Article
Polymer Science
Zhennan Zhao, Haisong Zhao, Junteng Liu, Zhongjie Ren
Summary: In this study, ladder-like polysiloxanes with high triplet energy were synthesized by introducing double-chain Si-O-Si polymer as the backbone and carbazole and triphenylphosphine oxide as side groups. The ladder-like structures were achieved through controlled polymerization method. The introduction of siloxane improved thermal stability and increased triplet energy level. The measurements showed that the bipolar polymer exhibited high HOMO value and facilitated hole and electron injection.
MACROMOLECULAR RAPID COMMUNICATIONS
(2023)
Article
Chemistry, Multidisciplinary
Rajendra Kumar Konidena, Junseop Lim, Jun Yeob Lee
Summary: A new molecular design based on carbazole was developed for the development of high triplet energy bipolar host materials for blue PhOLEDs. Two new isomeric host materials were synthesized, showing high triplet energy without compromising bipolar charge transporting property. The compounds demonstrated good performance in blue PhOLEDs applications, with higher EQE, current efficiency, and efficiency roll off compared to their analogues.
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
(2022)
Article
Chemistry, Multidisciplinary
Na Luo, Junhong Li, Tao Sun, Suran Wan, Peijia Li, Nan Wu, Ya Yan, Xiaoping Bao
Summary: Two carbazole sulfonamide-based macrocycles were synthesized and evaluated for their anion recognition properties, with macrocycle 1 showing stronger and more selective binding towards fluoride ion compared to its competitors. Macrocycle 2 exhibited significant changes in anion affinity and selectivity despite only slight differences in molecular structures.
Article
Materials Science, Multidisciplinary
Federico J. Hernandez, Rachel Crespo-Otero
Summary: The study explores the light-induced processes of Cz using computational approaches, highlighting the impact of isomeric impurities on its ultralong phosphorescence properties. The mechanisms for exciton, Dexter energy transfer, and electron transport were analyzed, shedding light on the factors enhancing excited state lifetimes and the role of doping with organic molecules in organic materials.
JOURNAL OF MATERIALS CHEMISTRY C
(2021)
Article
Biochemistry & Molecular Biology
Dovydas Blazevicius, Daiva Tavgeniene, Simona Sutkuviene, Ernestas Zaleckas, Ming-Ruei Jiang, Sujith Sudheendran Swayamprabha, Rohit Ashok Kumar Yadav, Jwo-Huei Jou, Saulius Grigalevicius
Summary: Novel host derivatives containing low molar mass compounds with pyridinyl-carbazole fragments showed promising characteristics in electro-phosphorescent organic light-emitting devices, demonstrating high stability, high glass transition temperatures, and efficient power and current efficiencies in blue and green PhOLEDs.
Article
Engineering, Environmental
Viktorija Andruleviciene, Karolis Leitonas, Dmytro Volyniuk, Gjergji Sini, Juozas Vidas Grazulevicius, Vytautas Getautis
Summary: Carbazole or acridan-substituted dibenzo[a,c]phenazines (CzDbp and AcDbp) were synthesized and investigated, showing different fluorescence behaviors with CzDbp exhibiting better luminescence efficiency and lower decay efficiency. Moreover, higher external quantum efficiencies of doped yellow and orange devices were achieved using TADF/TTA emitters CzDbp and AcDbp.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Chemistry, Multidisciplinary
En-Kai Xiao, Xian-Tao Wu, Feng Ma, Le-Wei Miao, Yi-Jun Jiang, Peng Chen
Summary: This study demonstrates the first direct and selective 3,6-di-alkylation of carbazoles through iron-catalyzed hydroarylation of styrenes. The method is simple, general, and efficient, delivering a wide range of di-benzyl-carbazoles in up to 96% yield at room temperature without the need for a noble-metal catalyst, directing group, or additives.
CHEMICAL COMMUNICATIONS
(2021)
Article
Materials Science, Multidisciplinary
Tae Hoon Ha, Jong-Kwan Bin, Chil Won Lee
Summary: In this study, two host materials were designed and synthesized for improving the lifetime of blue TADF OLEDs. These materials, which incorporate pyridine core carbazole connected at different linking positions, exhibit good thermal stability, high BDE, and longer lifetime than the reference host. The best device performances were achieved by a blue TADF OLEDs system consisting of a specific host and dopant, with a maximum EQE of 16.2% and an improvement of 88% in operational lifetime.
ORGANIC ELECTRONICS
(2022)
Article
Chemistry, Organic
Gemma M. Rodriguez-Muniz, Miguel Gomez-Mendoza, Paula Miro, Pilar Garcia-Orduna, German Sastre, Miguel A. Miranda, M. Luisa Marin
Summary: This study provides fundamental insight into the role of topology and excited state multiplicity in governing the balance between photosensitized thymine-thymine formation and repair.
JOURNAL OF ORGANIC CHEMISTRY
(2022)
Article
Chemistry, Multidisciplinary
Cui Wang, Florian Reichenauer, Winald R. Kitzmann, Christoph Kerzig, Katja Heinze, Ute Resch-Genger
Summary: This study achieved efficient green-to-blue upconversion by using the earth-abundant chromium complex [Cr(bpmp)(2)](3+), with a quantum yield close to the theoretical maximum, showing potential for practical applications.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2022)
Article
Optics
Zhaoyue Lue, Ying Liu, Yichao Jin, Lijiang Zhang, Xiao Wang, Chichong Lu, Guofan Jin
Summary: A symmetrical carbazole-benzonitrile derivative, CzPhFBN, was designed as a host for phosphorescent organic light-emitting diodes (PhOLEDs) based on a para-linkage concept. The CzPhFBN molecule consisted of a cyano (CN) unit and a carbazole (Cz) unit attached to the central phenyl ring at the para positions. The results showed that CzPhFBN had a high triplet energy of over 3.0 eV and exhibited bipolar carrier transporting property.
JOURNAL OF LUMINESCENCE
(2023)
Article
Chemistry, Organic
Shao-Cong Zhan, Ren-Jie Fang, Jing Sun, Chao-Guo Yan
Summary: Functionalized spiro[carbazole-3,5 '-pyrimidines] and spiro[carbazole-3,1 '-cyclohexanes] were efficiently synthesized in satisfactory yields with high diastereoselectivity using CuSO4-catalyzed multicomponent reactions. The initial compounds were further converted to new compounds using different oxidation methods.
ORGANIC & BIOMOLECULAR CHEMISTRY
(2021)
Article
Chemistry, Physical
Tongyu Zhao, Wenjun Ni, Christian Kloc, Licheng Sun, Gagik G. Gurzadyan
Summary: The study found that singlet fission (SF) can be directly observed in ICZ films, while SF and polaron formation compete in the ultrafast timescale in ICZ crystals.
JOURNAL OF PHYSICAL CHEMISTRY C
(2021)
Article
Chemistry, Physical
Yoshifumi Noguchi
Summary: The all-electron first-principles GW+Bethe-Salpeter method was used to study carbazole benzonitrile (CzBN) derivatives, revealing the optical properties of TADF molecules and proposing new exciton map for classification. Two possible TADF mechanisms were suggested based on the exciton binding energy and electron-hole delocalization ratio.
JOURNAL OF CHEMICAL PHYSICS
(2021)
Article
Chemistry, Multidisciplinary
Nan Gong, Runchen Lai, Shiyu Xing, Zhengzheng Liu, Junyao Mo, Tao Man, Zicheng Li, Dawei Di, Juan Du, Dezhi Tan, Xiaofeng Liu, Jianrong Qiu, Beibei Xu
Summary: This study proposes a novel strategy to enhance triplet-triplet annihilation upconversion (TTA-UC) by incorporating ionic-bonded CsPbBr3 and lanthanide Ce3+ ions into composite nanocrystals. This electronic state engineering increases the population of triplet excitons participating in energy transfer, enhances coupling strength and driving force, and ultimately leads to a nonlinear enhancement of UC efficiency. The findings clarify the functions of electronic state engineering in inorganic sensitizers and TTA-UC.
Article
Chemistry, Physical
Boya Zhang, Lakshmi N. S. Murthy, Aditya Mishra, Melanie H. Bowler, Chin-Lung Chung, Jia Du, Mihaela C. Stefan, Ken-Tsung Wong, Jason D. Slinker, Julia W. P. Hsu
Summary: Dilute-donor (DD) organic photovoltaic (OPV) devices have a low concentration of donor molecules in an acceptor matrix, and they exhibit a higher open-circuit voltage (Voc) compared to their bulk heterojunction (BHJ) counterparts. The Voc variation among different donors in the same acceptor matrix cannot be adequately explained by Schottky barrier heights or interfacial area. The Voc of DD OPVs is predominantly determined by non-radiative voltage loss, similar to BHJ OPVs.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
Article
Chemistry, Multidisciplinary
Yuan-Cheng Hu, Li-Ming Chen, Zong-Liang Lin, Jhih-Wei Lee, Wei-Chih Wei, Tzu-Yu Ko, Chun-Yuan Lo, Wen-Yi Hung, Ken-Tsung Wong
Summary: In this study, a new triazatruxene-based donor was introduced to suppress aggregation. The effects of steric hindrance on exciplex formation were investigated. By selecting appropriate exciplex-forming blends as the emitting layer, efficient OLED devices were achieved.
JOURNAL OF THE CHINESE CHEMICAL SOCIETY
(2022)
Article
Chemistry, Multidisciplinary
Guan-Cheng Liu, Tzu-Hao Huang, Hao-Wen Wang, Chao-Hsien Hsu, Pi-Tai Chou, Wen-Yi Hung, Ken-Tsung Wong
Summary: Two new acceptors, p-QCN and m-QCN, were synthesized and blended with the donor CPTBF to form exciplex-forming blends. The energy levels of p-QCN and m-QCN were modulated by substituents 4- and 3-benzonitrile, respectively. The exciplex-forming blends showed red-shifted emissions and were characterized by time-resolved photoluminescence. The device efficiency was improved by using different blend ratios and a new fluorescent emitter, BPBBT, was introduced to further enhance the performance.
CHEMISTRY-A EUROPEAN JOURNAL
(2023)
Article
Materials Science, Multidisciplinary
Chun-Yen Lin, Chen-Han Lu, Kai-Hua Kuo, Miaosheng Wang, Yipeng Tang, Yixuan Dou, Bin Hu, Chung-Chih Wu, Ken-Tsung Wong
Summary: This work presents the design of new blue TADF emitters with a triphenylamine-based macrocyclic donor, which is found to enhance reverse intersystem crossing and triplet-upconversion efficiency. Experimental results show that incorporating the macrocyclic donor in the blue device significantly improves its performance, achieving a maximum external quantum efficiency of 32.2%. This study offers a new strategy for designing efficient blue organic light-emitting diodes.
ADVANCED OPTICAL MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Meng-Ju Tsai, Wei-Lun Huang, Li-Ming Chen, Guo-Lun Ruan, Dian Luo, Zong-Liang Tseng, Ken-Tsung Wong
Summary: A new dicarbazole-based donor, BCz3Ph, was synthesized and characterized for exciplex formation. The green-emitting layer (EML) of solution-processed OLED devices was formed by blending the new exciplex BCz3Ph:PO-T2T with a photoluminescence quantum yield (PLQY) of 43% and thermally activated delayed fluorescence (TADF) character. In order to improve hole injection into the EML, a new cross-linkable monomer, BCzC4Sy, was designed to form a solvent resistant hole-transporting layer (HTL) after thermal polymerization. The study demonstrates the potential of employing a thermally cross-linkable HTM and exciplex-based EML to produce high efficiency solution-processed OLEDs.
JOURNAL OF MATERIALS CHEMISTRY C
(2023)
Article
Chemistry, Physical
Chih-Ping Chen, Ken-Tsung Wong, Bing-Huang Jiang, Yu-Chi You, Di-Wen Lin
Summary: Organic photovoltaics (OPVs) have the potential to achieve high performance with ternary structures by introducing unfused-ring small-molecule acceptors. A series of acceptor-donor-acceptor-configured small-molecule acceptors were synthesized in this study and blended with polymer materials to achieve good device performance.
ACS APPLIED ENERGY MATERIALS
(2022)
Article
Biochemistry & Molecular Biology
Yu-Yu Hsieh, Jing-Jong Shyue, Yu-Chiang Chao, Ken-Tsung Wong, Dario M. Bassani
Summary: The incorporation of biuret hydrogen-bonding sites onto chiral binaphthalene-based chromophores was investigated for the synthesis of sub-micron-sized, vesicle-like aggregates with chiroptical properties. Luminescent chromophores were synthesized via Suzuki-Miyaura coupling of the corresponding chiral 4,4'-dibromo-1,1'-bis(2-naphthol), and their emission spectrum could be tuned through conjugation extension. Scanning electron microscopy confirmed the spontaneous formation of hollow spheres with a diameter of ca. 200-800 nm, along with strong asymmetry in the circularly polarized absorption spectra. Circular polarization of the emission, with values of g(lum) = ca. 10(-3), could be further enhanced upon aggregation.
Article
Materials Science, Multidisciplinary
Miaosheng Wang, Dian Luo, Tzu-Hung Yeh, Yi-Hsuan Huang, Chang-Lun Ko, Wen-Yi Hung, Yipeng Tang, Shun-Wei Liu, Ken-Tsung Wong, Bin Hu
Summary: Designing in-plane-oriented light-emitting dipoles is crucial for developing efficient OLEDs. This study explores the anisotropy dynamics of light-emitting dipoles in time and energy domains. By suppressing host-guest Coulomb scattering, the anisotropy dynamics can be extended in both domains, leading to a high external quantum efficiency of 34.01% in the OLED system.
ADVANCED OPTICAL MATERIALS
(2023)
Article
Nanoscience & Nanotechnology
Kai-Hua Kuo, Yi-Jhen Chui, Yu-Che Hou, Po-Ting Lai, Cheng-Yueh Chen, Guang-Hsun Tan, Hao-Wu Lin, Ken-Tsung Wong
Summary: This study reports three organic conjugated small molecules and their application in memristor behaviors. By appropriate molecular design and doping strategy, the endurance and stability of the devices have been improved.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Nanoscience & Nanotechnology
Chen-Han Lu, Chun-Yen Lin, Shi-Xian Zeng, Yu-Pin Chou, Chia-Hsun Chen, Yi-Hung Liu, Jiun-Haw Lee, Chung-Chih Wu, Ken-Tsung Wong
Summary: This study presents an efficient molecular engineering approach to modifying the donor or acceptor features of TADF molecules for deep-blue emission. Two emitters, c-ON-MeTRZ and c-NS-MeTRZ, were synthesized and characterized by introducing oxygen and sulfone as a bridge unit onto the macrocyclic donor. The modified emitters showed blue-shifted emissions with high photoluminescence quantum yields (PLQYs) and retained TADF characteristics.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Applied
Bing-Huang Jiang, Yu-Ting Liao, Yu-Hsuan Tu, Ken-Tsung Wong, Chih-Ping Chen
Summary: In this study, the performance of donor molecules with an isoindigo-based core was compared to that of a thienoisoindigo-based counterpart in all-small-molecule-based optoelectronic devices. The isoindigo-based molecule showed deeper energy level, efficient light harvesting, and higher carrier mobility, leading to over eight times greater organic photovoltaic performance compared to the thienoisoindigo-based molecule. The optimized organic photodetector incorporating the isoindigo-based molecule exhibited excellent properties, suggesting great potential for isoindigo as a building block for OPDs.
Article
Chemistry, Multidisciplinary
Chun-Yen Lin, Chao-Hsien Hsu, Chieh-Ming Hung, Chi-Chi Wu, Yi-Hung Liu, Emily Hsue-Chi Shi, Tse-Hung Lin, Yuan-Cheng Hu, Wen-Yi Hung, Ken-Tsung Wong, Pi-Tai Chou
Summary: The inclusion complexation provides a new approach to understand the structure, formation thermodynamics, and properties of exciplexes. It enables the fabrication of efficient organic light-emitting diodes (OLEDs) with a high external quantum efficiency.
Article
Materials Science, Multidisciplinary
Bo-Yuan Chuang, Chun-Yao Ke, Yu-Jen Shao, Ken-Tsung Wong, Guey-Sheng Liou
Summary: Polyarylamine-based dielectric electrets and pentacene as p-type semiconductors were used to fabricate photoresponsive flash transistor memories. The PDTPmC electret, with high dipole moment, coplanar conformation, and highly conjugated structure, demonstrated outstanding hole-trapping capability and photorecoverability. The PDTPmC-based memory device exhibited excellent switching reliability and readout current ratio.
ACS APPLIED POLYMER MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Jie Yan, Yixin Wu, I-Che Peng, Yi Pan, Shek-Man Yiu, Ken-Tsung Wong, Wen-Yi Hung, Yun Chi, Kai-Chung Lau
Summary: In this study, three Ir(iii) based carbene complexes were synthesized and characterized. These complexes exhibited sky-blue emission and high photoluminescent quantum yields. One of the complexes showed high efficiency and external quantum efficiency in blue OLED devices.
JOURNAL OF MATERIALS CHEMISTRY C
(2023)
Article
Chemistry, Physical
Yi-Sheng Chen, Wei-Chih Wei, Hao Chen, Tsung-Lin Tsai, Yu-Cheng Kung, Wen-Yi Hung, Ken-Tsung Wong
Summary: This study examines exciplex formation and photoluminescence characteristics by blending hexaphenylbenzene-based donors and triazine-centered acceptors. The results show that effective exciplex formation and delayed fluorescence can be achieved through energy level alignment and the incorporation of fluorescent dopants. The combination of an exciplex cohost and a D-A-D-type fluorescence emitter is an effective strategy for developing high-efficiency OLED devices with all fluorescent materials.
MOLECULAR SYSTEMS DESIGN & ENGINEERING
(2022)
Article
Materials Science, Multidisciplinary
Katerina Skopalova, Itana Nusa Bubanja, Dragomir Stanisavljev, Nikola Cvjeticanin, Vera Kasparkova, Eliska Dad'ova, Erika Pavlikova, Marek Koutny, Marija Gizdavic-Nikolaidis, Petr Humpolicek
Summary: This study compares the biological properties of PANI prepared by different synthesis methods and oxidizing agents, which improves its potential applications in the biomedical field.
Article
Materials Science, Multidisciplinary
Hui-Ping Li, Cai-Yan Gao, Zhi-Ping Chen, Xin-Heng Fan, Lian-Ming Yang
Summary: In this study, a novel type of D-A non-fused-ring copolymers was designed and synthesized to overcome the trade-off relationship between electrical conductivity and Seebeck coefficient in organic semiconductors. The incorporation of fluorine atoms into the polymer backbone effectively increased the ordered degree of molecular stacking and improved both the electrical conductivity and Seebeck coefficient. The bimodal orientation of polymers played a crucial role in decoupling the correlation between electrical conductivity and Seebeck coefficient.
Article
Materials Science, Multidisciplinary
Mansour A. S. Salem, Amjad Mumtaz Khan, Hatem A. M. Saleh, Khalil M. A. Qasem, Mizna Ahmed, Aadil Shafi Bhat, Abdulaziz Abdullah Qasem Ali, Younes S. A. Ghanem, Ali Alrabie, Abdel-Basit Al-Odayni, Waseem Sharaf Saeed, Basheer Al-Anesi
Summary: This research focuses on the versatile substance, polyaniline/layered double hydroxide (PANI@Nd-Co/LDH), under solvothermal conditions. A thorough analysis of its structure and morphology was conducted using various analytical methods. The findings showed that PANI@Nd-Co/LDH exhibited highly sensitive and specific fluorescence detection of Pb(II) and Al(III), outperforming other heavy metal ions. The sensor demonstrated a turn-off fluorescence response for Pb(II) ions and a turn-on fluorescence response for Al(III) ions. The minimum detectable limits (MDL) were determined to be 9.6 nM for Pb(II) and 220 nM for Al(III). PANI@Nd-Co/LDH could be easily regenerated and reused for multiple cycles. The detection mechanisms involved the inner filter effect (IFE) for Pb(II) and the chelation-enhanced fluorescence (CHEF) effect for Al(III). These results highlight the excellent potential of PANI@Nd-Co/LDH in the detection and recognition of Pb(II) and Al(III) ions.
