECTRONIC COMPONENTS AND TECHNOLOGY CONFERENCE, ECTC
(2023)
Proceedings Paper
Engineering, Electrical & Electronic
Leiming Du, Xiujuan Zhao, Rene Poelma, Willem Van Driel, Guoqi Zhang
Summary: This study firstly reports the creep properties of SnBiAgCu solder alloy under different temperatures and finds that the addition of Bi improves creep resistance. Additionally, dynamic mechanical analyses and finite element modeling are used to investigate the influence of potting materials on failure mechanisms, providing optimization references for the selection of solder and potting materials.
2023 IEEE 73RD ELECTRONIC COMPONENTS AND TECHNOLOGY CONFERENCE, ECTC
(2023)
Proceedings Paper
Thermodynamics
Maryam Yazdan Mehr, Pejman Hajipour, H. van Zeijl, W. D. van Driel, Thierry Cooremans, Francois. De Buyl, G. Q. Zhang
2023 24TH INTERNATIONAL CONFERENCE ON THERMAL, MECHANICAL AND MULTI-PHYSICS SIMULATION AND EXPERIMENTS IN MICROELECTRONICS AND MICROSYSTEMS, EUROSIME
(2023)
Proceedings Paper
Thermodynamics
Leiming Du, Dong Hu, Rene Poelm, Willem Van Driel, Kouchi Zhang
Summary: The application of microporous sintered copper as a bonding material in power electronic devices has attracted considerable interest, but there is a lack of research on its mechanical properties. Understanding the microscale mechanical properties is essential for predicting fracture failure.
2023 24TH INTERNATIONAL CONFERENCE ON THERMAL, MECHANICAL AND MULTI-PHYSICS SIMULATION AND EXPERIMENTS IN MICROELECTRONICS AND MICROSYSTEMS, EUROSIME
(2023)
Proceedings Paper
Thermodynamics
Adwait Inamdar, Michiel Van Soestbergen, Amar Mavinkurve, Willem Van Driel, Guoqi Zhang
Summary: Moulding compounds used for encapsulating electronics degrade under harsh conditions and affect the reliability of the package. This paper proposes a three-step modelling approach to simulate the degradation process and analyze its impact on package performance through experiments and simulations.
2023 24TH INTERNATIONAL CONFERENCE ON THERMAL, MECHANICAL AND MULTI-PHYSICS SIMULATION AND EXPERIMENTS IN MICROELECTRONICS AND MICROSYSTEMS, EUROSIME
(2023)
Article
Materials Science, Multidisciplinary
Yanbin Wang, Xinyou Huang, Ziqiu Cheng, Penghui Chen, Yuyang Chen, Junhao Ye, Haohong Chen, Zhenzhen Zhou, Denis Yu Kosyanov, Jiang Li
Summary: Uniform Al2O3-Ce:LuAG composite phosphor ceramics (CPCs) with excellent luminescent properties and thermal stability have been successfully synthesized in this study, showing great potential for application in solid-state laser lighting.
Article
Materials Science, Multidisciplinary
Syed Muhammad Ali Zaidi, Mazhar Ali Kalyar, Zulfiqar Ali Raza, Aayesha Shoukat, Rubaila Waseem, Muhammad Aslam
Summary: Polyvinyl alcohol (PVA) nanocomposite strips embedded with graphene nanosheets and copper-ferrite nanoparticles were synthesized using solution casting technique. Laser pulse irradiations were then applied to modify the structural, optical, and electrical properties of the strips, showing potential for optoelectronic devices.
Article
Materials Science, Multidisciplinary
Yunru Chen, Jialing Wu, Jiajia Wang, Shihui Ma, Hongwei Yu
Summary: This paper investigates the angular non-critical phase-matching second-harmonic-generation properties of Ba3(ZnB5O10)PO4 crystal and explores its potential applications in the output spectral regions.
Article
Materials Science, Multidisciplinary
Qun Jing, Menglin Zhu, Lu Li, Xu Ji, Haiming Duan, Henglei Chen, Ming-Hsien Lee
Summary: The paper introduces two new nonlinear optical materials, MZnPO4 (M = Rb, Cs), synthesized by cation substitution. These materials exhibit a honeycomb-like structure and show mild SHG responses with short absorption edges. The thermal properties, IR spectra, and theoretical calculations of the materials are also discussed.
Article
Materials Science, Multidisciplinary
Camila Ianhez-Pereira, Akhil Kuriakose, Ariano De Giovanni Rodrigues, Ana Luiza Costa Silva, Ottavia Jedrkiewicz, Monica Bollani, Marcio Peron Franco de Godoy
Summary: This study aims to evaluate the crystalline changes induced by ultrafast laser micromachining on manganese oxide thin films using micro-Raman spectroscopy. The results show that laser-writing is effective in locally modifying low-crystallinity films and increasing crystallite sizes, highlighting an interesting approach to evaluate laser-induced structural modifications on metal oxide thin films.
Article
Materials Science, Multidisciplinary
Kamal Bansal, Neeraj Kumar Mishra, Ibrahim Abdullahi, Param Jeet Singh, Mohit Tyagi, Sukhpal Singh
Summary: A novel Sm3+ activated oxyfluoride glass was synthesized and its structure and properties were analyzed. The glass showed potential applications in lasers, optical temperature sensing, and high-energy scintillators.
Article
Materials Science, Multidisciplinary
Xingjian Wang, Zhixu Wu, Jiawei Zhu, Yubin Kang, Mengqiang Cai, Yong Xia, Hui Deng
Summary: Antimony sulfide (Sb2S3) has been investigated as a promising material for visible light photodetectors due to its non-toxicity, stability, and high absorption coefficient. In this study, we systematically explored the impact of key parameters on the performance of Sb2S3 devices using simulation and successfully fabricated self-powered photodetectors with high responsivity and specific detectivity. Furthermore, we demonstrated the application of the Sb2S3 detector in a scanning imaging system, showcasing its potential for developing new types of visible light detectors and imaging systems.
Article
Materials Science, Multidisciplinary
O. I. Sallam, R. M. Ahmed
Summary: The 20NaF-60P2O5-20Na2O fluorophosphate glass systems doped with 3 wt% of CoO and NiO were investigated for their optical parameters before and after gamma irradiation. The presence of defects within the glass network and the addition of transition metals were found to affect the properties of the composites. After irradiation, a red shift was observed in the dissipation factor spectrum. The energy lost at the surface of the composites was larger than the energy lost within the constituent materials. All investigated composites showed insulating behavior and exhibited increased nonlinear optical parameters after irradiation, with the CoO-doped composite showing the highest values.
Article
Materials Science, Multidisciplinary
Fahimeh Ahmadi, Zeinab Ebrahimpour, Asghar Asgari, Bao Van
Summary: In this study, Er3+-doped sulfophosphate glasses containing titanium nanoparticles (TiO2 NPs) and different concentrations of silver nanoparticles (AgNPs) were synthesized. The impact of AgNPs on the physical and structural characteristics, optical absorption and emission features, and photocatalytic activity of the glasses were investigated. The results showed that the addition of AgNPs enhanced the emission intensity of the glasses, with the system containing 0.04 mol% of AgNPs exhibiting optimal performance. Furthermore, the presence of AgNPs and TiO2 NPs in the glass matrix positively affected the photocatalytic performance.
Article
Materials Science, Multidisciplinary
Zhuang Li, Rongfei Huang, Wei Yuan, Shaoqiang Zheng, Wenlu Liao, Huiying Xu, Zhiping Cai
Summary: This study reports the first realization of an 868 nm Pr:YLF laser pumped by an InGaN blue laser diode. The laser achieved a maximum power of 641 mW with stable output and good beam quality. The experimental results were in agreement with theoretical simulations.
Article
Materials Science, Multidisciplinary
Bhishma Karki, Youssef Trabelsi, Amrindra Pal, Sofyan A. Taya, Ram Bharos Yadav
Summary: This study proposes an SF11 Prism- Ag- ZnO nanowires-CeO2-Sensing layer-based surface plasmon resonance sensor for measuring dopamine concentration in human blood. The sensor demonstrates high sensitivity and detection accuracy, and holds significant importance for early diagnosis of neurological diseases.
Article
Materials Science, Multidisciplinary
M. Taoufiq, A. Soussi, A. Elfanaoui, A. Ait Hssi, S. Baoubih, A. Ihlal, K. Bouabid
Summary: In this study, the effect of copper doping within ZnS on glass substrates was investigated through experimental and theoretical approaches. Pure ZnS and Cu-doped ZnS films with varying copper concentrations were deposited on glass substrates using the SILAR technique. The structural, morphological, and optical properties of the films were characterized, and the theoretical FP-LAPW method based on density functional theory was employed to study the properties of copper-doped ZnS.
