Article
Multidisciplinary Sciences
Hao Liu, Yan Fu, Ben Zhong Tang, Zujin Zhao
Summary: Improving power efficiency and reducing roll-off are crucial for the commercialization of white organic light-emitting diodes. The authors successfully construct all-fluorescence devices with an orange emitting layer sandwiched between two sky-blue emitting layers, achieving a figure-of-merit of 130.7 lm/W.
NATURE COMMUNICATIONS
(2022)
Article
Physics, Applied
Caixia Zhang, Lixuan Kan, Juqian Li, Haomiao Yu, Jinpeng Li, Kai Wang
Summary: A desirable driving force for efficient dissociation of exciton in organic bulk heterojunction photovoltaic system is greater than 0.300eV, but some nonfullerene acceptors (NFAs) based solar cells face challenges in meeting this criterion. Experimental results show that a significant singlet generation at charge transfer states can lead to photocurrent production even with a negligible driving force.
APPLIED PHYSICS LETTERS
(2021)
Article
Materials Science, Multidisciplinary
Junhua Xie, Jingwen Yao, Yanfeng Dai, Qian Sun, Dezhi Yang, Xianfeng Qiao, Dongge Ma
Summary: In this paper, high-efficiency blue organic light-emitting diodes (OLEDs) were fabricated by introducing a thin DMAC-DPS layer adjacent to the emitter. The resulting blue OLEDs showed improved turn-on voltage, efficiency, and efficiency roll-off. Further inserting phosphorescent materials in ultra-thin layers in a blue emitter allowed the fabrication of a warm white OLED with high efficiency and a high color rendering index (CRI).
JOURNAL OF MATERIALS CHEMISTRY C
(2022)
Article
Materials Science, Multidisciplinary
Peisen Yuan, Xiaomin Guo, Dongge Ma
Summary: Organic semiconductors have demonstrated spin-related magnetoconductance even without magnetic elements, leading to the emerging field of organic spintronics. Manipulating the sign of magnetoconductance is crucial for practical applications. In this study, we report the manipulation of magnetoconductance signs in organic photodiodes based on ground-state and excited-state charge-transfer interfaces. By adjusting the charge-transfer process, a low-field controlled current inverter can be achieved. Our work highlights the importance of organic charge-transfer states in controlling spin-related magneto-optoelectronic properties in organic semiconductors.
ACS MATERIALS LETTERS
(2023)
Article
Materials Science, Multidisciplinary
Peisen Yuan, Xiaomin Guo, Dongge Ma
Summary: Organic semiconductors exhibit spin-related magnetoconductance even without magnetic elements, leading to the emerging field of organic spintronics. Manipulation of the magnetoconductance sign is shown in an organic photodiode based on ground-state and excited-state charge-transfer interfaces. The ground-state charge-transfer interface presents negative magnetoconductance due to reverse intersystem crossing, allowing for the realization of a low-field controlled current inverter.
ACS MATERIALS LETTERS
(2023)
Article
Optics
Peiyu Fang, Peihao Huo, Liding Wang, Zifeng Zhao, Gang Yu, Yanyi Huang, Zuqiang Bian, Zhiwei Liu
Summary: Efficient single-emitting-layer white organic light-emitting diodes (WOLEDs) with a maximum external quantum efficiency of 15.9% and CIE coordinates of (0.33, 0.39) were demonstrated using a cerium complex and an europium complex as emitters. The electroluminescence mechanism involving direct hole capture and hindered energy transfer between the two emitters enabled a manageable doping concentration of the low-energy emitter, avoiding the limitation of low concentration in typical SEL-WOLEDs. The results suggest that d-f transition emitters have the potential to simplify energy level regulation and enhance the development of SEL-WOLEDs.
LIGHT-SCIENCE & APPLICATIONS
(2023)
Article
Materials Science, Multidisciplinary
Yang Tang, Yuan Liu, Weiming Ning, Lisi Zhan, Junqiao Ding, Maolin Yu, Hengjia Liu, Yuhan Gao, Guohua Xie, Chuluo Yang
Summary: In this study, efficient solution-processed red PhOLEDs were successfully designed and demonstrated by introducing different thermally activated delayed fluorescence (TADF) hosts, achieving a high maximum external quantum efficiency (EQE) of up to 22.2%. Additionally, TADF hosts with added hindrance units played a role in achieving low efficiency roll-off without sacrificing EQE. Furthermore, ternary-blended solution-processed PhOLEDs showed easy color tuning from red to white.
JOURNAL OF MATERIALS CHEMISTRY C
(2022)
Article
Multidisciplinary Sciences
Jian-Gong Yang, Xingyu Feng, Nengquan Li, Jiayu Li, Xiu-Fang Song, Ming -De Li, Ganglong Cui, Jingling Zhang, Chenglin Jiang, Chuluo Yang, Kai Li
Summary: In this study, a design of TADF Pd(II) complexes featuring metal-perturbed intraligand charge-transfer excited states is described, and two orange- and red-emitting complexes with high efficiencies and short lifetimes have been developed. OLEDs using these Pd(II) complexes show exceptional external quantum efficiencies and operational stability.
Article
Materials Science, Multidisciplinary
Hao Meng, Xiuqiang Wu, Yajie Ren, Jiansheng Wu
Summary: The study shows that the critical current oscillates with the exchange field and thickness of the ferromagnets when their magnetizations are antiparallel, while the critical current reaches a larger value and is hardly affected by other parameters when the magnetization at the central interface is perpendicular to that at the left and right interfaces.
Article
Chemistry, Multidisciplinary
Shinya Sugiura, Takashi Kubo, Yohei Haketa, Yuta Hori, Yasuteru Shigeta, Hayato Sakai, Taku Hasobe, Hiromitsu Maeda
Summary: Quinoidal molecules based on dipyrrolyldiketone boron complexes (QPBs) with partially conjugated pyrrole units as spin coupler were synthesized. The introduction of a benzo unit at the pyrrole beta-positions stabilized QPB, forming a closed-shell tautomer conformation with near-infrared absorption. By adding bases, the deprotonated species monoanion QPB- and dianion QPB2- were formed, showing over 1000 nm absorption and ion pairs with countercations. Ion-pairing with pi -electronic and aliphatic cations modulated the diradical properties of QPB2-, characterized by cation-dependent hyperfine coupling constants. VT NMR, ESR, and theoretical study revealed the higher stability of the singlet diradical compared to the triplet diradical.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Article
Chemistry, Multidisciplinary
Bo Zhou, Dongpeng Yan
Summary: This paper reports a new type of Zn(ii)-organic halide microcrystals with fluorescence and room-temperature phosphorescence (RTP) dual emission, which can be used as active waveguides. These waveguide systems exhibit stable structures and colorful photonic signals at extreme temperatures. By regulating the molecular self-assembly, thermally assisted spectral separation of fluorescence and RTP can be achieved.
Article
Chemistry, Physical
Matous Kratochvil, Muhammed A. Thottappali, Stanislav Lunak, Karel Pauk, David Rais, Aneta Markova, Jiri Pfleger, Ales Imramovsky, Martin Vala
Summary: Small modifications of the DPP molecular structure can lead to significant changes in its spectral and photophysical properties. Substitution of furan for thiophene in solution results in a slight blue shift and decreased Huang-Rhys factor of absorption spectra. Branching of side chains can change the slipped-stack arrangement. Time dependent density functional theory calculations on model dimers help explain the changes in absorption spectra of thin films. Solid-state luminescence is weak and dependent on excitation wavelength. Singlet fission was observed with different yields for various pi-stacked structures. The shape of triplet-triplet absorption spectra is also influenced by pi-stacking. The discussion focuses on the different mixing of Frenkel and charge transfer states in model dimers and the different excitonic and electronic coupling in the pi-stacks.
Article
Materials Science, Multidisciplinary
Xing Chen, Aziz Khan, Sheng-Nan Zou, Yun Li, Qi-Sheng Tian, Cheng Zhong, Man-Keung Fung, Zuo-Quan Jiang, Liang-Sheng Liao
Summary: Two novel TADF molecules, designed and synthesized through through-bond charge transfer and through-space charge transfer, showed similar emission properties in dilute solution. SFCCNO can form dimers at the aggregation state and exhibit intermolecular emission properties.
JOURNAL OF MATERIALS CHEMISTRY C
(2021)
Article
Chemistry, Physical
A. I. Shushin
Summary: In this study, the manifestation of diffusion-controlled TTA in the kinetics of SF in molecular organic semiconductors is analyzed. The short-time and long-time parts of the SF kinetics are assumed to be governed by geminate and bimolecular TTA, respectively. An analytical formula is derived to accurately describe the experimental SF kinetics over a wide range of times.
CHEMICAL PHYSICS LETTERS
(2023)
Review
Biochemistry & Molecular Biology
Joanna Stoycheva, Julia Romanova, Alia Tadjer
Summary: Singlet fission, a process of multiple exciton generation, has the potential to revolutionize solar cell technologies. Researchers are focusing on deciphering the mechanism and designing materials for this process.
Article
Chemistry, Multidisciplinary
Baipeng Yin, Hao Jia, Rui Chen, Qingda Chang, Jiangang Feng, Hanfei Gao, Yuchen Wu, Lei Jiang, Chuang Zhang
Summary: In this study, a magnetic-field-assisted approach was developed to achieve programmable assemblies of organic microcrystals with precise control over their shapes and orientations. This method has potential applications in information encryption, allowing programmable encryption, decryption, and erasure of multilevel information based on microcrystal assemblies.
ADVANCED MATERIALS
(2022)
Article
Chemistry, Physical
Wubin Wu, Xiaomeng Guo, Chenghu Dai, Zeyang Zhou, Hongxia Sun, Yeteng Zhong, Hua Sheng, Chuang Zhang, Jiannian Yao
Summary: The generation of reactive oxygen species (ROS) in photodynamic therapy (PDT) can be effectively enhanced under an external magnetic field modulation, leading to increased cancer cell death. Specifically, spin precession in radical ion pairs facilitates the production of O-2(center dot-) at low field, while spin splitting in encounter complex benefits the production of O-1(2) species at high field.
JOURNAL OF PHYSICAL CHEMISTRY B
(2022)
Article
Chemistry, Physical
Pengfei Jin, Zeyang Zhou, Hong Wang, Jinjie Hao, Rui Chen, Jingying Wang, Chuang Zhang
Summary: This study shows that using copper acetate as a spin sensitizer can facilitate the reverse intersystem crossing process and enhance electroluminescence in thermally activated delayed fluorescence-exciplex organic light-emitting diodes (OLEDs). Coordination interaction between copper acetate and exciplex molecules causes significant changes in photoluminescence intensity and lifetime. Additionally, magneto-photoluminescence studies reveal that the addition of copper acetate promotes spin conversion in the reverse intersystem crossing process.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2022)
Article
Chemistry, Physical
Huitian Du, Qian Zhou, Yuan Yu, Chenghao Liu, Jing Li, Chuang Zhang, Ziwu Ji, Zhiyong Pang
Summary: The down-and upconverted fluorescence of organic light-emitting materials composed of an electron donor-acceptor host and fluorescent guests was investigated. The effective Forster resonance energy transfer process successfully suppressed the energy loss mechanism, resulting in high photoluminescence quantum yield and strong upconverted fluorescence. These low-cost materials have great potential in applications such as light-emitting devices, lasers, and bioimaging.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
Article
Chemistry, Multidisciplinary
Chenghu Dai, Hao Jia, Wubin Wu, Baipeng Yin, Hong Wang, Ling Wang, Yeteng Zhong, Zihua Wang, Chuang Zhang, Jiannian Yao
Summary: The integration of a bio-machine interface that can trigger and monitor activities in biosystems using an organically modified silicate composite coating was demonstrated. The coated ultrathin fibers were able to trigger and monitor intracellular metabolism activities in living cells. The findings suggest that this new bio-machine interface holds potential for studying intracellular behaviors and drug stimulations.
Article
Chemistry, Multidisciplinary
Xianqing Lin, Wu Zhou, Yingying Liu, Fang-Jie Shu, Chang-Ling Zou, Chunhua Dong, Cong Wei, Haiyun Dong, Chuang Zhang, Jiannian Yao, Yong Sheng Zhao
Summary: This article introduces a method of using femtosecond laser direct writing technique to fabricate 3D topological Mobius microring resonators and their application in photon manipulation. Unlike traditional resonators, the topological Mobius microring resonator can output laser signals with all polarization states, representing an important advancement in 3D topological photonics.
Article
Chemistry, Multidisciplinary
De-Hui Tuo, Shuxuan Tang, Pengfei Jin, Jikun Li, Xinping Wang, Chuang Zhang, Yu-Fei Ao, Qi-Qiang Wang, De-Xian Wang
Summary: This article presents the synthesis, crystal structures, and physical properties of novel benzene triimide (BTI) radical anions, focusing on the relationship between molecular structure, spin-spin intermolecular interactions, and physical properties in the crystalline state. The radical species exhibited diverse intermolecular stackings in the crystalline state, resulting in different spin-spin interactions and various physical properties. The structure-property relationship was studied in terms of magnetism and conductivity, showing that the radical pi-pimers and pi-stacks with effective charge transport exhibited paramagnetic property and conductivity at room temperature.
Article
Multidisciplinary Sciences
Baipeng Yin, Jie Liang, Jinjie Hao, Chenghu Dai, Hao Jia, Hong Wang, Desong Wang, Fang-Jie Shu, Chuang Zhang, Jianmin Gu, Yong Sheng Zhao
Summary: By using the strategy of liquid-phase nonconfinement growth, edge-curved molecular microcrystals can be synthesized controllably on a large scale. Varying the molecular substituents allows for the exposure of high-index crystal planes, and the growth rate of these planes can be regulated by increasing the molecular supersaturation. The resulting edge-curved microcrystals support low-threshold lasing and self-focusing directional emission, making them promising for applications in integrated photonic devices and circuits.
Article
Chemistry, Multidisciplinary
Baipeng Yin, Hao Jia, Hong Wang, Rui Chen, Lixin Xu, Yong Sheng Zhao, Chuang Zhang, Jiannian Yao
Summary: This study demonstrates a facile and reliable method to fabricate organic microlaser pixels, achieving reconfigurable microsphere arrays. This approach offers high spatial precision and rapid temporal response, enabling low-threshold microlasers with tunable optical resonance modes and polarization.
Article
Chemistry, Multidisciplinary
Zeyang Zhou, Rui Chen, Pengfei Jin, Jinjie Hao, Wubin Wu, Baipeng Yin, Chuang Zhang, Jiannian Yao
Summary: Interface exciplex is a promising host material for OLEDs with barrier-free charge injection and highly confined recombination region. However, the efficiency of radiative recombination in pristine exciplex is low and needs improvement. In this study, interface exciplex OLEDs doped with fluorescence, phosphorescence, and TADF emitters were fabricated to investigate their excited-state properties and electroluminescence efficiencies. The results showed that TADF emitter achieved a maximum external quantum efficiency of 20%, almost 100% exciton utilization, and outperformed fluorescence and phosphorescence emitters. Optical spectroscopy and magneto-electroluminescence method revealed the advantages of TADF emitter in interface exciplex host, including its large dipole and reverse intersystem crossing. These findings provide insights for designing high-performance emitters in exciplex host materials.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Shijie Xie, Chaoyuan Deng, Qing Huang, Chuang Zhang, Chuncheng Chen, Jincai Zhao, Hua Sheng
Summary: A pi-pi stacking hybrid photocatalyst was developed by combining g-C3N4 and Cu-porphyrin MOF. This catalyst showed unprecedented ability to catalytically reduce CO2 to CO and CH4 in the presence of O2. The hydroxylated Cu node in the MOF was crucial for CO2 reduction, which was not affected by the presence of O2.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Chemistry, Multidisciplinary
Zhenzhen Zhang, Li Li, Chaoying Xu, Pengfei Jin, Miaofei Huang, Yawen Li, Hong Wang, Yuanping Yi, Chuang Zhang, Ye Yang, Weigao Xu, Yuze Lin
Summary: The translation of the paragraph is as follows: Typical organic photovoltaic semiconductors usually have high exciton binding energy, hindering the development of organic solar cells. However, by substituting selenium, the exciton binding energy in Y6Se film is reduced, leading to improved efficiency and thermal stability in single photovoltaic material solar cells.
CELL REPORTS PHYSICAL SCIENCE
(2022)
Article
Chemistry, Multidisciplinary
De-Hui Tuo, Shuxuan Tang, Pengfei Jin, Jikun Li, Xinping Wang, Chuang Zhang, Yu-Fei Ao, Qi-Qiang Wang, De-Xian Wang
Summary: In this study, we presented the efficient syntheses, crystal structures, and physical properties of a series of novel benzene triimide (BTI) radical anions, and emphasized the relationship between molecular structure with spin-spin intermolecular interactions and physical properties in the crystalline state.
Article
Materials Science, Multidisciplinary
Rui Chen, Wu Zhou, Yanjun Gong, Zeyang Zhou, Hong Wang, Chenghu Dai, Yong Sheng Zhao, Yanke Che, Chuang Zhang, Jiannian Yao
Summary: This study demonstrates the successful accumulation of highly luminescent excitons in a twisted donor-acceptor molecule, leading to improved efficiency in optically pumped lasing and electrically injected luminescence.
JOURNAL OF MATERIALS CHEMISTRY C
(2022)
Article
Engineering, Electrical & Electronic
Zheming Chen, Min Wang, Baipeng Yin, Chenghu Dai, Chuang Zhang
Summary: The study presents a simple method for fabricating phase-pure layered perovskite films, which exhibit enhanced detection capability and stability when used as active layers in photodetectors.
ACS APPLIED ELECTRONIC MATERIALS
(2022)
