Article
Materials Science, Multidisciplinary
Shiju Edappadikkunnummal, Nikhil Puthiya Purayil, Jaismon Francis, Abdullah G. Al-Sehemi, Mehboobali Pannipara, Remya Thundiparambil Muraleedharan, Anitta Sha Mercy, Narayana Rao Desai
Summary: Incorporating an active medium in a photonic crystal structure enables the tunability of nonlinear optical responses. By using graphene quantum dots as the active material, the band edge-assisted enhancement of optical nonlinearity in a one-dimensional polymeric photonic crystal structure is demonstrated. The slow light effect at the photonic band edge significantly improves the nonlinear absorption property and optical limiting action.
ACS APPLIED POLYMER MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Wanqing Cheng, Jianlong Zheng, Feng Zhai
Summary: This study theoretically investigates the energy spectrum and magneto-optical properties of circular and rectangular arsenene quantum dots (AQDs) using a multi-orbital tight-binding model. The density of states, probability distribution, inverse participation ratio, and optical absorption spectrum of the AQDs are calculated numerically. The results show that the edge states of the AQDs fill the bulk band gap of puckered arsenene and are localized near the armchair edges. The absorption peaks and their intensities can be tuned by changing the shape of the quantum dots and applying a magnetic field, leading to a reduction in the anisotropy ratio of light absorption under a magnetic field of tens of Tesla.
MATERIALS TODAY COMMUNICATIONS
(2023)
Article
Materials Science, Multidisciplinary
Wanqing Cheng, Feng Zhai
Summary: Recently, y-graphyne has been identified as a 2D high-order topological insulator featuring corner states. This study investigates the conditions for the existence of corner states in a hexagonal y-graphyne quantum dot (GYQD). Using a single-orbital tight-binding model, it is found that corner states only emerge when there are partially-bonding carbon atoms at the corners, indicating the potential instability of these corner states. As the size of GYQDs increases, mid-gap states in the energy spectrum are either prohibited, or manifest as corner-only or edge-only states. Furthermore, the light absorption of GYQDs exhibits relatively weak polarization anisotropy, with the presence of corner states leading to sub-gap absorption and enhanced above-gap absorption.
RESULTS IN PHYSICS
(2023)
Article
Chemistry, Physical
Sudhakar Narra, Sumit S. Bhosale, Aparna K. Kharade, Sue-min Chang, Eric Wei-Guang Diau
Summary: Femtosecond transient absorption spectral investigations were conducted to understand carrier relaxation mechanism in perovskite nanocrystals. The study found that Cs(1-x)FA(x)PbBr(3) (CF) samples exhibited slower charge recombination rates compared to CsPbBr3 (CS) samples, consistent with their photocatalytic performances.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2022)
Article
Chemistry, Multidisciplinary
Katsunori Makihara, Yuji Yamamoto, Yuki Imai, Noriyuki Taoka, Markus Andreas Schubert, Bernd Tillack, Seiichi Miyazaki
Summary: We have achieved high-density formation of super-atom-like Si quantum dots with Ge-core on ultrathin SiO2 using high-selective chemical-vapor deposition and applied them to LEDs. Luminescence measurements reveal carrier confinement and recombination properties in the Ge-core, indicating type II energy band discontinuity between the Si-clad and Ge-core. Under forward bias conditions, electroluminescence becomes observable in the near-infrared region due to radiative recombination between quantized states in the Ge-core, facilitated by a deep potential well for holes caused by simultaneous electron/hole injection from the gate and substrate. These results will lead to the development of Si-based light-emitting devices that are highly compatible with Si-ultra-large-scale integration processing, revolutionizing silicon photonics.
Review
Chemistry, Multidisciplinary
Carlo Giansante
Summary: The presence of quantum confinement effects in inorganic semiconductors leads to a high surface-to-volume ratio, making surface chemistry a powerful tool to control electronic structure. Materials prepared via colloidal synthetic procedures tend to undergo surface reactions in solution, providing an ideal framework to study the impact of surface chemistry on electronic structure. Experimental evidence shows that ligands on the surface of colloidal quantum dots induce changes in optical properties, indicating a complex interplay between ligands and the core at the atomic level.
CHEMISTRY-A EUROPEAN JOURNAL
(2021)
Article
Chemistry, Physical
Valentin Diez-Cabanes, Mariachiara Pastore
Summary: This study focuses on the factors limiting the photocatalytic performance of inorganic semiconductors and the development of visible light-driven catalysts. By controlling the size and shape of nanomaterials, the recombination rate of electron pairs can be slowed down, thereby improving photocatalytic efficiency.
JOURNAL OF PHYSICAL CHEMISTRY C
(2021)
Article
Chemistry, Physical
Lihui Liu, Junxian Piao, Yun Wang, Chenxi Liu, Jian Chen, Kun Cao, Shufen Chen
Summary: In this study, the performance of mixed chloride/bromide perovskites for blue LED fabrication was improved by introducing trichloroacetic acid as a reliable trifunctional additive. Trichloroacetic acid provided additional chloride to fill halide vacancies, passivated the uncoordinated Pb2+ ion defects, and promoted effective crystallization. The resulting pure-blue perovskite LED demonstrated stable electroluminescent spectra at 477 nm under various bias and achieved a 5-fold improvement in external quantum efficiency (up to 6.6%).
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2023)
Article
Optics
Pengfei Li, Shanshan Xue, Lu Sun, Xupeng Zong, Li An, Dan Qu, Xiayan Wang, Zaicheng Sun
Summary: Carbon dots (CDs) as an advanced fluorescent carbon nanomaterial have great potential, but the complexity of their PL mechanism and structure-function relationship poses major challenges to their development and applications. This study synthesized red emissive CDs and found that their PL mechanism is similar to DHQP, providing insights for the further development of tunable CDs.
LIGHT-SCIENCE & APPLICATIONS
(2022)
Article
Materials Science, Multidisciplinary
Minxing Yan, Lingfeng Zhou, Hongjun Tian, Guangjie Luo, Li Xu, Deren Yang, Yanjun Fang
Summary: Si-based perovskite light-emitting diodes (PeLEDs) with enhanced light extraction ratio and improved photoluminescence quantum yield (PLQY) were achieved through fine-tuning the thicknesses of the functional layers and regulating the crystallization process with an additive. The optimized devices showed a record EQE over 20% and intense radiant exitance.
ACS MATERIALS LETTERS
(2022)
Article
Chemistry, Physical
Surja Kanta Pal, Basab Bilk Kanrar, Prerna Yogeshwar, Debashis Panda
Summary: This article demonstrates a method to produce carbon quantum dots with molecular properties through manipulating solvent reactivity. The findings have important implications for understanding the origin of their emission properties.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
Article
Chemistry, Physical
Yan Zhao, Wenxiu Liu, Wei Shao, Lei Li, Ming Zuo, Jun Hu, Junfa Zhu, Hui Wang, Xiaodong Zhang
Summary: In this study, it is discovered that vanadium doping can effectively inhibit surface-state-mediated charge carrier trapping, leading to improved efficiency of photocatalytic solar energy utilization. The presence of shallow trap states induced by vanadium doping is attributed to this inhibition. These vanadium-doping-induced states can trap and release charge carriers, allowing for enhanced performance in photocatalytic molecular oxygen activation and selective aerobic oxidation of organic compounds. This work provides an effective method for suppressing surface-state-mediated charge carrier trapping in semiconductor-based photocatalysis.
JOURNAL OF MATERIALS CHEMISTRY A
(2023)
Article
Chemistry, Multidisciplinary
Guilherme Almeida, Lara van der Poll, Wiel H. Evers, Emma Szoboszlai, Sander J. W. Vonk, Freddy T. Rabouw, Arjan J. Houtepen
Summary: This study reports on the size-dependent optical properties and biexciton lifetimes of core-only InP colloidal quantum dots. The novel synthesis method allows for the production of a range of monodisperse InP quantum dots with narrow absorption and emission linewidths and high quantum yields.
Article
Chemistry, Multidisciplinary
Shuai Wan, Zhe Li, Chenjie Dai, Yangyang Shi, Zhongyang Li
Summary: Light-emitting metasurfaces offer precise light modulation and can manipulate both pumping and fluorescence light simultaneously, expanding encoding freedom. This design strategy paves the way for multiplexing optical displays, information storage, and next-generation wearable displays.
ADVANCED MATERIALS
(2023)
Article
Multidisciplinary Sciences
Go Yumoto, Hideki Hirori, Fumiya Sekiguchi, Ryota Sato, Masaki Saruyama, Toshiharu Teranishi, Yoshihiko Kanemitsu
Summary: By utilizing the multiband structure induced by strong spin-orbit coupling in lead halide perovskites, researchers have demonstrated an anomalous enhancement of exciton energy shift at room temperature. This enhancement at room temperature allows for efficient coherent optical manipulation of excitons utilizing energy states with large spin-orbit splitting, potentially opening up new possibilities for quantum state engineering and ultrafast optical modulation.
NATURE COMMUNICATIONS
(2021)
Article
Optics
G. F. Quinteiro, D. E. Reiter, T. Kuhn
Article
Physics, Multidisciplinary
G. F. Quinteiro, Ferdinand Schmidt-Kaler, Christian T. Schmiegelow
PHYSICAL REVIEW LETTERS
(2017)
Article
Physics, Condensed Matter
M. B. Farias, G. F. Quinteiro, P. I. Tamborenea
EUROPEAN PHYSICAL JOURNAL B
(2013)
Article
Physics, Condensed Matter
B. Sbierski, G. F. Quinteiro, P. I. Tamborenea
JOURNAL OF PHYSICS-CONDENSED MATTER
(2013)
Article
Materials Science, Multidisciplinary
G. F. Quinteiro, T. Kuhn
Article
Optics
Mark T. Lusk, Mark Siemens, G. F. Quinteiro
Review
Physics, Multidisciplinary
Guillermo F. Quinteiro Rosen, Pablo I. Tamborenea, Tilmann Kuhn
Summary: This review examines the research and applications of the interaction between optical vortices and condensed-matter systems. The study highlights the development in theory and experimental progress in this subfield, as well as the need to reformulate the standard theory of matter-light interaction when considering optical vortices. The review also discusses the potential applications of this interaction in various fields.
REVIEWS OF MODERN PHYSICS
(2022)
Article
Physics, Multidisciplinary
M. Holtkemper, G. F. Quinteiro, D. E. Reiter, T. Kuhn
Summary: This paper presents an efficient method to occupy the dark exciton ground state with a single short laser pulse, utilizing optical excitation with specific types of beams to access high-energy exciton states and create dark excitons in their ground state through relaxation of higher excitons.
PHYSICAL REVIEW RESEARCH
(2021)
Article
Materials Science, Multidisciplinary
M. Holtkemper, G. F. Quinteiro, D. E. Reiter, T. Kuhn
Article
Optics
D. O. Pabon, S. A. Ledesma, G. F. Quinteiro, M. G. Capeluto
OPTICA PURA Y APLICADA
(2017)
Proceedings Paper
Engineering, Electrical & Electronic
G. F. Quinteiro, D. E. Reiter, T. Kuhn
20TH INTERNATIONAL CONFERENCE ON ELECTRON DYNAMICS IN SEMICONDUCTORS, OPTOELECTRONICS AND NANOSTRUCTURES (EDISON 20)
(2017)
Article
Optics
D. O. Pabon, S. A. Ledesma, G. F. Quinteiro, M. G. Capeluto
Article
Optics
G. F. Quinteiro, D. E. Reiter, T. Kuhn
Proceedings Paper
Nanoscience & Nanotechnology
T. Kuhn, D. E. Reiter, G. F. Quinteiro
19TH INTERNATIONAL CONFERENCE ON ELECTRON DYNAMICS IN SEMICONDUCTORS, OPTOELECTRONICS AND NANOSTRUCTURES (EDISON' 19)
(2015)
Proceedings Paper
Engineering, Electrical & Electronic
Guillermo F. Quinteiro, Tilmann Kuhn
2015 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO)
(2015)