Article
Chemistry, Physical
Wenbo Ma, Yirong Su, Qisheng Zhang, Chao Deng, Luca Pasquali, Wenjuan Zhu, Yue Tian, Peng Ran, Zeng Chen, Gaoyuan Yang, Guijie Liang, Tianyu Liu, Haiming Zhu, Peng Huang, Haizheng Zhong, Kangwei Wang, Shaoqian Peng, Jianlong Xia, Huafeng Liu, Xu Liu, Yang (Michael) Yang
Summary: X-ray detection relies on inorganic scintillators, but using thermally activated delayed fluorescence molecules as scintillators can significantly increase efficiency and imaging quality, showing the importance of efficient harvesting of triplet excitons under X-ray excitation.
Article
Chemistry, Inorganic & Nuclear
Anitha S. Gowda, Tia S. Lee, Michael C. Rosko, Jeffrey L. Petersen, Felix N. Castellano, Carsten Milsmann
Summary: This article reports the synthesis of three stable group 14 compounds that can access long-lived triplet excited states using their significant spin-orbit coupling constants. These compounds exhibit efficient photoluminescence properties with competing prompt fluorescence and thermally activated delayed fluorescence at and around room temperature.
INORGANIC CHEMISTRY
(2022)
Article
Materials Science, Multidisciplinary
Yaxun Wu, Fan Ni, Zhanxiang Chen, Wei Yang, Yepeng Xiang, Shaolong Gong, Xiaosong Cao, Chuluo Yang
Summary: In this study, two donor-acceptor-type TADF emitters with highly twisted conformation are synthesized. Through various experiments and analysis, it is discovered that X-aggregation supports aggregation-induced emission behavior, while H-aggregation leads to aggregation-caused quenching.
ADVANCED OPTICAL MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Seja A. Elgadi, Don M. Mayder, Ryoga Hojo, Zachary M. Hudson
Summary: Structural constraint is an emerging strategy for improving the properties of luminescent materials, and in this report, planarized donor sulfidotetramethyazatriangulene (SMAT) is utilized to achieve emitters displaying thermally activated delayed fluorescence (TADF) for the first time. The enhanced rigidity of SMAT contributes to improved color purity and photoluminescence quantum yield, and SMAT-based emitters also offer a tenfold enhancement in two-photon absorption cross-section compared to analogous materials. This work demonstrates that SMAT and its S-oxides can be used to design high-performance luminescent materials with emergent properties.
ADVANCED OPTICAL MATERIALS
(2023)
Article
Engineering, Environmental
Zhengqi Xiao, Nengquan Li, Wei Yang, Zhongyan Huang, Xiaosong Cao, Taian Huang, Zhanxiang Chen, Chuluo Yang
Summary: This study developed three new luminogens with aggregation-induced enhanced emission and ultralong room temperature phosphorescence properties. Among them, 5-Cz-Sac exhibited stronger intermolecular non-covalent interactions leading to outstanding RTP performance, while DiCz-Sac showed characteristics of thermally activated delayed fluorescence in addition to AIEE and RTP.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Materials Science, Multidisciplinary
Yaguang Wang, Qikun Sun, Lingtai Yue, Jie Ma, Shou Yuan, Danfeng Liu, Haichang Zhang, Shanfeng Xue, Wenjun Yang
Summary: This study successfully synthesized organic crystals with ultralong room-temperature white light emission, which exhibits non-discoloring white afterglow with high photoluminescence efficiency. The crystal can be excited at wide wavelengths and shows unique luminescent properties.
ADVANCED OPTICAL MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
Shuai Li, Liyuan Fu, Xiaoxiao Xiao, Hua Geng, Qing Liao, Yi Liao, Hongbing Fu
Summary: By controlling the excited-state dynamics, the TADF and RTP emissions of a boron difluoride beta-acetylnaphthalene chelate (beta CBF2) have been successfully regulated, resulting in two crystalline polymorphs emitting green and red light, respectively.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2021)
Article
Nanoscience & Nanotechnology
Renjie Chen, Yan Guan, Hailong Wang, Yan Zhu, Xin Tan, Ping Wang, Xueye Wang, Xinghe Fan, He-Lou Xie
Summary: In this study, a series of organic compounds with twisted electron donor-acceptor structures were successfully designed and synthesized, and then dissolved in MMA to realize single-molecular organic room-temperature phosphorescent materials with long lifetime. When grown into single crystals, multicolor-tunable afterglow was achieved at different delay times, showing promising applications in high-level anticounterfeiting.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Chemistry, Multidisciplinary
Kun Liu, Shuai Li, Liyuan Fu, Yilong Lei, Qing Liao, Hongbing Fu
Summary: This study develops two charge-transfer cocrystals and achieves thermally activated delayed fluorescence and room-temperature phosphorescence emission by modulating molecular structures. Experimental and theoretical results reveal the effects of CT interactions and lone-pair electrons from bromine atoms on excited-state processes.
Article
Chemistry, Multidisciplinary
Weimin Ning, Han Wang, Shaolong Gong, Cheng Zhong, Chuluo Yang
Summary: Polycyclic aromatic heterocycles with multi-resonance thermally activated delayed fluorescence (MR-TADF) have attracted considerable attention in the field of organic optoelectronics due to their narrowband emission and high quantum efficiencies. In this study, a simple polycyclic aromatic heterocycle, BTPT, was successfully constructed, which exhibited ultraviolet emission at 368 nm with a narrow full width at half maximum (FWHM) of 33 nm. The BTPT film showed distinct TADF property and demonstrated significant circularly polarized luminescence (CPL) and room temperature phosphorescence (RTP).
SCIENCE CHINA-CHEMISTRY
(2022)
Article
Chemistry, Inorganic & Nuclear
Chun-Hua Huang, Mingxue Yang, Xu-Lin Chen, Can-Zhong Lu
Summary: This study investigated the emissive properties of three Cu(I) complexes and successfully tuned the emission characteristics by changing the ligands' structures.
DALTON TRANSACTIONS
(2021)
Article
Chemistry, Multidisciplinary
Peng-Yan Fu, Bao-Ning Li, Qiang-Sheng Zhang, Jun-Ting Mo, Shi-Cheng Wang, Mei Pan, Cheng-Yong Su
Summary: In this study, a coordination polymer with ESIPT properties was synthesized, and the switching between thermally activated fluorescence and long persistent luminescence was achieved by controlling the temperature. The mechanism of ISC/RISC energy transfer in the coordination polymer was revealed, providing a new pathway for the design and application of advanced optical materials in the future.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2022)
Article
Engineering, Environmental
Melika Ghasemi, Malek Mahmoudi, Dalius Gudeika, Karolis Leitonas, Jurate Simokaitiene, Asta Dabuliene, Alexander Panchenko, Boris F. Minaev, Dmytro Volyniuk, Juozas Vidas Grazulevicius
Summary: The competition between room-temperature phosphorescence (RTP) and thermally activated delayed fluorescence (TADF) was studied for four newly synthesised organic isomeric compounds. The different emission origins and efficiencies were found to be related to the energy gaps between singlet and triplet states and charge transfer processes.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Chemistry, Applied
Ying Zeng, Xiangxiang Zhai, Guangming Wang, Yuming Su, Minjian Wu, Biaobing Wang, Kaka Zhang
Summary: Organic afterglow materials, featuring small rate constants of key photophysical processes, such as phosphorescence decay and nonradiative decay of triplet excited states, have become an important class of luminescent materials. The transformation of afterglow mechanism from room-temperature phosphorescence to thermally-activated delayed fluorescence in intramolecular charge transfer systems has been reported. This transformation is achieved by increasing the acceptor strength of the ICT molecules, reducing singlet-triplet splitting energy, and enabling reverse intersystem crossing pathway to harvest triplet energies. These findings provide deep understanding of the behaviors of organic triplets with small photophysical rate constants. In addition, these organic ICT molecules have shown promising applications when incorporated into aqueous emulsion systems.
Article
Chemistry, Multidisciplinary
Philipp Sikora, Robert Naumann, Christoph Foerster, Katja Heinze
Summary: Despite the great progress achieved on phosphorescent or photoactive complexes of Earth-abundant transition metals, examples for phosphorescent heavy main group element complexes are rare, especially for group 14 complexes in the oxidation state +II. This study on tin(II) and lead(II) complexes provides unprecedented insight in the excited state energy landscape of tetrel(II) complexes and offers rational design principles for tetrel(II) complexes with long-lived phosphorescence.
Article
Chemistry, Multidisciplinary
Shuya Liu, Yuhang Lin, Dongpeng Yan
Summary: Long afterglow organic-inorganic hybrid materials have received significant attention in various fields such as information security and biological imaging. This study focuses on combining down-conversion and up-conversion pathways to achieve smart materials with excitation-dependent tunable room-temperature phosphorescence properties. A metal-organic framework (Zn-DCPS-BIMB) is designed to stabilize triplet excitons, coordinate the emission of different ligands, and introduce tunable emission color and up-conversion properties via heavy atoms effects promoting single-triplet orbital coupling and intersystem crossing.
CHINESE CHEMICAL LETTERS
(2023)
Review
Materials Science, Multidisciplinary
Zhenhong Qi, Bo Zhou, Dongpeng Yan
Summary: This review systematically summarizes the recent development of molecule-based micro/nanocrystal heterojunctions (MMHs), including basic concepts, materials classification, preparation methods, and representative photonic applications. The review highlights the current challenges and future trends in this field, providing new ideas and guidance for expanding the understanding and promoting the evolution of MMHs for advanced optical applications.
ADVANCED OPTICAL MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Xiaoyu Fang, Yanqun Tang, Yu-Juan Ma, Guowei Xiao, Pengyan Li, Dongpeng Yan
Summary: This work utilizes ultralong-lived triplet excitons to promote the separation of electron-hole pairs and achieve efficient transformation from excitons to carriers. By dispersing room temperature phosphorescent carbon dots onto g-C3N4, the photocatalytic and electrochemical activities are significantly enhanced. Experimental and theoretical calculations demonstrate that the ultralong-lived triplet excitons serve as an energy sustained-release mechanism, effectively improving the photocatalytic performance.
SCIENCE CHINA-MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Yu-Juan Ma, Guowei Xiao, Xiaoyu Fang, Tianhong Chen, Dongpeng Yan
Summary: This study reports an approach to leverage crystalline and amorphous states of a zero-dimensional metal-organic complex for the first time. The complex exhibits negative and positive photochromism due to the competitive chemical routes between photocycloaddition and photogenerated radicals. Different polymorphs lead to the on/off toggling of photo-burst movement, indicating controllable light-mechanical conversion. Three demos were constructed to support their application in information encryption and anti-counterfeiting. This work provides a proof-of-concept for a state- and polymorph-dependent photochemical route, paving an effective way for the design of new dynamically responsive systems.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Materials Science, Multidisciplinary
Ying Mu, Fang-Yuan Cao, Xiao-Yu Fang, Zhong-Xin Liu, Jun-Qing Wang, Song-De Han, Jie Pan, Qi Wei, Jin-Hua Li, Guo-Ming Wang
Summary: This study reports two Zn(II)-based organic coordination polymers that exhibit continuously tunable phosphorescence in multiple colors at room temperature by adjusting the excitation energy. These polymers have potential applications in anti-counterfeiting, display technology, and biomarkers. The unique photoluminescence behavior is induced by the selective formation and decay of multiple triplet excited states in the coordination network based on different excitations. The stabilization of the triplet excitons is achieved through the heavy atom effect of Br- ions and the restriction of molecular motion by crystallization.
ADVANCED OPTICAL MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Tianhong Chen, Yu-Juan Ma, Dongpeng Yan
Summary: By combining abundant multi-central luminescence and time-resolved, excitation-dependent ultralong phosphorescence with anti-counterfeiting design strategies, the development of multi-level and high-security systems for information encryption is achieved, providing extra color and time dimensions.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Review
Chemistry, Multidisciplinary
Bo Zhou, Dongpeng Yan
Summary: Excited-state tuning of luminescent metal-organic compounds has advanced applications in various fields. However, the luminescence lifetimes of these compounds are still limited due to the competition between luminous efficiency and lifetime. This review summarizes recent developments in realizing room-temperature phosphorescence and thermally activated delayed fluorescence, and discusses fundamental materials design, coordination assembly, and factors influencing luminescence properties.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Fei Nie, Dongpeng Yan
Summary: This study reports a facile bottom-up solution fabrication process to obtain metal-free supramolecular glasses (SMGs) at the macroscopic scale using L-Histidine and hexamethylenetetramine as building blocks. The chiral SMGs possess color-tunable ultralong room temperature phosphorescence (decay lifetime up to 141.2 ms) and circular polarized luminescence (g factor up to 8.7x10(-3)). The strong hydrogen bonds effectively drive the formation of SMGs, and provide a rigid microenvironment to boost triplet exciton generation. Applications including multicolored displays, visual UV detection, and persistently luminescent thermometer are demonstrated based on the excitation- and temperature-dependent ultralong phosphorescence of the SMGs.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Green & Sustainable Science & Technology
Muhammad Asim Mushtaq, Muhammad Arif, Ghulam Yasin, Mohammad Tabish, Anuj Kumar, Shumaila Ibraheem, Wen Ye, Saira Ajmal, Jie Zhao, Pengyan Li, Jianfang Liu, Ali Saad, Xiaoyu Fang, Xingke Cai, Shengfu Ji, Dongpeng Yan
Summary: Ammonia (NH3) is essential for fertilizer production and serves as a sustainable energy carrier and zero-carbon fuel. However, the current production process is unsustainable and energy-intensive. Electrochemical nitrogen reduction reactions (NRR) are promising alternatives, but still face challenges such as low Faraday efficiency and NH3 yields. This review summarizes the progress and strategies of various NRR electrocatalysts, and emphasizes the need for collaboration between theoretical and experimental studies, advanced characterization techniques, and understanding of the electrocatalytic mechanism for further development.
RENEWABLE & SUSTAINABLE ENERGY REVIEWS
(2023)
Article
Multidisciplinary Sciences
Fei Nie, Ke-Zhi Wang, Dongpeng Yan
Summary: In this study, the authors report supramolecular glasses based on self-assembled chiral metal-organic complexes with color-tunable circularly polarized afterglow. These materials can achieve multicolored circularly polarized emissions and have potential applications in optical displays and information storage. The research provides a method for the macroscopic self-assembly of chiral metal-organic hybrids and offers supramolecular glasses with wide-tunable afterglow and large circular polarization.
NATURE COMMUNICATIONS
(2023)
Article
Chemistry, Multidisciplinary
Bo Zhou, Zhenhong Qi, Meiqi Dai, Chang Xing, Dongpeng Yan
Summary: Efficient deep-blue thermally activated delayed fluorescence (TADF) and low-energy orange room temperature phosphorescence (RTP) are achieved by fabricating lead-free hybrid halides. The resulting 1D and 2D micro/nanostructures possess outstanding polarized luminescence and function as low-dimensional optical waveguides with remarkably low optical-loss coefficients. These materials show promising potential for applications in white LEDs and low-dimensional photonic systems.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Chemistry, Physical
Jingyi Lai, Bo Zhou, Ke-Zhi Wang, Dongpeng Yan
Summary: In this work, a series of layered double hydroxide (LDHs) nanosheets with red long-afterglow were fabricated by utilizing highly efficient triplet-triplet energy transfer. The Zn-based LDHs@RhB composite exhibited an energy transfer efficiency as high as 95.18% and could even generate red long-afterglow under white-light irradiation. Therefore, the LDHs@RhB composites show great potential in the fields of anticounterfeiting and information encryption.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2023)
Article
Chemistry, Multidisciplinary
Yumin Liu, Junbo Gong, Dongpeng Yan, Jingkang Wang
Summary: This study investigates the polymorphism and intermolecular interactions of a weakly polar molecule, dibenzoylmethane. A geometric method based on interatomic distance is developed to visualize and quantify favorable connections between non-hydrogen atoms, providing insights into the strength of intermolecular interactions in polymorphs of this molecule. The results show that the number of favorable connections correlates with the interaction energies, validating the feasibility of this geometric approach in weakly polar systems.
