Article
Materials Science, Multidisciplinary
Tiantian Wang, Man Liu, Wenhui Feng, Rui Cao, Yajing Sun, Lichang Wang, Dongzhi Liu, Yong Wang, Tianyang Wang, Wenping Hu
Summary: Research on strategies for organic long-persistent luminescence (LPL) emission with circularly polarized luminescence (CPL) characteristics is rare due to the lack of a clear light-emitting mechanism. This study demonstrates circularly polarized long-persistent luminescence (CPLPL) induced by exploiting the long-lived charge separation of a host-guest doping system, enhanced by a rigid polymer network. The combination of CPL and LPL properties in these materials has potential for information encryption and anticounterfeiting applications, and may inspire further research and development in the field of CPLPL materials.
ADVANCED OPTICAL MATERIALS
(2023)
Article
Chemistry, Applied
Jiawei Song, Desissa Yadeta Muleta, Wenhui Feng, Yakun Song, Xueqin Zhou, Wei Li, Lichang Wang, Dongzhi Liu, Tianyang Wang, Wenping Hu
Summary: This study demonstrates that the generation of charge-separated states and their efficiency are the two key factors influencing LPL properties, providing a new understanding for the design of organic LPL materials.
Article
Chemistry, Multidisciplinary
Shinichi Tan, Kazuya Jinnai, Ryota Kabe, Chihaya Adachi
Summary: This study confirms the presence of long-persistent luminescence (LPL) under electrical excitation, a characteristic that has previously only been observed in organic long-persistent luminescent systems (OLPLs) and not in organic light-emitting diodes (OLEDs).
ADVANCED MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
Desissa Yadeta Muleta, Jiawei Song, Wenhui Feng, Ruitao Wu, Xueqin Zhou, Wei Li, Lichang Wang, Dongzhi Liu, Tianyang Wang, Wenping Hu
Summary: Organic long-persistent luminescent materials can be easily quenched in aqueous solutions or air, but novel doped organic crystals have been developed to overcome this issue, allowing for stable LPL performance visible for over 8 s.
JOURNAL OF MATERIALS CHEMISTRY C
(2021)
Article
Materials Science, Multidisciplinary
Gaozhan Xie, Mingjian Zeng, Xin Zhang, Ansheng Luo, Jingru Zhang, Fei He, Xin Wang, Yang Hu, Weiguang Wang, Yannan Xie, Huanhuan Li, Runfeng Chen, Ye Tao
Summary: In this study, a stable organic radical anions were developed to achieve an efficient exciplex-based organic long persistent luminescence (OLPL) system with ultralong duration. The resulting system exhibits state-of-the-art ultralong green OLPL, and can be used in an intelligent afterglow lighting device.
SCIENCE CHINA-MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Xiao Liang, You-Xuan Zheng, Jing-Lin Zuo
Summary: In this work, organic long persistent luminescence (OLPL) materials with a duration of 20 to 40 minutes are achieved in a simple binary system based on a two-photon ionization mechanism. This system can simultaneously harvest excitons from both singlet and triplet excited states, making it a promising candidate for stable white OLPL. Through modulation and optimization of dopant molecules, the emission profiles of afterglow can be readily tuned to different shades of white with excellent color consistency.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2021)
Article
Chemistry, Physical
Zhen Chen, Daoyuan Zheng, Ruiling Zhang, Haiwen Wei, Xin Mao, Feng Liu, Keli Han
Summary: In this study, a novel electron donor-acceptor binary system was designed and investigated for its outstanding organic long-persistent luminescence (OLPL) performance. The binary system exhibited effective OLPL emission that lasted for more than 100 s after 1 min of ultraviolet light irradiation at room temperature. It also showed temperature-sensitive thermally activated delayed fluorescence emission and the formation of a charge-separated state.
Article
Optics
Kai Jiang, Yuci Wang, Cunjian Lin, Licheng Zheng, Jiaren Du, Yixi Zhuang, Rongjun Xie, Zhongjun Li, Hengwei Lin
Summary: The first organic long persistent luminescence (OLPL) system based on carbon dots (CDs) with a duration of over 1 hour has been developed. The CDs-based system, named m-CDs@CA, can be easily fabricated using a household microwave oven and exhibits long persistent luminescence under ambient conditions and even in aqueous media. The successful composition of CDs and CA, the formation of exciplexes and long-lived charged-separated states were confirmed by various characterizations. Covalent bond formation between CA and CDs was found to play a key role in activating long persistent luminescence and preventing its quenching from oxygen and water. This work provides new insights for the development of rare-earth-free and robust OLPL materials.
LIGHT-SCIENCE & APPLICATIONS
(2022)
Article
Chemistry, Multidisciplinary
Yimeng Liang, Man Liu, Tiantian Wang, Jiayi Mao, Lichang Wang, Dongzhi Liu, Tianyang Wang, Wenping Hu
Summary: UV curing can enhance the performance of amorphous organic long-persistent luminescence (LPL) materials by promoting the interaction between host and guest, leading to broader application prospects in fields such as anti-counterfeiting, nondestructive detection, and pattern marking.
ADVANCED MATERIALS
(2023)
Article
Chemistry, Applied
Tiantian Wang, Yakun Song, Man Liu, Chunyuan Gao, Hui Yang, Lichang Wang, Dongzhi Liu, Tianyang Wang, Wenping Hu
Summary: In this study, organic doped-crystals with different long-persistent luminescence (LPL) durations were successfully obtained through a host-guest doping system and water-based preparation. The high-quality polymer fibers containing these crystals were fabricated into a flexible thin-film by electrospinning, showing outstanding LPL performance.
Review
Chemistry, Applied
Xiangming Wang, Mengjiao Dong, Zijuan Li, Zepeng Wang, Fu-Shun Liang
Summary: Recently, the research on organic room-temperature phosphorescent materials (ORTP) and organic long persistent luminescence (OLPL) has gained significant attention in the fields of chemistry and material science. Although there have been many reports on high-efficiency ORTP and OLPL achieved through organic small molecule doping systems, the lack of clear molecular design principles and understanding of complex doping mechanisms hinders further development and practical applications. This mini-review summarizes the recent progress in ORTP and OLPL achieved through the doping system of organic small molecules, emphasizing the relationship between molecular structure and luminescent performance, and presents the current challenges and prospects for future development in this field.
Article
Chemistry, Multidisciplinary
Ryota Matsuoka, Shojiro Kimura, Tomoaki Miura, Tadaaki Ikoma, Tetsuro Kusamoto
Summary: Luminescent radicals are a new class of materials with unique photofunctions due to their open-shell electronic structure. Of particular interest are photofunctions where the radical's spin and luminescence are correlated, such as magnetoluminescence (ML), which can be useful in spin photonics. This study demonstrates that a covalently linked luminescent radical dimer can exhibit ML as a single-molecular property, providing insights into the requirements and mechanisms of ML in radicals and aiding the design of ML-active radicals through synthetic chemistry.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Article
Chemistry, Multidisciplinary
Deliang Wang, Junyi Gong, Yu Xiong, Hongzhuo Wu, Zheng Zhao, Dong Wang, Ben Zhong Tang
Summary: By doping organic materials with color-tunable and time-dependent long persistent luminescence, the encryption level can be improved, leading to promising applications in anti-counterfeiting.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Xiao Liang, Xu-Feng Luo, Zhi-Ping Yan, You-Xuan Zheng, Jing-Lin Zuo
Summary: A novel OLPL system was proposed using a melt-casting method with 0.1 mol% of Cu-I complexes doped into a TPP host, achieving an afterglow duration of over 3 hours. The OLPL lifetime can be modulated by different halogen atoms, marking a rare example of OLPL initiated through host-guest coordination with potential for expanding design strategies in this field.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2021)
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
Masashi Mamada, Hiroshi Katagiri, Chin-Yiu Chan, Yi-Ting Lee, Kenichi Goushi, Hajime Nakanotani, Takuji Hatakeyama, Chihaya Adachi
Summary: There is a growing interest in thermally activated delayed fluorescence (TADF) in materials, and this study provides insights into the properties of compounds and guidelines for high-performance TADF. It also offers implications for device engineering and molecular designs.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Rossa Mac Ciarnain, Hin Wai Mo, Kaori Nagayoshi, Hiroshi Fujimoto, Kentaro Harada, Robert Gehlhaar, Tung Huei Ke, Paul Heremans, Chihaya Adachi
Summary: Device optimization for LEDs focuses on maximizing the conversion of electrically injected charges into emitted light. The emission zone, believed to be crucial for device efficiency and lifetime, is difficult to measure due to its size below the optical diffraction limit. However, a method based on a single emission spectrum has been shown to enable precise measurements with sub-second time resolution, allowing for better understanding and control of the emission zone.
ADVANCED MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Yang-Kun Qu, Dong-Ying Zhou, Fan-Cheng Kong, Qi Zheng, Xun Tang, Yuan-Hao Zhu, Chen-Chao Huang, Zi-Qi Feng, Jian Fan, Chihaya Adachi, Liang-Sheng Liao, Zuo-Quan Jiang
Summary: In this study, we propose a method for constructing highly efficient MR-TADF emitters by introducing spiro-9,9'-bifluorene (SBF) units and adopting a mono-substituted design strategy. The results demonstrate that the SF1BN molecule exhibits high device efficiency and narrow-band emission, which is of significant importance for improving the performance of MR-TADF devices.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2022)
Article
Chemistry, Multidisciplinary
Takahiko Yamanaka, Hajime Nakanotani, Katsuhiro Nakamoto, Chihaya Adachi
Summary: Understanding the intrinsic carrier lifetime in disordered organic solid-state semiconductors is crucial for enhancing the performance of optoelectronic devices and photocatalysts. This study reveals an ultralong intrinsic carrier lifetime of more than one month in a disordered film of an organic semiconductor stored at room temperature without external power. The extraordinary lifetime is achieved through carrier stabilization by spontaneous orientation polarization, excited spin-triplet recycling, and blocking of recombination processes in disordered films.
ADVANCED MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Tony C. Wu, Andres Aguilar-Granda, Kazuhiro Hotta, Sahar Alasvand Yazdani, Robert Pollice, Jenya Vestfrid, Han Hao, Cyrille Lavigne, Martin Seifrid, Nicholas Angello, Fatima Bencheikh, Jason E. Hein, Martin Burke, Chihaya Adachi, Alan Aspuru-Guzik
Summary: Conventional materials discovery is time-consuming, but an automated platform has the potential to accelerate materials discovery, such as for organic lasers.
ADVANCED MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Chun Li, Henrik Schopmans, Lukas Langer, Stefan Marschner, Abhinav Chandresh, Jochen Buerck, Youichi Tsuchiya, Adachi Chihaya, Wolfgang Wenzel, Stefan Braese, Mariana Kozlowska, Lars Heinke
Summary: Researchers have successfully prepared a crystalline film based on porphyrin with chiral properties and demonstrated excellent optoelectronic performance. By assembling in a metal-organic framework film, the porphyrin core becomes twisted and chiral. The close packing and crystalline order of the porphyrin cores in the film result in outstanding optoelectronic properties. Through exciting the Soret band of porphyrin, efficient photoconduction with a high On-Off ratio is achieved. Moreover, handedness-dependent circularly-polarized-light photoconduction is obtained. The combination of assembly-induced chirality with the rich porphyrin chemistry opens up possibilities for organic materials with exceptional chiral and optoelectronic properties.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Optics
Xiao-Chun Fan, Kai Wang, Yi-Zhong Shi, Ying-Chun Cheng, Yi-Ting Lee, Jia Yu, Xian-Kai Chen, Chihaya Adachi, Xiao-Hong Zhang
Summary: Researchers have developed a new ultrapure green emitter called DBTN-2, which greatly improves the efficiency and color purity of OLED technology. The unique molecular design of this material reduces relaxation energy between excited and ground states and enhances spin-orbit couplings, resulting in highly efficient operation. These advancements make DBTN-2 a promising candidate for commercial green OLED displays.
Article
Chemistry, Physical
Rui Xu, Dingshuo Zhang, Junjie Si, Yihang Du, Qianqing Hu, Xiaoming Hao, Hong Zhao, Peiqing Cai, Qi Ai, Xin Yao, Yun Gao, Meiyi Zhu, Zenan Zhang, Muzhi Cai, Hin Wai Mo, Kentaro Harada, Zhizhen Ye, Xingliang Dai, Chihaya Adachi, Zugang Liu
Summary: This study reveals that the in situ formed copper iodide complex during the deposition of the electron transporting layer dominates the electroluminescence in cesium copper iodide LEDs. The use of a modified hole injection layer can suppress interfacial exciton quenching, resulting in low-voltage driving and high efficiency.
ACS ENERGY LETTERS
(2022)
Article
Chemistry, Multidisciplinary
Masashi Mamada, Satoshi Maedera, Susumu Oda, Thanh Ba Nguyen, Hajime Nakanotani, Takuji Hatakeyama, Chihaya Adachi
Summary: In this study, distributed feedback (DFB) laser devices were fabricated to investigate the light amplification properties of thermally activated delayed fluorescence (TADF) materials. It was found that DABNA derivatives with multiple-resonance effect achieved a very low lasing threshold. Moreover, advanced light amplification architectures composed of dual DABNA derivatives showed remarkably low lasing thresholds at high concentrations.
MATERIALS CHEMISTRY FRONTIERS
(2023)
Article
Chemistry, Physical
Ganbaatar Tumen-Ulzii, Morgan Auffray, Dino Klotz, George F. Harrington, Xian-Kai Chen, Umamahesh Balijapalli, Veeramani Vediyappan, Nozomi Nakamura, Zhao Feng, Kotaro Takekuma, Yuki Fujita, Pangpang Wang, Sunao Yamada, Kaoru Tamada, Munkhbayar Batmunkh, Yu Lin Zhong, Fabrice Mathevet, Hayden Salway, Miguel Anaya, Samuel D. Stranks, Toshinori Matsushima, Chihaya Adachi
Summary: The defects in perovskite solar cells have a significant impact on power conversion efficiencies and long-term stability. This study developed a novel material called pyridine-carbazole to passivate these defects and achieved high efficiency and long-term stable solar cells.
ACS APPLIED ENERGY MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Jingyun Tan, Xiushang Xu, Jun Liu, Serhii Vasylevskyi, Zesen Lin, Ryota Kabe, Yingping Zou, Klaus Muellen, Akimitsu Narita, Yunbin Hu
Summary: An unprecedented p-extended double [9]helicene has been reported, with its structure unequivocally revealed by single-crystal X-ray diffraction. This helicene exhibits remarkable near-infrared emission from 750 to 1100 nm, along with a high photoluminescence quantum yield of 18%. Optically pure D9H also displays panchromatic circular dichroism with a notable dissymmetry factor (g(CD)) of 0.019 at 590 nm, which is one of the highest reported for helicenes in the visible region.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Chemistry, Multidisciplinary
Xiushang Xu, Gianluca Serra, Andrea Villa, Rafael Munoz-Marmol, Serhii Vasylevskyi, Marcos Gadea, Andrea Lucotti, Zensen Lin, Pedro G. Boj, Ryota Kabe, Matteo Tommasini, Maria A. Diaz-Garcia, Francesco Scotognella, Giuseppe Maria Paterno, Akimitsu Narita
Summary: We reported the synthesis of a novel nanographene derivative with armchair, zigzag, and fjord edges, which exhibited intriguing optical properties and promising applications in photonics.
Article
Chemistry, Multidisciplinary
Samir Manna, Shunta Kakumachi, Kanak Kanti Das, Youichi Tsuchiya, Chihaya Adachi, Santanu Panda
Summary: The solvent plays a crucial role in the photophysical properties of donor-acceptor based photocatalysts. The access to E vs. Z-allylic amines, depending on the solvent, was achieved through decarboxylative vinylation of amino acids with vinyl sulfones. Detailed experimental studies were conducted to understand the role of the solvent in the reactivity and stereoselectivity of the vinylation reactions.
Article
Chemistry, Multidisciplinary
Chin-Yiu Chan, Subeesh Madayanad Suresh, Yi-Ting Lee, Youichi Tsuchiya, Tomas Matulaitis, David Hall, Alexandra M. Z. Slawin, Stuart Warriner, David Beljonne, Yoann Olivier, Chihaya Adachi, Eli Zysman-Colman
Summary: Two new deep-blue narrowband multi-resonant emitters, 1B-DTACrs and 2B-DTACrs, based on boron, nitrogen, and oxygen doped nanographenes are reported, with one of them showing thermally activated delayed fluorescence (TADF). Devices based on 2B-DTACrs demonstrated a high EQE(max) of 14.8% and CIE coordinates of (0.150, 0.044), which closely meet the BT.2020 requirement for blue pixels.
CHEMICAL COMMUNICATIONS
(2022)
Article
Chemistry, Multidisciplinary
Chin-Yiu Chan, Yi-Ting Lee, Masashi Mamada, Kenichi Goushi, Youichi Tsuchiya, Hajime Nakanotani, Chihaya Adachi
Summary: This work presents a new acceptor for the construction of blue thermally activated delayed fluorescence (TADF) emitters. The emitters based on this acceptor exhibit deep-blue emissions with high photoluminescence quantum yields. Importantly, they also demonstrate narrowed charge-transfer (CT) emissions, which is a desirable characteristic for TADF emitters. Devices using these emitters achieve high maximum external quantum efficiencies.
