Article
Chemistry, Inorganic & Nuclear
Sriram Sundaresan, Jens-Georg Becker, Julian Eppelsheimer, Alexander E. Sedykh, Luca M. Carrella, Klaus Mueller-Buschbaum, Eva Rentschler
Summary: A new nitro-oxidative ligand was synthesized and complexes with iron and zinc were formed. The spin transition of the iron complex was analyzed by X-ray crystallography and magnetic susceptibility measurements. Solid-state luminescence studies provided preliminary evidence of the interplay of luminescence and spin transition in the iron complex.
DALTON TRANSACTIONS
(2023)
Article
Engineering, Environmental
Chengjun Wu, Jingsheng Miao, Lian Wang, Youming Zhang, Kai Li, Weiguo Zhu, Chuluo Yang
Summary: Two novel tetradentate cyclometalated palladium(II) complexes were synthesized and used as emissive dopants for red and NIR phosphorescent OLEDs. These complexes exhibited NIR photoluminescence and optimized OLED devices showed high external quantum efficiency.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Chemistry, Inorganic & Nuclear
Angelina Z. Petrovic, Dusan C. Cocic, Dirk Bockfeld, Marko Zivanovic, Nevena Milivojevic, Katarina Virijevic, Nenad Jankovic, Andreas Scheurer, Milan Vranes, Jovana V. Bogojeski
Summary: This paper presents the synthesis and structural characterization of three newly synthesized osmium(ii) complexes; investigates the kinetics of substitution reactions, binding properties, and interactions with biomolecules such as CT-DNA and HSA; further explores the binding mechanism through fluorescence competition experiments and molecular docking studies. In vitro cytotoxicity and redox status experiments on cancer cell lines provide insight into the potential molecular mechanisms of these complexes.
INORGANIC CHEMISTRY FRONTIERS
(2021)
Article
Chemistry, Inorganic & Nuclear
Kyounghoon Lee, Christine M. Thomas
Summary: The study reports an alternative method for preparing multidentate phosphine ligands with alkyl substituents by replacing phosphine substituents in nickel-bound PNNP ligands. The stereoselectivity of reactions can be controlled by varying the reaction temperature, and the method allows for metallation and subsequent demetallation of the ligand. Competitive elimination of both alkyl and phenyl substituents and/or attenuated reactivity may occur in some reactions.
INORGANIC CHEMISTRY
(2021)
Article
Chemistry, Inorganic & Nuclear
Lukas Masaryk, Darina Muthna, Petr Halas, Pavel Zoufaly, Eva Peterova, Radim Havelek, Bohuslav Drahos, David Milde, Alena Mrkvicova, Pavel Starha
Summary: In the presence of carboxypeptidase, the hydrolytically stable complex partially released the bioactive substituent indomethacin, which was bound through the amide bond to the chelating moiety. The stability in the presence of other relevant biomolecules and cancer cell viability were also investigated in this study.
DALTON TRANSACTIONS
(2022)
Article
Chemistry, Inorganic & Nuclear
Lu Zhu, Chenwei Sha, Anqi Lv, Wang Xie, Kang Shen, Yumeng Chen, Guohua Xie, Huili Ma, Hongbo Li, Xiao-Chun Hang
Summary: Two tetradentate Pt(II) complexes with bulky-group hindrances were synthesized and investigated for their structural and blue phosphorescent properties. The results showed high photoluminescent quantum yields and excellent electroluminescent performances. Understanding the role of peripheral hindrances provides an effective approach to designing high-quality blue phosphorescent emitters.
INORGANIC CHEMISTRY
(2022)
Article
Materials Science, Multidisciplinary
Ze-Lin Zhu, Wen-Cheng Chen, Shao-Fei Ni, Jie Yan, Sheng Fu Wang, Li-Wen Fu, Han-Yan Tsai, Yun Chi, Chun-Sing Lee
Summary: By introducing fluorene into the design, five blue-emitting bis-tridentate Ir(iii) phosphors were successfully synthesized with different emission characteristics. A deep blue OLED based on one of these phosphors exhibited excellent maximum external quantum efficiency, comparable to state-of-the-art deep blue phosphors.
JOURNAL OF MATERIALS CHEMISTRY C
(2021)
Article
Chemistry, Multidisciplinary
Chane Venter, Matthew P. Akerman
Summary: Three bis(pyridyl-imine) ligands were synthesized and complexed to form four novel complexes with silver(I) salts. Different pre-organized ligands led to the formation of monomeric, dimeric, and polymeric structures in the silver(I) chelates, showcasing the influence of ligand design on metal chelate structures. The d(10) electronic configuration of silver allowed for the adoption of tetrahedral and square planar coordination geometries in the compounds, with DFT methods used to study the stabilizing effects of intermolecular interactions.
Article
Chemistry, Inorganic & Nuclear
Yuanbin She, Kewei Xu, Xiaoli Fang, Yun-Fang Yang, Weiwei Lou, Ying Hu, Qisheng Zhang, Guijie Li
Summary: A series of novel tetradentate Pt(II) and Pd(II) complexes containing fused 6/6/6 or 6/6/5 metallocycles with ACzCz-based ligands were developed, showing different electrochemical and photophysical properties influenced by both ligand structures and central metal ions. Pt(II) complexes exhibit mixed metal-to-ligand charge transfer and ligand-centered characters, while Pd(II) complexes have decreased MLCT characters and enhanced LC compositions. Additionally, Pd(ACzCz-1) exhibits ultralong low-temperature phosphorescence, and Pt(ACzCz-2)-based green OLED shows promising performance.
INORGANIC CHEMISTRY
(2021)
Article
Chemistry, Inorganic & Nuclear
Jie Yan, Qin Xue, Hui Yang, Shek-Man Yiu, Ye-Xin Zhang, Guohua Xie, Yun Chi
Summary: Six novel homoleptic Ir(III) complexes with imidazo-[4,5-b]pyrazin-2-ylidene chelates have been successfully designed and synthesized. These complexes exhibit narrowband blue and broadened green emission in degassed toluene solution, with high photoluminescent quantum yields. The tert-butylphenyl cyclometalate is found to be more electron donating than the N-phenyl cyclometalate, resulting in a red-shifted emission. Furthermore, OLED and hyper-OLED devices utilizing these complexes as dopants or sensitizers have demonstrated high external quantum efficiencies and narrowband emissions.
INORGANIC CHEMISTRY
(2022)
Article
Chemistry, Inorganic & Nuclear
Zi Ning Liu, Chi Xian He, Hong Ju Yin, Shi Wen Yu, Jian Bin Xu, Jian Wei Dong, Yan Liu, Shu Biao Xia, Fei Xiang Cheng
Summary: Two novel homometallic Ru-Ru and heterometallic Ru-Os dimers and trimers were first prepared and characterized, exhibiting reversible oxidation and reduction properties, intense absorption spectra in UV and visible regions, weak emission spectra in NIR, and quantitative luminescence quenching through intramolecular energy transfer at room temperature.
EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
(2021)
Article
Chemistry, Inorganic & Nuclear
Piermaria Pinter, Johannes Soellner, Thomas Strassner
Summary: A Pd(II) complex with two strong donor ligands, a cyclometalated benzoquinoline and a N-heterocyclic carbene (NHC) ligand, exhibits phosphorescent emission at low temperatures. The prototype Pd(II) complex shows excellent emissive properties at 77K, with nearly quantitative quantum yield and an emission wavelength of 470 nm.
JOURNAL OF ORGANOMETALLIC CHEMISTRY
(2023)
Article
Chemistry, Inorganic & Nuclear
Bo-Kai Su, Yi-Hung Liu, Shie-Ming Peng, Shiuh-Tzung Liu
Summary: The study revealed the monodentate ligand ability of 5-phenyl-2,8-bis(2-pyridinyl)anthyridine (L) towards palladium ions, leading to the synthesis of various distinct complexes, with potential applications in Suzuki-Miyaura coupling reactions.
Article
Chemistry, Inorganic & Nuclear
Bo Wang, Justin Barnes, Skylar J. Ferrara, Stephen Sproules, Xiaodong Zhang, Joel T. Mague, James P. Donahue
Summary: Saturated linkages between heteroatoms support the formation of fully reduced [(Cu(L-N2S2))2Cu2] complexes, which are relevant for the composition of nitrous oxide reductase (N2OR). A newly devised route allows the synthesis of a mixed-valent pentacopper complex [(Cu(L-N2SAr2))3Cu2], which exhibits 3-fold rotational symmetry. The oxidation of this complex results in the formation of a decacopper species with greater mixed valency.
INORGANIC CHEMISTRY
(2023)
Article
Chemistry, Inorganic & Nuclear
Stephen Sproules
Summary: Spectroscopic and computational examination reveals a Class III mixed-valent ground state for the neutral tris-dioxolene complex [V(dbcat)(3)]. The radical is stabilized by delocalization across the ligands mediated by the V(v) center's energy matched d orbital manifold. This electronic structure differs from the tris-dithiolene and tris-diimine analogues with V(iv) and V(ii) ions, respectively.
DALTON TRANSACTIONS
(2022)
Article
Chemistry, Multidisciplinary
Zi-Qi Feng, Sheng-Yi Yang, Fan-Cheng Kong, Yang-Kun Qu, Xin-Yue Meng, You-Jun Yu, Dong-Ying Zhou, Zuo-Quan Jiang, Liang-Sheng Liao
Summary: This study reports two TSCT-TADF emitters and successfully enhances their luminescent properties by controlling the molecular configuration without directly modifying the donor or acceptor. The emitter with the fluorine moiety exhibits more evident electrostatic repulsive force onto the central structure, resulting in higher external quantum efficiency.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Review
Biochemistry & Molecular Biology
Shu-Guang Meng, Xiao-Zhao Zhu, Dong-Ying Zhou, Liang-Sheng Liao
Summary: Solution processes have potential advantages for manufacturing organic and quantum dot light-emitting diodes (OLEDs and QLEDs) with low cost and large-scale production. However, the combination of solution processes with tandem architecture is limited due to unresolved challenges, such as orthogonal solubility, surface wettability, interfacial corrosion, and charge injection. This review focuses on recent progress in solution-processed tandem OLEDs and tandem QLEDs, covering the design and fabrication of various intermediate connection layers (ICLs) through solution processes, and providing suggestions for future challenges in materials and devices to stimulate the development of emerging light technologies.
Review
Chemistry, Multidisciplinary
Yu-Chen Wei, Kai-Hua Kuo, Yun Chi, Pi-Tai Chou
Summary: Designing bright and efficient near-infrared (NIR) emitters has become a hot research topic in the fields of biological imaging, medical therapy, optical communication, and night-vision devices. Two complementary approaches, exciton delocalization and molecular deuteration, have been proposed to suppress nonradiative internal conversion rates and increase the efficiency of NIR emission. This concept has been experimentally verified using square-planar Pt(II) complexes. The results show high NIR emission efficiency and photoluminescent quantum yield.
ACCOUNTS OF CHEMICAL RESEARCH
(2023)
Article
Nanoscience & Nanotechnology
Jie Yan, Sheng Fu Wang, Chao-Hsien Hsu, Emily Hsue-Chi Shi, Chi-Chi Wu, Pi-Tai Chou, Shek-Man Yiu, Yun Chi, Caifa You, I-Che Peng, Wen-Yi Hung
Summary: In this study, we synthesized different blue emitting homoleptic iridium(III) phosphors with specific cyclometalates. These iridium complexes displayed intense phosphorescence in the solution state and were able to transfer energy to multiresonance thermally activated delayed fluorescence (MR-TADF) terminal emitters via Fo''rster resonance energy transfer (FRET). OLEDs using these phosphors achieved true blue, narrow bandwidth emission with high efficiency. The research also analyzed the kinetic parameters involved in energy transfer processes and proposed ways to improve efficiency roll-off.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Multidisciplinary
Yu-Chen Wei, Bo-Han Chen, Ren-Siang Ye, Hsing-Wei Huang, Jia-Xuan Su, Chao-Yang Lin, Justin Hodgkiss, Lian-Yan Hsu, Yun Chi, Kai Chen, Chih-Hsuan Lu, Shang-Da Yang, Pi-Tai Chou
Summary: Based on transient absorption spectroscopy and transient grating photoluminescence spectroscopy, this study reveals the collective out-of-plane motions of the aggregated Pt-II complex 4H in excited states, which facilitate the excited-state deactivation and enhance the near-infrared emission efficiency.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Biochemistry & Molecular Biology
Junghwa Lee, Pyoungsik Shin, Pi-Tai Chou, Taiha Joo
Summary: The excited state intramolecular proton transfer (ESIPT) dynamics of o-hydroxy analogs of the GFP chromophore were investigated using time-resolved spectroscopies and theoretical calculations. These compounds are an ideal system for studying the influence of electronic properties on the energetics and dynamics of ESIPT, as well as for applications in photonics. Through high-resolution time-resolved fluorescence and quantum chemical methods, the ultrafast ESIPT process was observed in 30 fs. While the ESIPT rates were not affected by the electronic properties of the substituents, the energetics, structures, dynamics following ESIPT, and possibly the product species were found to be distinct. The results suggest that fine tuning the electronic properties of these compounds can modify the molecular dynamics of ESIPT and subsequent structural relaxation to achieve brighter emitters with broad tuning capabilities.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2023)
Article
Nanoscience & Nanotechnology
Jin-Tin Lin, Chia-Sheng Huang, Cheng Ming Hui, Yu-Hong Liang, Luke The, Fang-Hsien Lu, Yun Chi, Sheng-Fu Wang, K. R. Justin Thomas, Jwo-Huei Jou
Summary: Nanoparticles can enhance the performance of optoelectronic devices, but their limited absorption bandwidth at around 520 nm restricts their effectiveness in the red region. However, this study demonstrates that a single nanoparticle based on nonprecious copper can significantly enhance the efficiency of LEDs of all colors, with an unprecedented wide absorption band.
ACS APPLIED NANO MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Jie Yan, Zi-Qi Feng, Yixin Wu, Dong-Ying Zhou, Shek-Man Yiu, Chin-Yiu Chan, Yi Pan, Kai Chung Lau, Liang-Sheng Liao, Yun Chi
Summary: Efficient blue phosphors for OLEDs remain challenging. Researchers have synthesized a series of Ir(III) complexes and studied their structures and photophysical properties to overcome this challenge. Some of the emitters can undergo interconversion without decomposition in a specific solvent. The synthesized Ir(III) complexes exhibit good luminescence properties and show potential for making blue OLEDs.
ADVANCED MATERIALS
(2023)
Article
Chemistry, Inorganic & Nuclear
Jie Yan, Min Song, Dong-Ying Zhou, Shek-Man Yiu, Liang-Sheng Liao, Yun Chi, Mo Xie
Summary: Homoleptic charge-neutral Ir(III) metal complexes with tridentate chelates composed of pyrazole-pyridine-pyrazolefragments were synthesized, and the substituents on the chelate played a significant role in tuning their photophysical and electrochemical properties. By introducing CF3 substituents at specific positions, the phosphorescence color of the complexes could be adjusted from green to orange with improved emission quantum yield. The newly synthesized Ir(III) complexes showed high thermal stability and were applied as dopant emitters in OLEDs, exhibiting high external quantum efficiency and current efficiency.
Article
Multidisciplinary Sciences
Jie Yan, Dong-Ying Zhou, Liang-Sheng Liao, Martin Kuhn, Xiuwen Zhou, Shek-Man Yiu, Yun Chi
Summary: In this study, four Ir(III) metal complexes were designed to achieve efficient blue emission through efficient energy transfer. The complexes also underwent isomerization in the presence of catalysts, allowing for mass production. The resulting hyper-OLED displayed true-blue color and high external quantum efficiency, paving the way for innovative blue OLED technology.
NATURE COMMUNICATIONS
(2023)
Article
Materials Science, Multidisciplinary
Jie Yan, Min Song, Dong-Ying Zhou, Guowei Ni, Muhua Gu, Shek-Man Yiu, Xiuwen Zhou, Liang-Sheng Liao, Yun Chi
Summary: Efficient saturated red and near-infrared emissive bis-tridentate Ir(III) complexes have been synthesized for the development of organic light-emitting diodes (OLEDs). The resulting OLED devices demonstrate high external quantum efficiencies and emission peak wavelengths.
ADVANCED OPTICAL 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, Multidisciplinary
Ze-Lin Zhu, Jie Yan, Li-Wen Fu, Chen Cao, Ji-Hua Tan, Sheng-Fu Wang, Yun Chi, Chun-Sing Lee
Summary: By modifying Pt(ii) dicarbene pincer complexes, the effect of aromatic substituents on excimer formation was studied. IPrtBuPt showed high stability and ultrahigh luminous efficiency, maintaining blue emission at doping concentrations of up to 20%. Furthermore, the emission of IPrtBuPt significantly overlapped with the absorption of nu-DABNA, achieving high EQEs, narrow FWHM, and specific CIE coordinates in a hyper-OLED structure.
MATERIALS CHEMISTRY FRONTIERS
(2023)
Article
Chemistry, Inorganic & Nuclear
Guowei Ni, Jie Yan, Yixin Wu, Fan Zhou, Pi-Tai Chou, Yun Chi
Summary: Third-row transition-metal complexes are crucial in the production of light-emitting layers for OLED technology. It is essential to extend their emission wavelengths to true-blue and near-infrared regions to enhance the performance and enable new applications. This chemistry frontier article elaborates on using transition metals like iridium and platinum and carefully designed chelates to assemble advanced emitters.
INORGANIC CHEMISTRY FRONTIERS
(2023)
Article
Nanoscience & Nanotechnology
Eun Hae Cho, Hye-Ryung Choi, Yongjin Park, So Yeong Jeong, Young Jin Song, Yong Ha Hwang, Junwoo Lee, Yun Chi, Sheng-Fu Wang, Yongmin Jeon, Chang-Hun Huh, Kyung Cheol Choi
Summary: This study focuses on wearable and wavelength-tunable near-infrared organic light-emitting diodes (NIR OLEDs) that use a silver electrode instead of the traditional indium tin oxide (ITO) electrode. The NIR OLEDs show stable operation and wavelength tuning capabilities, and have a promoting effect on cell proliferation under NIR light irradiation, indicating their potential for efficacious phototherapy.
ACS APPLIED MATERIALS & INTERFACES
(2023)