Article
Chemistry, Multidisciplinary
Islam Mohammad Shafiqul, Raj Deep, Jie Lin, Toshiyuki Yoshida, Yasuhisa Fujita
Summary: In this study, nitrogen-doped zinc oxide nanoparticles were successfully synthesized using the gas evaporation method with DC arc plasma. The nitrogen concentration was found to have an impact on the Raman spectra and photoluminescence spectra of the nanoparticles.
Article
Chemistry, Multidisciplinary
Xiao Wang, Bo Wang, Hongshuai Wang, Tianyang Zhang, Huihui Qi, Zhenyu Wu, Yurong Ma, Hui Huang, Mingwang Shao, Yang Liu, Youyong Li, Zhenhui Kang
Summary: In this study, carbon dots (CDs) with green and orange emissions were fabricated and used for LED fabrication. Machine learning was utilized to predict and control the correlated color temperature of the white light emission, resulting in warm white and cold white LEDs.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2021)
Article
Chemistry, Multidisciplinary
Kaiyuan Yao, Mary S. Collins, Kara M. Nell, Edward S. Barnard, Nicholas J. Borys, Tevye Kuykendall, J. Nathan Hohman, P. James Schuck
Summary: This study examines the strongly excitonic optical properties of 2D semiconductors, specifically focusing on silver selenide monolayers. The research demonstrates the potential of utilizing multiquantum-well structures for enhancing light matter interactions and constructing optoelectronic and quantum excitonic devices. The efficient blue photoluminescence and ultrafast exciton radiative dynamics of the material highlight its promising characteristics for various applications.
Article
Chemistry, Physical
Shuaibing Wang, Yu Li, Jie Chen, Ouyang Lin, Wentao Niu, Chunhe Yang, Aiwei Tang
Summary: Quantum dot light-emitting diodes (QLEDs) have rapidly developed as a competitive alternative to cadmium-based QLEDs, utilizing indium phosphide (InP)-based quantum dots (QDs) without heavy metals. This review summarizes the properties of InP-based QDs, carrier dynamics, and the development of red, green, and blue primary color InP-based QLEDs from their first report in 2011 to the current state of the art. The effects of QD structure and device structure on the performance of InP-based QLEDs are also discussed.
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY C-PHOTOCHEMISTRY REVIEWS
(2023)
Article
Chemistry, Physical
Yiwei Shen, Wenhao Li, Kun Wang, Rong Chen, Chaoxing Wu, Xiongtu Zhou, Yongai Zhang, Yin Xiao, Suling Zhao, Tailiang Guo
Summary: The study successfully demonstrates non-carrier-injection electroluminescence (NCI-EL) from monolayer quantum dots, proposing a working mechanism related to periodic in-well ionization. The effects of driving voltage amplitude, frequency, and quantum dot size on NCI-EL performance are investigated, clarifying the ionization process.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2022)
Review
Nanoscience & Nanotechnology
Maksym F. Prodanov, Valerii V. Vashchenko, Abhishek K. Srivastava
Summary: In recent years, there has been a growing interest in quantum dots (QDs) and quantum rods (QRs) in the display and lighting industry, particularly focusing on blue-emitting nanomaterials. These materials have the potential to improve display efficiency and color saturation, but challenges such as short operational lifetimes and blue light emission still need to be addressed for further advancements.
Article
Engineering, Electrical & Electronic
Jianguo Zhao, Jiangyong Pan, Bin Liu, Tao Tao, Daihua Chen, Xianjian Long, Zhe Chuan Feng, Jianhua Chang
Summary: The optical properties of nonpolar AlGaN multiple quantum wells emitting at 280 nm were improved by reducing the densities of superficial pits and basal-plane stacking faults through carefully optimized dual nitridation. This led to a significantly improved emission and an internal quantum efficiency of 39% for nonpolar Al0.43Ga0.57N MQWs at emission wavelength of 279 nm.
IEEE PHOTONICS JOURNAL
(2021)
Review
Chemistry, Multidisciplinary
Biao Zhao, Zhan'ao Tan
Summary: This article summarizes the advances in the application of CDs in LEDs, including their roles as active emission layer and interface transport layer materials, device structure, and preparation methods. The opportunities and challenges for achieving high-performance CD-based LED devices are also discussed.
Article
Chemistry, Multidisciplinary
Chen-Min Yang, Fang-Chung Chen
Summary: Metal nanoparticles, specifically gold nanoparticles, have position effects on the performance of perovskite light-emitting diodes. The placement of the nanoparticles directly impacts the efficiency and intensity of the devices, with different layers showing varying levels of enhancement.
Article
Chemistry, Applied
M. L. Ligi, A. Abhilash, Sreekanth J. Varma, P. A. Unnikrishnan, S. Prathapan, S. Jayalekshmi
Summary: Two novel segmented block copolymers, NPPV1 and NPPV2, were synthesized and characterized for their substituent effects on properties, structure-property relationships, and suitability for polymer light emitting diodes. The study highlighted the importance of cost-effective synthesis methods in developing polymers for efficient LED design in high frequency blue emission.
Article
Chemistry, Physical
Giane B. Damas, Karl Ronnby, Henrik Pedersen, Lars Ojamae
Summary: This report investigates the reaction pathways and mechanisms involved in the crystal growth of indium nitride (InN) thin film in atomic layer deposition (ALD) techniques using trimethylindium (TMI) and ammonia (NH3) precursors. The study provides important insights for the optimization of InN film preparation.
APPLIED SURFACE SCIENCE
(2022)
Article
Chemistry, Multidisciplinary
Jiong Li, Chenghao Duan, Qiaoyun Wen, Ligang Yuan, Shibing Zou, Chang Chen, Weiguang Xie, Dongxu Lin, Christopher C. S. Chan, Kam Sing Wong, Keyou Yan
Summary: By using solution engineered perovskite nanocrystals, efficient integration of electroluminescence and photovoltaic performance in a single device has been achieved, which shows great potential for various applications.
Article
Materials Science, Multidisciplinary
Zhi-Yuan Yu, Yu-Chen Zhang, Shuai Li, Xi-Yuan Dai, Xia-Yan Xue, Hong Shen, Song -You Wang, Ming Lu
Summary: A synergistic approach of interface engineering is reported to efficiently improve the performance of silicon nanocrystal light-emitting diode (Si-NC LED). This method can significantly increase the brightness of the LED by improving charge injection and transport, and controlling the radiative recombination of the injected charges.
Article
Optics
Haiyan Zhao, Tongtong Xuan, Wenhao Bai, Haorui Dong, Guoyan Dong, Rong-Jun Xie
Summary: In this study, sky-blue DJ perovskites were synthesized using an organic diamine and high-quality perovskite films were prepared by incorporating a polymer as an additive. The resulting PeLEDs exhibited a high external quantum efficiency of 16.55%.
LASER & PHOTONICS REVIEWS
(2023)
Article
Engineering, Electrical & Electronic
Yuanjie Lv, Yuangang Wang, Xingchang Fu, Shaobo Dun, Zhaofeng Sun, Hongyu Liu, Xingye Zhou, Xubo Song, Kui Dang, Shixiong Liang, Jincheng Zhang, Hong Zhou, Zhihong Feng, Shujun Cai, Yue Hao
Summary: This article reports the first vertical beta-Ga2O3 JBS diode, which successfully addresses the issue of sacrifice of p-type beta-Ga2O3 by using p-type NiO, achieving high breakdown voltage and low ON-resistance. Experimental results demonstrate that this diode has higher performance parameters and better combinations of forward current and breakdown voltage.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2021)
Article
Chemistry, Multidisciplinary
Chenglian Zhu, Tan Nguyen, Simon C. Boehme, Anastasiia Moskalenko, Dmitry N. Dirin, Maryna I. Bodnarchuk, Claudine Katan, Jacky Even, Gabriele Raino, Maksym V. Kovalenko
Summary: All-inorganic lead-halide perovskite quantum dots have shown great potential in both classical light-emitting devices and devices exploiting strong light-matter interaction at room temperature. The study investigates the size-dependent trion and biexciton binding energies and provides insight into the multiexciton properties in these quantum dots. The findings have important implications for the development of classical and quantum optoelectronic devices.
ADVANCED MATERIALS
(2023)
Article
Physics, Multidisciplinary
Hao Zhang, Wenbin Li, Joseph Essman, Claudio Quarti, Isaac Metcalf, Wei-Yi Chiang, Siraj Sidhik, Jin Hou, Austin Fehr, Andrew Attar, Ming-Fu Lin, Alexander Britz, Xiaozhe Shen, Stephan Link, Xijie Wang, Uwe Bergmann, Mercouri G. G. Kanatzidis, Claudine Katan, Jacky Even, Jean-Christophe Blancon, Aditya D. D. Mohite
Summary: This article provides a direct visualization of the structural dynamics in monocrystalline 2D perovskites by monitoring the evolution of wavevector-resolved ultrafast electron diffraction intensity. The results show a light-induced ultrafast reduction in antiferro-distortion due to the strong interaction between the electron-hole plasma and perovskite lattice. Correlated ultrafast spectroscopy reveals that the relaxation of lattice distortion is triggered by the creation of a dense electron-hole plasma. The interaction between carrier gas and lattice can be altered by choosing an appropriate organic spacer layer.
Article
Nanoscience & Nanotechnology
Junseop Byeon, Seong Ho Cho, Junke Jiang, Jihun Jang, Claudine Katan, Jacky Even, Jun Xi, Mansoo Choi, Yun Seog Lee
Summary: Defect passivation using 2D-layered perovskites with organic spacers on 3D bulk perovskites is an effective strategy to improve stability and efficiency of perovskite solar cells. Fluorination of the organic spacers enhances hydrophobicity and defect passivation characteristics. Functional groups and conformational changes of fluorine isomers can control opto-electrical properties in layered perovskites. Synthesizing 2D perovskites with meta-CF3 and para-CF3 groups anchored to spacer molecules improves charge transport and suppresses trap states in 3D perovskites, leading to efficient charge transfers. Different orientation of functional groups results in distinct electrical properties of 2D/3D heterostructures. Structural isomers of fluorination contribute to performance and stability enhancement in perovskite solar cells.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Physical
Alla Skorokhod, Claudio Quarti, Alexandre Abherve, Magali Allain, Jacky Even, Claudine Katan, Nicolas Mercier
Summary: In this study, a series of new compounds with ABX3 structure were synthesized and characterized. The successful formation of multilayer compounds was achieved by incorporating halide spacers between the organic and inorganic components. These compounds show potential for applications in photovoltaic devices, as their optical absorption onset is around 1.71 eV, suitable for 2D/3D photovoltaic architectures.
CHEMISTRY OF MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Dmitry N. Dirin, Anna Vivani, Marios Zacharias, Taras V. Sekh, Ihor Cherniukh, Sergii Yakunin, Federica Bertolotti, Marcel Aebli, Richard D. Schaller, Alexander Wieczorek, Sebastian Siol, Claudia Cancellieri, Lars P. H. Jeurgens, Norberto Masciocchi, Antonietta Guagliardi, Laurent Pedesseau, Jacky Even, Maksym V. Kovalenko, Maryna I. Bodnarchuk
Summary: The search for nontoxic alternatives to lead halide perovskites (LHPs) has revealed that the properties of LHPs can only be achieved in their closest Sn(II) and Ge(II) analogues, despite their tendency to oxidize. A judicious choice of chemistry led to the development of formamidinium tin iodide (FASnI3) with a power conversion efficiency of 14.81% in photovoltaic devices. The synthesis of colloidal FASnI3 NCs with reduced Sn(IV) concentration allowed for the investigation of their intrinsic structural and optical properties, showing characteristics distinct from bulk FASnI3.
Correction
Multidisciplinary Sciences
Philippe Tamarat, Elise Prin, Yuliia Berezovska, Anastasiia Moskalenko, Thi Phuc Tan Nguyen, Chenghui Xia, Lei Hou, Jean-Baptiste Trebbia, Marios Zacharias, Laurent Pedesseau, Claudine Katan, Maryna I. Bodnarchuk, Maksym V. Kovalenko, Jacky Even, Brahim Lounis
NATURE COMMUNICATIONS
(2023)
Article
Materials Science, Multidisciplinary
Claudio Quarti, Giacomo Giorgi, Claudine Katan, Jacky Even, Maurizia Palummo
Summary: Layered halide perovskites are natural heterostructures with quantum and dielectric confinement that strongly affect their optical properties by stabilizing bound excitons. This study uses ab initio solution of the Bethe-Salpeter equation (BSE) to investigate the exciton properties of Cs2PbX4 (X = I and Br) models and provides theoretical insights to resolve conflicting literature reports. The simulations predict the fine-structure assignment of E-dark Ein-plane Eout-of-plane, consistent with recent magneto-absorption experiments, and observe a similar increase in dark/bright splitting from lead-iodide to lead-bromide composition as found experimentally. The authors also discuss the influence of polar distortions on exciton stabilization and the potential of halide perovskites as triplet sensitizers in combination with organic dyes.
ADVANCED OPTICAL MATERIALS
(2023)
Article
Chemistry, Physical
Zhi-Gang Li, Marios Zacharias, Ying Zhang, Fengxia Wei, Yan Qin, Yong-Qing Yang, Lian-Cai An, Fei-Fei Gao, Wei Li, Jacky Even, Xian-He Bu
Summary: The phase transitions of inorganic lead halide perovskites (ILHPs) are influenced by both harmonic and anharmonic vibrations, as revealed through lattice dynamics and multiphonon theory calculations, and verified by diffraction experiments. The study sheds light on the crucial role of harmonic vibrations in stabilizing the γ-phase of CsPbI3 and the driving force of anharmonic vibrations in the transitions between different phases of CsPbX3. These structural dynamics significantly affect the thermal conductivity and carrier relaxation, providing guidelines for manipulating the lattice dynamics of ILHPs.
ACS ENERGY LETTERS
(2023)
Article
Chemistry, Multidisciplinary
Ping Fu, Michael A. Quintero, Eugenia S. Vasileiadou, Parth Raval, Claire Welton, Mikael Kepenekian, George Volonakis, Jacky Even, Yukun Liu, Christos Malliakas, Yi Yang, Craig Laing, Vinayak P. Dravid, G. N. Manjunatha Reddy, Can Li, Edward H. Sargent, Mercouri G. Kanatzidis
Summary: This study investigates two-dimensional alloyed Pb/Sn bromide perovskites in the Ruddlesden-Popper (RP) and Dion-Jacobson (DJ) phases using butylammonium and 3-(aminomethyl)pyridinium as spacer cations. The results show that the ratio and site preference of Pb/Sn atoms are influenced by layer thickness and spacer cations. Pb-rich alloys are thermodynamically favored in n = 1 compounds. Films in the RP phase exhibit parallel orientation to the substrate, while random orientations are observed for DJ cases.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Article
Multidisciplinary Sciences
Austin M. K. Fehr, Ayush Agrawal, Faiz Mandani, Christian L. Conrad, Qi Jiang, So Yeon Park, Olivia Alley, Bor Li, Siraj Sidhik, Isaac Metcalf, Christopher Botello, James L. Young, Jacky Even, Jean Christophe Blancon, Todd G. Deutsch, Kai Zhu, Steve Albrecht, Francesca M. Toma, Michael Wong, Aditya D. Mohite
Summary: Researchers develop a conductive adhesive-barrier that enables halide perovskite-based photoelectrochemical cells to achieve record solar-to-hydrogen conversion efficiency. This advancement paves the way for efficient, durable, and low-cost solar-driven water-splitting technology.
NATURE COMMUNICATIONS
(2023)
Article
Materials Science, Multidisciplinary
Zhe Tang, Xuan Meng, Hongyuan Zhao, Sujun Ji, Qiujie Wang, Tianxin Bai, Ruiling Zhang, Junke Jiang, Claudine Katan, Jacky Even, Feng Liu
Summary: This paper presents a stable organic-inorganic hybrid indium-based metal halide BA6InCl9, which exhibits high resistance to thermal stress and humidity, paving the way for the fabrication of high-efficiency light-emitting devices.
ADVANCED OPTICAL MATERIALS
(2023)
Article
Multidisciplinary Sciences
Shangpu Liu, Mikael Kepenekian, Stanislav Bodnar, Sascha Feldmann, Markus W. Heindl, Natalie Fehn, Jonathan Zerhoch, Andrii Shcherbakov, Alexander Poethig, Yang Li, Ulrich W. Paetzold, Aras Kartouzian, Ian D. Sharp, Claudine Katan, Jacky Even, Felix Deschler
Summary: This study reveals the unique photoluminescence properties of hybrid perovskite semiconductor materials, which can achieve high luminescence yields and circularly polarized photoluminescence at room temperature. The excellent photoluminescence performance is attributed to the suppression of nonradiative loss channels and the high rates of radiative recombination. These findings pave the way for high-performance solution-processed photonic systems and chiral-spintronic logic at room temperature.
Article
Chemistry, Multidisciplinary
Pooja Basera, Boubacar Traore, Jacky Even, Claudine Katan
Summary: Understanding the relationship between surface dipoles and work functions is crucial for the performance and stability of perovskite-based devices. In this study, the interplay between surface dipoles, charge transfers, and local strain effects on a CsPbBr3 perovskite surface functionalized with dipolar ligand molecules was investigated. The results showed that the valence level can shift either upward or downward due to these factors. Furthermore, the study found that the contribution of individual molecular entities to surface dipoles and electric susceptibilities is essentially additive. Comparisons were made with conventional approaches based on a capacitor model, and insights for fine-tuning materials work functions were obtained.
Article
Materials Science, Multidisciplinary
Bruno Cucco, Claudine Katan, Jacky Even, Mikael Kepenekian, George Volonakis
Summary: A thorough investigation of the excitonic properties of vacancy-ordered halide double perovskites (VODPs) reveals critical details regarding the role of electron-hole interactions in their electronic and optical properties.
ACS MATERIALS LETTERS
(2023)
Article
Materials Science, Multidisciplinary
Marios Zacharias, George Volonakis, Feliciano Giustino, Jacky Even
Summary: In this paper, we present an approach for the treatment of anharmonicity in solids based on the self-consistent phonon theory and the special displacement method. Our method allows for efficient calculation of temperature-dependent anharmonic phonon dispersions with minimal steps for minimizing the system's free energy. The results demonstrate good agreement with experiments and previous studies, and show promise for investigating strongly anharmonic systems.
