Article
Chemistry, Multidisciplinary
Biao Zhao, Huanyu Ma, Haoran Jia, Mengyun Zheng, Kunxiang Xu, Runnan Yu, Songnan Qu, Zhan'ao Tan
Summary: Two types of triphenylamine-derived solid-state emissive carbon dots (CDs) are synthesized through solvothermal treatment, exhibiting orange and yellow color. The nonplanar structure and good carrier mobility of the triphenylamine unit effectively inhibit the direct pi-pi stacking and enhance the fluorescence properties of the CDs in aggregation state. Using the CDs as single emissive layer, high-performance orange and green electroluminescent light-emitting diodes (LEDs) are fabricated, achieving high brightness, current efficiency, and low turn-on voltage. This work provides a versatile platform for the construction of novel solid-state emissive CDs with potential applications in photoelectric devices.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
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
Materials Science, Multidisciplinary
Amandeep Singh, Minh Tam Hoang, Ngoc Duy Pham, Tony Wang, Joshua Mcdonald, Qin Li, Kostya (Ken) Ostrikov, Hongxia Wang, Prashant Sonar
Summary: Halide perovskite nanocrystals can be used to address light-emission technology issues, with the help of a self-assembled carbon dots layer to balance electron and hole carriers, thus improving the stability and efficiency of LEDs.
ADVANCED MATERIALS TECHNOLOGIES
(2022)
Article
Nanoscience & Nanotechnology
Natsuko Urushihara, Tadahiko Hirai, Akansha Dager, Yuta Nakamura, Yuma Nishi, Ken Inoue, Ryo Suzuki, Makoto Tanimura, Kazuteru Shinozaki, Masaru Tachibana
Summary: Natural product-derived carbon dots have successfully achieved electroluminescence, showing great potential for applications in LEDs.
ACS APPLIED NANO MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
Ting Yuan, Fanglong Yuan, Laizhi Sui, Yang Zhang, Yunchao Li, Xiaohong Li, Zhan'ao Tan, Louzhen Fan
Summary: A study demonstrates the synthesis of hexagon-shaped carbon quantum dots (H-CQDs) with near-unity photoluminescence quantum yield (PLQY) and high electron mobility. The H-CQD-based light-emitting diodes achieved a high external quantum efficiency and a record maximum brightness. This study shows the potential of CQDs-based electroluminescent devices for display and lighting applications.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Chemistry, Multidisciplinary
Tian Gao, Shengnan Guo, Jiaojiao Zhang, Jintao Chen, Shiru Yin, Na Peng, Qun Cai, Huan Xu, Yi Liu
Summary: The synthesis of low-cost and high-efficiency multicolour emitting graphene quantum dots (GQDs) from lignin has been successfully achieved in this study. The high crystallization and single-layered structure of the synthesized GQDs were confirmed using HRTEM. By analyzing XPS and FT-IR spectra, the formation mechanism of GQDs derived from lignin at the molecular level was investigated. Furthermore, the application of multicolour-emitting GQDs derived from lignin in LEDs was demonstrated, offering a new path for converting sustainable biomass into high-value nanomaterials.
Review
Chemistry, Multidisciplinary
Yuxin Shi, Wen Su, Fanglong Yuan, Ting Yuan, Xianzhi Song, Yuyi Han, Shuyan Wei, Yang Zhang, Yunchao Li, Xiaohong Li, Louzhen Fan
Summary: Carbon dots (CDs) are emerging carbon nanomaterials with distinct characteristics that make them promising alternatives for electroluminescent light-emitting diodes (LEDs). This review provides a comprehensive overview of currently explored CDs, focusing on their key optical characteristics and design for display and lighting applications. The challenges and prospects in this field are discussed, inspiring more extensive research and practical applications of CD-based LEDs.
ADVANCED MATERIALS
(2023)
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)
Review
Chemistry, Physical
Taesoo Lee, Minhyung Lee, Hansol Seo, Minjun Kim, Beomsoo Chun, Jeonghun Kwak
Summary: This review summarizes previous studies on top-emitting device structures and discusses ways to improve the performance of top-emitting quantum dot-based light-emitting diodes (TQLEDs). The relevant theories for the optoelectrical properties of TQLEDs are introduced, and advancements in device optimization are presented. Multilateral strategies for TQLEDs to be widely applied in advanced industries are also discussed. This review aims to provide valuable insights for realizing commercial TQLEDs applicable to a broad range of applications.
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
Longshi Rao, Qing Zhang, Bin Sun, Mingfu Wen, Jiayang Zhang, Guisheng Zhong, Ting Fu, Xiaodong Niu
Summary: Using a solvent engineering strategy, full-color emissive carbon dots (CDs) were produced with excellent photoelectric properties and stable fluorescence performance. By tuning the volume ratio of water and dimethylformamide (H2O/DMF), the emission wavelengths of the CDs changed, and they exhibited stable fluorescence performance even after undergoing heating and UV light irradiation. Bright multicolor light-emitting diodes with a high color rendering index (CRI) were obtained using these CDs.
Article
Chemistry, Physical
Lianna Chen, Zhiyuan Qin, Shuming Chen
Summary: In this study, a new method has been developed to achieve high-resolution pixelated emission by controlling the thickness of transparent electrodes, resulting in a color-converting cavity that can selectively convert unpatterned quantum-dot white emission into saturated red, green, and blue emission. This method enables ultrahigh density red, green, and blue emission with a resolution of approximately 1700 pixels per inch, as well as achieving a color gamut of 111% NTSC.
Article
Chemistry, Multidisciplinary
Zhibin Wang, Naizhong Jiang, Menglong Liu, Ruidan Zhang, Feng Huang, Daqin Chen
Summary: This study demonstrates white CDs-LEDs with adjustable CCTs through the utilization of aggregation-induced emission, achieving white LEDs with different color temperatures. These LEDs exhibit excellent brightness and external quantum efficiency performance.
Article
Optics
Xiao Wang, Yurong Ma, Qingyao Wu, Zhenzhen Wang, Yichen Tao, Yajie Zhao, Bo Wang, Jingjing Cao, Hui Wang, Xiaoqing Cu, Hui Huang, Si Li, Xiaoyong Wang, Fengrui Hu, Mingwang Shao, Liangsheng Liao, Tsun-Kong Sham, Yang Liu, Zhenhui Kang
Summary: This study presents a method to prepare pure blue LEDs using O, N co-doped carbon dots, demonstrating excellent performance in terms of color purity, high external quantum efficiency, brightness, and current efficiency.
LASER & PHOTONICS REVIEWS
(2021)
Article
Chemistry, Physical
Yunhui Wu, Jiurong Li, Xiujian Zhao, Xiao Gong
Summary: In this study, nickel-doped carbon dots (Ni-CDs) with tunable fluorescence emission were successfully synthesized using a simple one-step solvothermal method. The introduction of Ni enhanced the fluorescence intensity and caused a redshift. By mixing Ni-CDs with polyvinylpyrrolidone (PVP), the self-quenching effect of solid-state fluorescence was effectively avoided. Based on this, high-performance green, yellow, and red light-emitting diodes (LEDs) were constructed, demonstrating the potential of these carbon dots for solid-state lighting applications.
Article
Chemistry, Physical
Sergey Yu. Ketkov, Sheng-Yuan Tzeng, Elena A. Rychagova, Anton N. Lukoyanov, Wen-Bih Tzeng
Summary: Metallocenes, including methylcobaltocene, play important roles in various fields of chemistry. The ionization energy and vibrational structure of (Cp ')(Cp)Co can be influenced by introducing methyl substituents. The mass-analyzed threshold ionization spectrum and DFT calculations provide accurate information about the properties and transformations of (Cp ')(Cp)Co.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2024)
Review
Chemistry, Physical
Qifeng Mu, Jian Hu
Summary: Polymer mechanochemistry has experienced a renaissance due to the rapid development of mechanophores and principles governing mechanochemical transduction or material strengthening. It has not only provided fundamental guidelines for converting mechanical energy into chemical output, but also found applications in engineering and smart devices.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2024)
Article
Chemistry, Physical
Da Hye Yang, Francesco Ricci, Fredrik L. Nordstrom, Na Li
Summary: Through systematic evaluation of the oiling-out behavior of procaine, we identified both stable and metastable liquid-liquid phase separation, and established phase diagrams to assist in rational selection of crystallization strategies.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2024)
Article
Chemistry, Physical
Vikki Anand Varma, Simmie Jaglan, Mohd Yasir Khan, Sujin B. Babu
Summary: Designing engineering structures like nanocages, shells, and containers through self-assembly of colloids is a challenging problem. This work proposes a simple model for the subunit, which leads to the formation of monodispersed spherical cages or containers. The model with only one control parameter can be used to design cages with the desired radius.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2024)
Article
Chemistry, Physical
Hainan Jiang, Yaolong He, Xiaolin Li, Zhiyao Jin, Huijie Yu, Dawei Li
Summary: The cycling lifespan and coulombic efficiency of lithium-ion batteries are crucial for high C-rate applications. The Li-ion concentration plays a crucial role in determining the mechanical integrity and structural stability of electrodes. This study focuses on graphite as the working electrode and establishes an experimental system to investigate the mechanical properties of composite graphite electrode at different C-rates. Considering the effect of Li-ion concentration in stress analysis is found to be significant.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2024)
Article
Chemistry, Physical
Zhiye Wang, Yunchuan Li, Mingjun Sun
Summary: This study investigates the influence of intramolecular pi-pi interactions on the electronic transport capabilities of molecules. By designing and analyzing three pi-conjugated molecules, the researchers observe that different pi-conjugated structures have varying effects on electron transport. The findings provide a theoretical foundation for designing single-molecule electronic devices with multiple electron channels based on intramolecular pi-pi interactions.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2024)
Article
Chemistry, Physical
Yuandong Xu, Haoyang Feng, Chaoyang Dong, Yuqing Yang, Meng Zhou, Yajun Wei, Hui Guo, Yaqing Wei, Jishan Su, Yingying Ben, Xia Zhang
Summary: Hollow MoS2 cubes and spheres were successfully synthesized using a one-step hydrothermal method with the hard template method. The hollow MoS2 cubes exhibited higher specific capacitance and energy density compared to the hollow MoS2 spheres. The symmetrical supercapacitors assembled with these hollow structures showed good performance and high capacity retention after multiple cycles. These findings suggest that controlling the pore structure and surface characteristics of MoS2 is crucial for enhancing its electrochemical properties.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2024)
Article
Chemistry, Physical
Ainhoa Oliden-Sanchez, Rebeca Sola-Llano, Joaquin Perez-Pariente, Luis Gomez-Hortiguela, Virginia Martinez-Martinez
Summary: The combination of photoactive molecules and inorganic structures is important for the development of advanced materials in optics. In this study, bulky dyes were successfully encapsulated in a zeolitic framework, resulting in emission throughout the visible spectrum.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2024)
Article
Chemistry, Physical
Miaomiao Zhang, Cunyuan Pei, Qiqi Xiang, Lintao Liu, Zhongxu Dai, Huijuan Ma, Shibing Ni
Summary: The design of a solid electrolyte interphase (SEI) plays a crucial role in improving the electrochemical performance of anode materials. In this study, lithium difluoro(oxalate)borate (LiDFOB) is used as an electrolyte additive to form a protective SEI film on Li3VO4 (LVO) anodes. The addition of LiDFOB results in a dense, uniform, stable, and LiF-richer SEI, which enhances the Li-ion storage kinetics. The generated SEI also prevents further decomposition of the electrolyte and maintains the morphology of LVO anodes during charge/discharge processes. This work demonstrates the effectiveness of LiDFOB as a multi-functional additive for LiPF6 electrolytes and provides insights into SEI construction for high-performance LVO anodes.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2024)
Article
Chemistry, Physical
B. V. Andryushechkin, T. V. Pavlova, V. M. Shevlyuga
Summary: The atomic structure of the Ag(111)-p(4 x 4)-O phase was reexamined and two phases with the same periodicity were discovered. It was demonstrated that the accepted Ag6 model is incompatible with high-resolution oxygen-sensitive STM images.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2024)
Article
Chemistry, Physical
S. L. Romo-Avila, D. Marquez-Ruiz, R. A. Guirado-Lopez
Summary: In this study, we used density functional theory (DFT) calculations to investigate the interaction between model graphene oxide (GO) nanostructures and chlorine monoxide ClO. We aimed to understand the role of this highly oxidizing species in breaking C-C bonds and forming significant holes on GO sheets. Our results showed that C-C bonds in a single graphene oxide sheet can be broken through a simple mechanism involving the dissociation of two chemically attached ClO molecules. The formation of carbonyl groups and holes on the GO surface was also observed. This study provides important insights into the degradation of carbon nanotubes and the stability of GO during the myeloperoxidase (MPO) catalytic cycle.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2024)
Article
Chemistry, Physical
Alberto Garcia-Fernandez, Birgit Kammlander, Stefania Riva, Hakan Rensmo, Ute B. Cappel
Summary: In this study, the X-ray stability of five different lead halide perovskite compositions (MAPbI3, MAPbCl3, MAPbBr3, FAPbBr3, CsPbBr3) was investigated using photoelectron spectroscopy. Different degradation mechanisms and resistance to X-ray were observed depending on the crystal composition. Overall, perovskite compositions based on the MA+ cation were found to be less stable than those based on FA+ or Cs+. Metallic lead formation was most easily observed in the chloride perovskite, followed by bromide, and very little in MAPbI3. Multiple degradation processes were identified for the bromide compositions, including ion migration, formation of volatile and solid products, as well as metallic lead. CsBr was formed as a solid degradation product on the surface of CsPbBr3.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2024)
Article
Chemistry, Physical
Timofei Rostilov, Vadim Ziborov, Alexander Dolgoborodov, Mikhail Kuskov
Summary: The shock-loading behavior of nanomaterials is investigated in this study. It is found that shock compaction waves exhibit a distinct two-step structure, with the formation of faster precursor waves that travel ahead of the main compaction waves. The complexity of the shock Hugoniot curve of the tested nanomaterial is described, and the effect of initial porosity on the compressed states is demonstrated.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2024)
Article
Chemistry, Physical
Sergey S. Nikitin, Alexander D. Koryakov, Elizaveta A. Antipinskaya, Alexey A. Markov, Mikhail V. Patrakeev
Summary: The stability of La1/3Sr2/3Fe1-xMnxO3-delta, a perovskite-type oxide, under reducing conditions is dependent on the manganese content. Increasing the manganese content leads to a decrease in stability. The behavior of iron and manganese in the oxide shows distinct differences, which can be attributed to the difference in the enthalpy of oxidation reactions. Additionally, the change in the La/Sr ratio affects the concentration of iron and manganese ions.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2024)
Article
Chemistry, Physical
Mosayeb Naseri, Shirin Amirian, Mehrdad Faraji, Mohammad Abdur Rashid, Maicon Pierre Lourenco, Venkataraman Thangadurai, D. R. Salahub
Summary: Inspired by the successful transfer of freestanding ultrathin films of SrTiO3 and BiFeO3, this study assessed the structural stability and investigated the electronic, optical, and thermoelectric properties of a group of two-dimensional perovskite-type materials called perovskenes. The findings revealed that these materials are wide bandgap semiconductors with potential application in UV shielding. Moreover, they exhibit better electrical and thermal conductivity at high temperatures, enabling efficient power generation in thermoelectric devices.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2024)