Review
Materials Science, Multidisciplinary
Dechao Yu, Ting Yu, Hui Lin, Songlin Zhuang, Dawei Zhang
Summary: This article summarizes the research progress in pursuing phosphors with quantum yield greater than unity in various applications such as display, lighting, and novel solar cells. The downconversion (DC) strategy is found to be effective in converting one high-energy photon to multiple low-energy photons. The absorption range can be broadened by introducing sensitizers and combining perovskite quantum dots, nanostructures, and organic dye molecules. The internal quantum yield is claimed to be greater than 1 in many near-infrared (NIR) DC systems, and the application of downconverting layers on commercial solar cells can increase photon conversion efficiency.
ADVANCED OPTICAL MATERIALS
(2022)
Article
Energy & Fuels
Hoon-Seok Jeong, Dongeon Kim, Seungin Jee, Min-Jae Si, Changjo Kim, Jung-Yong Lee, Yujin Jung, Se-Woong Baek
Summary: The fabrication of heterostructures via solution process is a crucial technology for efficient advanced-generation optoelectronics. Hybrid structures using colloidal quantum dots (CQD) and organic semiconducting molecules are gaining research interest due to their complementary optical and electrical properties. However, the challenge lies in blending and stabilizing the materials to form a functioning electronic ink.
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2023)
Article
Chemistry, Physical
Mostafa F. Abdelbar, Mohammed Abdelhameed, Mohamed Esmat, Maged El-Kemary, Naoki Fukata
Summary: The management of the solar spectrum through downshifting using highly luminescent quantum dots has shown great potential for improving the efficiency of solar cells by transferring high-energy UV light to silicon, leading to a significant enhancement in power conversion efficiency.
Article
Spectroscopy
Neeraj Kumar Mishra, Madan M. Upadhyay, Santosh Kumar, Kaushal Kumar
Summary: Dual mode emission was achieved in Ce3+/Yb3+/Er3+ ions activated Y3Al4GaO12 through effective energy transfer. The sample was characterized using various techniques, showing broad visible emission band and NIR emission bands. The material also exhibited up-conversion emission and optical thermometry ability.
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
(2022)
Article
Physics, Applied
Xi-Kai Yang, Jia-Wei Qiao, Zhi-Hao Chen, Zhen-Chuan Wen, Hang Yin, Xiao-Tao Hao
Summary: By incorporating CdSe quantum dots as a third component, this study has successfully enhanced the current density and power conversion efficiency of organic solar cells. CdSe QDs modulate charge dynamics, increase fluorescence external quantum efficiency, and enable Forster resonance energy transfer and fast charge transfer in BHJ films, resulting in improved overall device performance.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2021)
Article
Computer Science, Artificial Intelligence
Hanmin Sheng, Biplob Ray, Jinliang Shao, Dimuth Lasantha, Narottam Das
Summary: This paper proposes a Transfer Learning (TL) based PV energy yield model that can transfer knowledge from a source domain to a target domain, even when there are differences in time and location. The model improves the accuracy of solar energy forecasting and reduces dependence on large historical datasets.
EXPERT SYSTEMS WITH APPLICATIONS
(2022)
Article
Chemistry, Physical
Artur M. Andermann, Luis G. C. Rego
Summary: In non-fullerene organic photovoltaics, minimizing energy losses becomes less sensitive to temperature and electric field variations when the energetic driving force approaches the effective reorganization energy at the interface.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2022)
Article
Materials Science, Ceramics
Ana Kely Rufino Souza, Junior Reis Silva, Francine Bettio Costa, Joao Carlos Silos Moraes, Luiz Antonio de Oliveira Nunes, Luis Humberto da Cunha Andrade, Sandro Marcio Lima
Summary: The near-infrared downconversion mechanism in Te4+/Yb3+ co-doped tellurite glasses was studied using optical and thermal spectroscopy techniques. The excitation in the ultraviolet region led to intense emission of two NIR photons in the co-doped glasses, indicating a cooperative energy transfer mechanism. The maximum CET efficiency of 74% was obtained for the tellurite glass with the highest Yb3+ concentration, and the maximum DC efficiency of 137% was measured for the sample with 4 mol% of Yb3+.
CERAMICS INTERNATIONAL
(2023)
Article
Chemistry, Multidisciplinary
Joo Yeon D. Roh, Tyler J. Milstein, Daniel R. Gamelin
Summary: This paper introduces a ytterbium-doped all-inorganic lead-halide perovskite structure with broad absorption and high near-infrared photoluminescence quantum yields. The study found that this structure exhibits strong negative thermal quenching, with intensities at room temperature exceeding 100 times those at 5K. This temperature dependence is related to the spectral overlap and highlights the potential importance of quantum cutting in improving photovoltaic power conversion efficiencies.
Article
Chemistry, Multidisciplinary
Jingxuan Chen, Donglin Jia, Rongshan Zhuang, Yong Hua, Xiaoliang Zhang
Summary: A highly orientated PQD solid is achieved by precursor engineering and chemical stripping treatment. The highly ordered PQDs promote charge-carrier transport and reduce nonradiative recombination by decreasing surface trap states. This study provides a feasible approach for constructing high-performance optoelectronic devices.
ADVANCED MATERIALS
(2022)
Article
Chemistry, Physical
Yanze Wu, Xuezhi Bian, Jonathan Rawlinson, Robert G. Littlejohn, Joseph E. Subotnik
Summary: This research proposes an optimal semiclassical approach to study nonadiabatic dynamics in electronic systems with spin degrees of freedom. By generalizing Tully's surface hopping dynamics from coordinate space to phase space, the proposed method is valid in the presence of spin-orbit coupling and/or external magnetic fields.
JOURNAL OF CHEMICAL PHYSICS
(2022)
Article
Chemistry, Physical
Yanze Wu, Xuezhi Bian, Jonathan I. Rawlinson, Robert G. Littlejohn, Joseph E. Subotnik
Summary: This research explores the effectiveness of utilizing a generalized Tully's surface hopping dynamics approach for nonadiabatic dynamics simulations in electron systems with spin degrees of freedom. By generating relevant phase-space adiabatic surfaces and incorporating all Berry curvature effects, the algorithm is able to effectively simulate nonadiabatic dynamics in the presence of spin-orbit coupling and external magnetic fields.
JOURNAL OF CHEMICAL PHYSICS
(2022)
Article
Chemistry, Physical
Boyi Zhou, Dongzheng Yang, Daiqian Xie
Summary: This work calculates the rate coefficients of vibration-vibration energy transfer processes between HF and D-2 and finds that they generally follow the energy gap law. The results are in good agreement with experimental values reported previously.
JOURNAL OF CHEMICAL PHYSICS
(2021)
Article
Chemistry, Physical
Jingxuan Chen, Donglin Jia, Junming Qiu, Rongshan Zhuang, Yong Hua, Xiaoliang Zhang
Summary: This study reports a surface surgery treatment of perovskite quantum dots (PQDs) using ethylene diamine tetraacetic acid (EDTA) as a multidentate ligand. The results show that EDTA can remove Pb2+ ions and passivate surface defects of PQDs, thereby improving the electronic coupling. This surface modification significantly enhances the charge carrier transport and reduces nonradiative recombination, leading to a high efficiency of 15.25% in inorganic PQD solar cells (PQDSCs).
Article
Engineering, Multidisciplinary
Aleksandr Dekhovich, O. Taylan Turan, Jiaxiang Yi, Miguel A. Bessa
Summary: Data-driven modeling in mechanics is advancing rapidly, but cooperation is hindered by the forgetting problem of artificial neural networks. The authors developed a continual learning method applied to solid mechanics for predicting history-dependent plasticity behavior. This work aims to foster cooperative strategies in the mechanics community.
COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING
(2023)
Article
Multidisciplinary Sciences
J. J. Erik Maris, Freddy T. Rabouw, Bert M. Weckhuysen, Florian Meirer
Summary: Single-particle tracking is a powerful method for studying the motion of individual molecules and particles. The DiffusionLab software package provides motion analysis tools for challenging data sets, allowing trajectory classification based on motion type and computation of diffusion constants.
SCIENTIFIC REPORTS
(2022)
Article
Chemistry, Physical
P. Tim Prins, Dirk A. W. Spruijt, Mark J. J. Mangnus, Freddy T. Rabouw, Daniel Vanmaekelbergh, Celso de Mello Donega, Pieter Geiregat
Summary: Impurity doping of III-V colloidal quantum dots remains underexplored. This study shows that electron cooling is fast in copper-doped InP quantum dots, while hole localization is slow but still leads to efficient luminescence.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2022)
Article
Materials Science, Multidisciplinary
Arnoldus J. J. van Bunningen, Atul D. D. Sontakke, Ruben van der Vliet, Vincent G. G. Spit, Andries Meijerink
Summary: Narrower band red and green emission in phosphor-converted white light-emitting diodes can be achieved by using Mn2+ as a luminescent ion. The luminescence quenching temperature of Mn2+ is shown to vary greatly depending on the host material, with a positive correlation with the bandgap of the host. The quenching mechanism is found to be thermally activated photoionization, and a wide-bandgap host material is required for temperature-stable Mn2+ luminescence in high power LEDs.
ADVANCED OPTICAL MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
P. Tim Prins, Johanna C. van Der Bok, Thomas P. van Swieten, Stijn O. M. Hinterding, Andy J. Smith, Andrei V. Petukhov, Andries Meijerink, Freddy T. Rabouw
Summary: The synthesis of beta-NaYF4 nanocrystals from alpha-NaYF4 precursor particles was investigated using in situ small-angle and wide-angle X-ray scattering and ex situ electron microscopy. It was observed that the particle size distribution evolved from unimodal to bimodal, and eventually back to unimodal, with the final distribution being narrower than the initial distribution. The splitting of the size distribution was attributed to variations in the reactivity of the precursor particles.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Physics, Applied
Aleksandar Ciric, Thomas van Swieten, Jovana Perisa, Andries Meijerink, Miroslav D. D. Dramicanin
Summary: Luminescence thermometry is a versatile remote temperature sensing technique. This study introduces a novel measurement technique, LIR2, which combines the temperature sensitivity of ground- and excited-state populations. By using Y3Al5O12:Er3+,Yb3+ nanoparticles, the LIR2 method shows significant increase in sensitivity and measurement precision comparing to the conventional LIR method.
JOURNAL OF APPLIED PHYSICS
(2023)
Article
Chemistry, Multidisciplinary
Daniel Amgar, Gur Lubin, Gaoling Yang, Freddy T. T. Rabouw, Dan Oron
Summary: Semiconductor nanocrystal emission polarization is a crucial factor for nanocrystal-based technologies. A direct characterization method of the doubly excited-state relaxation transition dipole is proposed using heralded defocused imaging. The results reveal different transition dipole moments for different types of nanorods.
Article
Materials Science, Multidisciplinary
Jintao Kong, Andries Meijerink
Summary: Based on simple optical spectroscopy, this study identifies the reversible charge transfer mechanism in the benchmark persistent phosphors CaAl2O4:Eu2+,Nd3+. The forward charge transfer from Eu2+ to Nd3+ and the backward charge transfer from Nd2+ to Eu3+ are confirmed. The percentages of Eu2+ and Nd3+ involved in the charge transfer exceed previous estimates in other persistent phosphors, and this strategy also offers additional advantages of site selectivity in identifying different contributions of Nd3+ sites. These findings highlight the importance of reversible charge transfer in persistent phosphors and contribute to a better understanding of the persistent luminescence mechanism.
ADVANCED OPTICAL MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Jur W. de Wit, Thomas P. van Swieten, Marie Anne van de Haar, Andries Meijerink, Freddy T. Rabouw
Summary: Mn4+-doped fluorides are commonly used phosphors for warm-white lighting by converting blue light from LEDs into red light. However, they suffer from droop, i.e., decreasing performance at higher power, which limits their application in high-power scenarios. This study provides a comprehensive explanation of droop in Mn4+-doped K2TiF6 by considering all previously proposed mechanisms. By combining experimental and modeling approaches, the contributions of absorption bleach, thermal quenching, and Auger quenching at different excitation densities are quantified. This work contributes to a better understanding of the limitations of these materials and may inspire strategies to enhance their efficiency in high-power applications.
ADVANCED OPTICAL MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Freia Ruegenberg, Amador Garcia-Fuente, Markus Seibald, Dominik Baumann, Gregor Hoerder, Tim Fiedler, Werner Urland, Hubert Huppertz, Andries Meijerink, Markus Suta
Summary: Red-emitting narrow-band phosphors are crucial for the next generation of high-efficiency and optimized correlated color temperature white-light phosphor-converted light-emitting diodes. The crystalline structure of SALON:Eu2+ has been studied using X-ray diffraction, low-temperature luminescence spectroscopy, and ligand field theory to understand the local coordination symmetry and ligand ratio. The mutual energy transfer between Eu2+ centers in SALON:Eu2+ has been characterized using time-resolved luminescence.
ADVANCED OPTICAL MATERIALS
(2023)
Article
Nanoscience & Nanotechnology
Mark J. J. Mangnus, Jur W. de Wit, Sander J. W. Vonk, Jaco J. Geuchies, Wiebke Albrecht, Sara Bals, Arjan J. Houtepen, Freddy T. Rabouw
Summary: Quantum dots (QDs) have emerged as bright and color-tunable light sources for various applications. Multiparticle spectroscopy (MPS) is demonstrated as a high-throughput method to acquire statistically relevant information about the emissions of QDs. CdSe-based QDs show narrower line widths, less spectral diffusion, and less inhomogeneous broadening compared to InP-based QDs. The experiments pave the way for large-scale characterization of single-QD emission properties and the rational design of future QD structures.
Article
Chemistry, Multidisciplinary
Thimo S. Jacobs, Thomas P. van Swieten, Sander J. W. Vonk, Isa P. Bosman, Angela E. M. Melcherts, Bas C. Janssen, Joris C. L. Janssens, Matteo Monai, Andries Meijerink, Freddy T. Rabouw, Ward van der Stam, Bert M. Weckhuysen
Summary: This study investigates the local temperature variations in carbon dioxide methanation over a TiO2-supported Ni catalyst and links them to catalytic performance. Luminescence thermometry is used to measure the temperature-dependent emission and extract local temperatures. The findings highlight the importance of understanding and controlling temperature variations for optimizing catalyst performance.
Article
Materials Science, Multidisciplinary
Arnoldus J. J. van Bunningen, Simon Tobias Keizer, Andries Meijerink
Summary: Broad band NIR emission has been observed in concentrated Mn2+ phosphors, which is attributed to the presence of NIR emitting trap centers, possibly Mn3+. Exchange coupling between Mn2+ neighbors cannot explain the observed redshifts, as the magnitude is much larger than expected. Temperature and concentration dependent studies show that energy migration over the Mn2+ sublattice plays a key role in the NIR emission.
JOURNAL OF MATERIALS CHEMISTRY C
(2023)
Article
Chemistry, Multidisciplinary
Mark J. J. Mangnus, Vincent R. M. Benning, Bettina Baumgartner, P. Tim Prins, Thomas P. van Swieten, Ayla J. H. Dekker, Alfons van Blaaderen, Bert M. Weckhuysen, Andries Meijerink, Freddy T. Rabouw
Summary: This study investigates the influence of solvent and gas environments on the photoluminescence (PL) properties of lanthanide-doped nanocrystals, and explains the changes in PL spectrum and excited-state lifetimes using energy transfer mediated by molecular vibrations. EVET-mediated quenching holds promise for probing the local chemical environment of nanocrystals dispersed in a liquid or exposed to gaseous molecules.
Article
Chemistry, Multidisciplinary
Mark J. J. Mangnus, Vincent R. M. Benning, Bettina Baumgartner, P. Tim Prins, Thomas P. van Swieten, Ayla J. H. Dekker, Alfons van Blaaderen, Bert M. Weckhuysen, Andries Meijerink, Freddy T. Rabouw
Summary: The photoluminescence of lanthanide-doped nanocrystals can be quenched by energy transfer to nearby molecular vibrations, which is often undesired but can provide information about molecular vibrations in the local environment. This study investigates the influence of solvent and gas environments on the photoluminescence properties of NaYF4:Er3+,Yb3+ upconversion nanocrystals and relates the changes to quenching by electronic-to-vibrational energy transfer. The results suggest that EVET-mediated quenching can be used as a mechanism to probe the local chemical environment in liquid and gas-phase systems.
