Article
Chemistry, Multidisciplinary
Chokchai Kaiyasuan, Pongsakorn Chasing, Phattananawee Nalaoh, Praweena Wongkaew, Taweesak Sudyoadsuk, Kanokwan Kongpatpanich, Vinich Promarak
Summary: Two deep-blue emissive molecules (SAF-PI and SAF-DPI) designed and synthesized with twisted D-A and A-D-A structures exhibit hybridized local excited and charge transfer characteristics, suitable for use as non-doped emitters in OLEDs. SAF-PI, in particular, achieves high-definition television standard blue emission with peak wavelength at 428 nm and excellent external quantum efficiency.
CHEMISTRY-AN ASIAN JOURNAL
(2021)
Article
Optics
Slawomir Kula, Przemyslaw Krawczyk, Michal Filapek, Anna M. Maron
Summary: This study presented the synthesis and physicochemical properties of three phenanthro[9,10-d]imidazole derivatives with N-donor substituents. The compounds exhibited high thermal stability, reversible oxidation processes, and high quantum yields in various solvents. The research also included detailed theoretical considerations on their properties.
JOURNAL OF LUMINESCENCE
(2021)
Article
Engineering, Electrical & Electronic
Heng Yu, Junsheng Yu, Shanyong Chen, Youwei Guan, Lu Li
Summary: A novel phenanthro[9,10-d]imidazole-zinc coordination complex (Zn(TPPI)(2)) was reported in this work, displaying favorable properties for a host material such as suitable HOMO energy level, small singlet-triplet splitting, and good thermal stability. Utilizing Zn(TPPI)(2) as host, yellow-red and red phosphorescent devices showed high efficiencies, and undoped device of Zn(TPPI)(2) also demonstrated good performance in zinc-complex blue emitters. These results indicate that Zn(TPPI)(2) is a promising blue emitter and host material.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2021)
Article
Chemistry, Multidisciplinary
Xiangyang Tang, Hui Liu, Futong Liu, Xin He, Xuehui Xu, Jianwu Chen, Qiming Peng, Ping Lu
Summary: Efficient red emitters based on phenanthro[9,10-d]imidazole-naphtho[2,3-c][1,2,5]thiadiazole donor-acceptor derivatives were reported in this study, demonstrating high photoluminescence quantum yield (PLQY) in doped films and relatively high PLQY in neat films. These emitters showed efficient red electroluminescence (EL) in doped devices with a maximum external quantum efficiency (EQE) of 6.96% and 5.92%, respectively.
CHEMISTRY-AN ASIAN JOURNAL
(2021)
Article
Chemistry, Applied
Slawomir Kula, Przemyslaw Ledwon, Anna M. Maron, Mariola Siwy, Justyna Grzelak, Marcin Szalkowski, Sebastian Mackowski, Ewa Schab-Balcerzak
Summary: In this study, four new 1-phenyl-1H-phenanthro[9,10-d]imidazole derivatives containing N-donor substituents at the C2 position were synthesized and characterized by high thermal stability and photoluminescence quantum yields. Their thermal, electrochemical, spectroelectrochemical, and optical properties were investigated. Additionally, their electroluminescent ability was preliminarily tested.
Review
Chemistry, Multidisciplinary
Gleiston G. Dias, Marieli O. Rodrigues, Esther R. S. Paz, Mateus P. Nunes, Maria H. Araujo, Fabiano S. Rodembusch, Eufranio N. da Silva Junior
Summary: Fluorescent and colorimetric sensors are important tools for investigating chemical compositions of different matrices. These sensors have high sensitivity, low interference, and low detection limits, inspiring research in ion and molecule detection. This Review focuses on phenanthro[9,10-d]imidazoles, discussing different strategies for obtaining them and their optical properties when interacting with specific analytes.
Article
Materials Science, Multidisciplinary
Siyu Hou, Yan Guo, Tiezheng Miao, Guorui Fu, Wentao Li, Jiaxiang Liu, Baowen Wang, Xingqiang Lu, Lin Liu, Weixu Feng
Summary: By molecular design, a new phenanthro[9,10-d]imidazole-based compound was synthesized, which exhibited strong emissive properties at 462 nm and showed a unique fluorescent turn-off for Cu2+ ion with a low detection limit. This study suggests that the phenanthro[9,10-d]imidazole-derivative could serve as a selective fluorescence and visual sensor platform for Cu2+ ion.
Article
Engineering, Environmental
Yang Cheng, Qiang Fu, Xueping Zong, Yixin Dong, Wenhua Zhang, Quanping Wu, Mao Liang, Zhe Sun, Yongsheng Liu, Song Xue
Summary: A new HTM (PI-2) was proposed to improve the performance of perovskite solar cells (PSCs), achieving high efficiency conversion in both types of structured cells through rational design. This HTM exhibits enhanced molecular interactions and hole mobility, leading to improved performance of PSCs.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Chemistry, Physical
Huixue Li, Xiaofeng Wang, Kun Yuan, Lingling Lv, Zhifeng Li
Summary: This study investigates the thermally activated delayed fluorescence phenomenon of a near-infrared molecule in various environments using first-principles methods and QM/MM technique. The results show the significant impact of surrounding effects on the photophysical properties of the compound, highlighting the importance of considering environmental factors in the design of novel TADF materials. Additionally, an optimally tuned range-separated functional is proposed for simulating excited states with good agreement with experimental values.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2021)
Article
Chemistry, Organic
Bastian L. Springer, Kristina Holzschneider, Fabian Mohr, Stefan F. Kirsch
Summary: A new synthetic route for phenanthro[9,10-d]imidazoles is reported. The target compounds were synthesized through the aminolysis of readily accessible 10,10-diazidophenanthren-9(10H)-one with nucleophilic amines, followed by a self-condensation. X-ray single crystallography was used to determine the molecular structures, and the optical properties of the material were described.
SYNTHESIS-STUTTGART
(2023)
Article
Materials Science, Multidisciplinary
Khurram Usman, Amjad Islam, Syed Hamad Ullah Shah, Kashif Javaid, Al Amin, Zeeshan Mustafa, Abdul Ghafar Wattoo, Nadeem Abbas, Ziyi Ge
Summary: A new deep-blue light-emitting material, TPA-PyI, is developed for OLEDs by merging different unit structures, exhibiting good emission performance and thermal stability.
Article
Chemistry, Physical
Patrick Enders, Michal Majek, Chiu Marco Lam, R. Daniel Little, Robert Francke
Summary: Despite the similarities between photo- and electrocatalysis, the exchange of mediators is rare. This article presents a systematic approach to utilizing electrochemical mediators for photocatalysis, using the phenanthro[9,10-d]-imidazole framework as an example. By adjusting the mediator properties, a broader platform is accessible for both oxidative and reductive transformations.
Article
Chemistry, Multidisciplinary
Li Anran, Zhao Bing, Kan Wei, Song Tianshu, Kong Xiangdong, Bu Fanqiang, Sun Li, Yin Guangming, Wang Liyan
Summary: The newly designed and synthesized symmetric fluorescent probe PIP-ph-PIP has a low detection limit, can selectively recognize different ions, and achieve continuous observation through colorimetry. This probe has been successfully applied to detect ions in living cells and quantify ions in water samples.
CHEMICAL JOURNAL OF CHINESE UNIVERSITIES-CHINESE
(2021)
Article
Materials Science, Multidisciplinary
Guo-Xi Yang, Deng-Hui Liu, Qing Gu, Xiaomei Peng, De-Li Li, Mengke Li, Ming Liu, Jie Chen, Kunkun Liu, Shi-Jian Su
Summary: The utilization of triplet excitons is important for organic light-emitting diodes (OLEDs), and triplet-triplet annihilation (TTA) is an effective method for achieving high efficiency deep-blue organic emitters. This study demonstrates that by using two deep-blue emitters with efficient spin-orbit interactions, approximately 35% of radiative singlet excitons (RSE) can be achieved through the TTA process, resulting in improved external quantum efficiencies for OLEDs.
ADVANCED OPTICAL MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Hyukmin Kwon, Seokwoo Kang, Sunwoo Park, Sangshin Park, Seyoung Oh, Yuna Kang, Jongwook Park
Summary: This article presents the synthesis and characterization of new blue organic emitter materials. These materials exhibit high absorption and emission peaks, as well as good photoluminescence quantum yield. Application in organic light emitting diodes shows that these materials have high current efficiency and quantum efficiency.
MOLECULAR CRYSTALS AND LIQUID CRYSTALS
(2022)
Article
Mechanics
Panding Wang, Jiawei Wen, Hongshuai Lei, Baosheng Xu, Yang Liu, Le Yang, Daining Fang
Summary: By combining high and low resolution ?CT scans, this study successfully monitored the 3D geometric morphology and deformation fields of SCFRP composites under different tension states, and determined the influence of micro geometric morphology on material fracture behavior.
COMPOSITE STRUCTURES
(2021)
Article
Electrochemistry
Yikun Wu, Shengxin Zhu, Zenghui Wang, Peijun Zhou, Fuguo Xie, Jiang Zhou, Hao-Sen Chen, Wei-Li Song, Daining Fang
Summary: This study focuses on the strain of the steel case during operation of 18650 Li-ion battery cells, revealing an inhomogeneous strain distribution issue after long-term cycling. It is identified that the gap between the jelly roll and steel case is the root cause of different strain distribution on the steel case. It is suggested to pay attention to the gap in the engineering design of cylindrical Li-ion battery cells with next-generation silicon composite electrode.
ELECTROCHIMICA ACTA
(2021)
Article
Engineering, Mechanical
Zhiwen Ren, Longtao Ji, Ran Tao, Mingji Chen, Zhishuai Wan, Zeang Zhao, Daining Fang
Summary: This work proposes a method of creating geometrically reconfigurable and mechanically tunable multi-stable metamaterials to realize a kind of tunable elastic metamaterial with a stable state during the active regulation without continuous-consuming energy based on 4D printing technology. The tunable elastic metamaterial can adjust the starting/ending frequencies, broaden the frequency ranges of bandgaps and control the elastic wave propagation. The method can be used in vibration-isolated steady-state adjustable equipment and smart wave device, and a bi-stable logic-gate elastic metamaterial is implemented to correctly execute simple wave logic operations.
EXTREME MECHANICS LETTERS
(2021)
Article
Engineering, Mechanical
Le Yang, Na Li, Likun Hu, Shaoqi Wang, Lin Wang, Jiang Zhou, Wei-Li Song, Lei Sun, Tai-Song Pan, Hao-Sen Chen, Daining Fang
Summary: A novel in-situ temperature sensing framework is proposed in this study, incorporating temperature sensors with a signal transmission solution to transmit internal measurements outside batteries without interfering their normal state. Extensive experimental results validate the effectiveness of this framework, showing promising potential for in-situ battery health monitoring and promoting the development of smart batteries.
ACTA MECHANICA SINICA
(2021)
Article
Chemistry, Physical
Yixing Huang, Dong Wu, Mingji Chen, Kai Zhang, Daining Fang
Summary: A glass fiber/carbon fiber reinforced honeycomb metastructure with wide absorption bandwidth and high mechanical strength was designed and fabricated, successfully integrating electromagnetic absorption and mechanical resistance.
Article
Materials Science, Multidisciplinary
P. Wang, K. F. Wang, B. L. Wang, L. Xi, K. Sano, T. Shimada, H. Hirakata, D. N. Fang
Summary: This study aims to stably and accurately measure the interlaminar fracture toughness (IFT) of multilayered Bi2Te3 for evaluating the reliability of its thermoelectric devices. By developing a tapered cantilever bending (TCB) experiment, the measurement of IFT for Bi2Te3 was successfully achieved, providing a new method for assessing multilayered materials.
EXPERIMENTAL MECHANICS
(2022)
Article
Materials Science, Composites
Qiubo Li, Yihui Chen, Yanfei Chen, Shigang Ai, Daining Fang
Summary: This study aims to investigate the effect of void defects on the failure behavior and strength of C/SiC composites. Micro-computed tomography and finite element models were used to study the influence of void volume fractions and geometry on the materials. This research is important for better understanding the impact of defects on the mechanical behavior of composite materials.
APPLIED COMPOSITE MATERIALS
(2022)
Article
Mechanics
Xiaofei Cao, Haoming Yang, Xianben Ren, Wenwang Wu, Li Xi, Ying Li, Daining Fang
Summary: In this study, the impact of defects originated from the P mu SL process on the compressive mechanical properties and deformation modes of micro gyroid cylinder shell structures were examined through experimental tests and numerical simulations. Testing results showed that the fabricated thickness value significantly affected the mechanical properties of the structures. A reconstructed 3D true model based on 2D tomography images was proposed, with simulation results indicating better consistency with experimental results compared to an ideal model.
COMPOSITE STRUCTURES
(2021)
Article
Mechanics
Dong Wu, Zeang Zhao, Hongshuai Lei, Hao-Sen Chen, Qiang Zhang, Panding Wang, Daining Fang
Summary: Natural tissues can self-strengthen through biological growth, while synthetic materials are typically static. The concept of bio-inspired materials aims to develop materials with dynamically programmable performances. A solvent-free elastomer composite system is proposed in this study, which can be strengthened through tunable self-growth cycles and is compatible with Digital Light Processing (DLP) 3D printing for fast manufacturing of high-precision structures.
COMPOSITE STRUCTURES
(2022)
Article
Engineering, Multidisciplinary
Huimin Li, Baosheng Liu, Lei Ge, Yi Chen, Huayong Zheng, Daining Fang
Summary: This study investigates the mechanical performance of continuous carbon fiber reinforced PLA composites printed in vacuum. Special 3D printing equipment and raw material production devices are utilized to improve impregnation effect, reduce porosity, and increase flexural strength and modulus. Research shows that printing temperature positively influences mechanical properties, while printing speed and layer thickness have negative effects.
COMPOSITES PART B-ENGINEERING
(2021)
Article
Materials Science, Composites
Chunwang He, Jingran Ge, Xiaofei Cao, Yanfei Chen, Haosen Chen, Daining Fang
Summary: Manufacturing uncertainties in composites, such as carbon fiber deviations and voids, can impact mechanical properties. Although experiments have been conducted, quantitative characterization of fiber radius and shape deviations, and matrix void content, remain a challenge. A computational micromechanics study was conducted to understand the effects of manufacturing uncertainties on the mechanical behavior of UD composites under different loading conditions. The methodology involved establishing constitutive laws for constituents, modeling RVEs with deviations based on observations, and predicting stress-strain curves and failure modes.
COMPOSITES SCIENCE AND TECHNOLOGY
(2022)
Article
Materials Science, Ceramics
Yanfei Chen, Shigang Ai, Pan Wang, Daining Fang
Summary: A physically based constitutive model for braided silicon carbide ceramic matrix composites (CMCs-SiC) at ultra-high temperature is developed, considering material orthotropy, temperature effect, tension-compression asymmetry, and crack closure effect. The model, implemented using a return mapping algorithm, shows good agreement with experimental data in predicting stress-strain relationships at different stress states and temperatures.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2022)
Review
Chemistry, Multidisciplinary
Jixiang Qi, Zihao Chen, Peng Jiang, Wenxia Hu, Yonghuan Wang, Zeang Zhao, Xiaofei Cao, Shushan Zhang, Ran Tao, Ying Li, Daining Fang
Summary: Active mechanical metamaterials combine mechanical metamaterials with smart materials for superior performance, with structures designed based on principles such as phase transition and strain mismatch. External stimuli like temperature, chemicals, and light are used for control and efficiency.
Article
Multidisciplinary Sciences
Handong Jiao, Zhaoliang Qu, Shuqiang Jiao, Yang Gao, Shijie Li, Wei-Li Song, Haosen Chen, Hongmin Zhu, Rongqi Zhu, Daining Fang
Summary: High-temperature electrochemistry is widely used but real-time observations and in-depth understanding of its evolution are limited. In this study, a high-temperature electrolysis facility with in situ x-ray computer microtomography was developed to probe the dynamic evolution of electrodes. The results provide insights into the efficiency and mechanisms of the process, as well as real-time optimization.
Review
Engineering, Mechanical
Daining Fang, Weiguo Li, Tianbao Cheng, Zhaoliang Qu, Yanfei Chen, Ruzhuan Wang, Shigang Ai
Summary: This article reviews the mechanical properties of materials in ultra-high-temperature environments, discussing experimental results, constitutive models, and thermal-mechanical-oxygen coupled computational mechanics. Recent research progress on the temperature-dependent fracture strength of advanced ceramics is highlighted, with emphasis on the force-heat equivalence energy density principle. The outlook and concluding remarks are also discussed.
ACTA MECHANICA SINICA
(2021)