Review
Materials Science, Multidisciplinary
Muazzam Idris, Savannah C. Kapper, Abegail C. Tadle, Thilini Batagoda, Daniel Sylvinson Muthiah Ravinson, Opeoluwa Abimbola, Peter Djurovich, Jongchan Kim, Caleb Coburn, Stephen R. Forrest, Mark E. Thompson
Summary: The photophysical and electrochemical properties of N-heterocyclic carbene complexes of Iridium (III) were studied, showing differences in emission maxima and quantum yield in different solvents. The complexes exhibited efficient emission in polystyrene at room temperature and low temperatures. Notably, fac-Ir(tpz)(3) showed high external electroluminescence efficiency and brightness in blue phosphorescent organic light emitting diodes.
ADVANCED OPTICAL MATERIALS
(2021)
Article
Chemistry, Inorganic & Nuclear
Johannes Soellner, Thomas Strassner
Summary: Iridium(III) complexes with cyclometalating ligands have excellent properties for use as phosphorescent emitters in organic light emitting diodes. A series of complexes with 2-phenyl-pyridine and bis(pyrazolyl)borate ligands showed nearly unitary quantum yields and short excited state lifetimes in sky-blue to green emissions.
EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
(2021)
Article
Materials Science, Multidisciplinary
Bo-Sun Yun, So-Yoen Kim, Jin-Hyoung Kim, Ho-Jin Son, Sang Ook Kang
Summary: In this study, NHC-Ir complexes utilizing DBT and DBF moieties to enhance deep-blue phosphorescence emission efficiency were synthesized and compared for their electrochemical and photophysical properties. The use of DBT moieties resulted in longer emission wavelengths, while the meridional isomer exhibited easier oxidation and red-shifted emission compared to facial forms. The replacement of the oxygen atom in the DBF unit with sulfur did not significantly alter the emission efficiency, achieving high-end deep-blue phosphorescence with unprecedented CIE coordinates.
JOURNAL OF MATERIALS CHEMISTRY C
(2021)
Article
Chemistry, Inorganic & Nuclear
Yongjun Song, Renyou Yu, Mengzhen Chen, Lei He
Summary: This study reports the development of fluorine-free cyan to deep blue emissive cationic Ir(III) complexes with phenylimidazole-type cyclometalated ligands, showing good emission properties in both solution and diluted films, as well as promising applications in OLEDs and solid-state LEECs.
INORGANIC CHEMISTRY
(2021)
Article
Biochemistry & Molecular Biology
Ben Liu, Jing Long, Meng Zhang, Kaiming Cheng, Xin Gao, Yibo Zhou, Yi Li, Zilong Tang, Wei Zhang
Summary: This study successfully achieved the goal of detecting H2S in mitochondria through exploring an iridium complex, which displays high selectivity and sensitivity, low cell toxicity, and has been successfully used for in vitro and in vivo H2S imaging.
JOURNAL OF INORGANIC BIOCHEMISTRY
(2022)
Article
Chemistry, Inorganic & Nuclear
So-Yoen Kim, Jin-Hyoung Kim, Sanghun Lee, Bo-Sun Yun, Ho-Jin Son, Sang Ook Kang
Summary: It was found that the excited state properties of pim-based Ir(III) complexes can be modulated by the nature of the peripheral substituent and the presence of an EWG substituent. Incorporation of bulky TPh/ITPh substituents in the second coordination sphere significantly enhanced emission efficiencies, enabling efficient blue electroluminescence. Among the fabricated blue emitting TPh/ITPh-substituted Ir(III) complexes, Ir(ITPhpim-F)3, Ir(TPhpim-F2)3, and Ir(ITPhpim-F2)3 showed high solid radiative quantum yields and were tested as blue-emitting dopants for blue phosphorescent OLEDs. Ir(ITPhpim-F)3-doped multilayer device exhibited the best performance with a maximum external quantum efficiency of 21.0%, a maximum current efficiency of 43.6 cd/A, and CIE coordinates of 0.18 and 0.31.
INORGANIC CHEMISTRY
(2022)
Article
Chemistry, Physical
Peng Tao, Xiao-Kang Zheng, Xiao-Zhen Wei, Mei-Tung Lau, Yuk-Ki Lee, Zi-Kang Li, Ze-Ling Guo, Fang-Qing Zhao, Xing Liu, Shu-Juan Liu, Qiang Zhao, Yan-Qin Miao, Wai-Yeung Wong
Summary: Three efficient yellow iridium(III) complexes were designed using a chlorine-functionalization method, exhibiting extremely broad emission bandwidths and bright yellow phosphorescence in N-2-saturated dichloromethane with high photoluminescence efficiency. These complexes show great potentials in developing high-performance yellow and white electroluminescence, with high external quantum efficiency realized in the prepared OLEDs.
MATERIALS TODAY ENERGY
(2021)
Article
Chemistry, Inorganic & Nuclear
Angela Vivancos, Delia Bautista, Pablo Gonzalez-Herrero
Summary: This study reports the synthesis, structure, photophysical properties, and electrochemistry of the first series of Pt(IV) tris-chelates bearing cyclometalated aryl-NHC ligands. The complexes exhibit significant photostability, long-lived phosphorescence, and potential application for Pt(IV) emitters with tunable properties.
INORGANIC CHEMISTRY
(2022)
Article
Chemistry, Multidisciplinary
Sareh Paziresh, Reza Babadi Aghakhanpour, Hamid R. Shahsavari, Vahideh Dolatyari, Irene Ara, S. Masoud Nabavizadeh
Summary: In this study, a series of cyclometalated Ir(iii) complexes were synthesized and characterized. The complexes showed strong red emissions with different quantum efficiencies. The emissions mainly originated from (MLCT)-M-3 character, and the esteric functional group on the ligand could be easily converted to increase water solubility. The emission properties of the complexes were sensitive to pH, and the emission intensity and lifetime values changed with varying pH values.
NEW JOURNAL OF CHEMISTRY
(2023)
Article
Chemistry, Inorganic & Nuclear
Sergej Stipurin, Thomas Strassner
Summary: Three different imidazolylidene ligand precursors with methyl groups in 4- and 5-position were synthesized to build a series of nine cyclometalated platinum(II) complexes, using β-diketonate and bis(pyrazolyl)borate motifs as auxiliary ligands. The synthesized platinum complexes exhibit room temperature phosphorescence in a PMMA matrix with high quantum yields and specific color coordinates. Additional insight into the properties of these compounds was gained through quantum chemical calculations and electrochemical experiments.
JOURNAL OF ORGANOMETALLIC CHEMISTRY
(2023)
Article
Chemistry, Applied
Chan Hee Ryu, Junseop Lim, Mingi Kim, Ilsup Shin, Jun Yeob Lee, Kang Mun Lee
Summary: Researchers have developed a blue-emitting iridium complex, IrTrz, based on a 1,2,4-triazole ligand, which exhibits stable blue emission, high thermal stability, and excellent electrochemical stability. Multilayer phosphorescent OLEDs using IrTrz as the blue emitter show low turn-on voltages and high external quantum efficiencies, with stable operational lifetimes exceeding 690 h.
Article
Materials Science, Multidisciplinary
Junhyuk Jang, Chandana Sampath Kumara Ranasinghe, Akash Thamarappalli, Mile Gao, Manikandan Koodalingam, Paul L. Burn, Emma Puttock, Paul E. Shaw
Summary: Two light-emitting dendrimers, composed of red phosphorescent core and either blue or green TADF dendrons, were prepared. The dendrons acted as energy pools for emission from the core, and blending with a specific material improved the luminescence efficiency.
JOURNAL OF MATERIALS CHEMISTRY C
(2022)
Article
Chemistry, Inorganic & Nuclear
Sergej Stipurin, Thomas Strassner
Summary: The combination of strong electron-withdrawing groups in cyclometalated N-heterocyclic carbene ligands with known beneficial auxiliary ligands in phosphorescent platinum(II) complexes results in efficient light-to-deep-blue emission with quantum yields of up to 92%. The compounds were characterized and studied for their photophysical, electrochemical, and thermal properties, with three complexes being characterized by solid-state structures. Density functional theory calculations were performed using PBE0/6-311G* with dispersion correction.
INORGANIC CHEMISTRY
(2021)
Article
Optics
Qi Zhu, Liang Zhou, Weiqiang Liu, Yingjie Cui, Ruixia Wu, Jiahai Wang, Qingduo Duanmu
Summary: An efficient blue organic electroluminescent device was achieved by optimizing the double light-emitting layers structure, selecting appropriate host materials, and adjusting the doping concentration. The device exhibited good thermal stability and high current efficiency, making it a promising candidate for practical applications in the field of optoelectronics.
OPTICS AND LASER TECHNOLOGY
(2021)
Article
Chemistry, Multidisciplinary
Chengcheng Wu, Kai-Ning Tong, Kefei Shi, Zhaoyun Jin, Yuan Wu, Yingxiao Mu, Yanping Huo, Man-Chung Tang, Chen Yang, Hong Meng, Feiyu Kang, Guodan Wei
Summary: By introducing bulky trimethylsilyl (TMS) groups, two newly designed and synthesized [3+2+1] iridium complexes, doped with a terminal emitter of v-DABNA, exhibit coincident overlapping spectra between the emission of these two phosphors and the absorption of v-DABNA, enabling efficient triplet harvesting through cascade resonant energy transfer. The optimized hyper-OLEDs achieve a high external quantum efficiency of 31.06%, pure blue emission peak at 467 nm with narrow full width at half maxima (FWHM) of 18 nm, and a CIEy value of 0.097, meeting the requirements for saturated blue OLEDs display set by the National Institute of Standards and Technology (NIST). Furthermore, the hyper-OLEDs demonstrate an impressive converted lifetime (LT50) of up to 4552 h at a brightness of 100 cd m(-2), indicating effective Förster resonance energy transfer (FRET) process. These results highlight the potential of employing bulky TMS substituent [3+2+1] iridium(III) complexes as effective sensitizers for the development of high efficiency and stable blue OLEDs in display and lighting applications.
Article
Chemistry, Inorganic & Nuclear
Robert M. Edkins, Yu-Ting Hsu, Mark A. Fox, Dmitry Yufit, Andrew Beeby, Ross J. Davidson
Summary: The synthesis and comparison of Bis-heteroleptic and tris-heteroleptic iridium complexes were studied. Diversified intermediate complexes with different emission and redox properties were successfully synthesized using a chemistry-on-the-complex approach. This convenient synthetic method simplifies the access to Ir(L-a)(L-b)(acac) complexes with varying properties.
Article
Chemistry, Inorganic & Nuclear
Ziwei Wang, Lijuan Li, Weijin Wang, Runlin Wang, Guangzhe Li, Hang Bian, Dongxia Zhu, Martin R. R. Bryce
Summary: In this study, cyclometalated Ir(iii) complexes were designed and synthesized, and were successfully assembled into nanoparticles. These nanoparticles exhibit long wavelength absorption and near-infrared emission, overcoming the limitation of strong absorption in the UV-vis region. Moreover, the nanoparticles show good biocompatibility, high O-1(2) generation ability, potent cytotoxicity towards cancer cells, and superior cellular uptake. This work expands the potential applications of transition metal complex photosensitizers in clinical settings.
DALTON TRANSACTIONS
(2023)
Article
Chemistry, Multidisciplinary
Iain A. A. Wright, Marc K. K. Etherington, Andrei S. S. Batsanov, Andrew P. P. Monkman, Martin R. R. Bryce
Summary: Heterocyclic dimers composed of butterfly-shaped phenothiazine and its oxidized form have been synthesized and studied. The presence of certain substituents induces a twist in the dimers. Various analytical techniques, including X-ray crystallography and optical spectroscopy, have been used to understand the relationship between oxidation state, conformational restriction, and emission mechanisms. The mixed dimer exhibits both thermally activated delayed fluorescence and room temperature phosphorescence.
CHEMISTRY-A EUROPEAN JOURNAL
(2023)
Article
Nanoscience & Nanotechnology
Liping Zhang, Ya-chao Wang, Yuqi Liao, Qian Zhang, Xia Liu, Dongxia Zhu, Haixing Feng, Martin R. Bryce, Lijie Ren
Summary: This study presents a novel approach for the treatment of ischemic stroke using BDP-4/Cur-CL nanoparticles. These nanoparticles can release visible light signals for real-time monitoring of the progression of ischemia reperfusion brain injury, while also releasing curcumin for safe treatment. The experimental results demonstrate excellent anti-apoptotic and anti-inflammatory effects of this method, effectively improving the cognitive abilities of stroke mice.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Review
Chemistry, Multidisciplinary
Haoran Wang, Qiyao Li, Parvej Alam, Haotian Bai, Vandana Bhalla, Martin R. Bryce, Mingyue Cao, Chao Chen, Sijie Chen, Xirui Chen, Yuncong Chen, Zhijun Chen, Dongfeng Dang, Dan Ding, Siyang Ding, Yanhong Duo, Meng Gao, Wei He, Xuewen He, Xuechuan Hong, Yuning Hong, Jing-Jing Hu, Rong Hu, Xiaolin Huang, Tony D. James, Xingyu Jiang, Gen-ichi Konishi, Ryan T. K. Kwok, Jacky W. Y. Lam, Chunbin Li, Haidong Li, Kai Li, Nan Li, Wei-Jian Li, Ying Li, Xing-Jie Liang, Yongye Liang, Bin Liu, Guozhen Liu, Xingang Liu, Xiaoding Lou, Xin-Yue Lou, Liang Luo, Paul R. McGonigal, Zong-Wan Mao, Guangle Niu, Tze Cin Owyong, Andrea Pucci, Jun Qian, Anjun Qin, Zijie Qiu, Andrey L. Rogach, Bo Situ, Kazuo Tanaka, Youhong Tang, Bingnan Wang, Dong Wang, Jianguo Wang, Wei Wang, Wen-Xiong Wang, Wen-Jin Wang, Xinyuan Wang, Yi-Feng Wang, Shuizhu Wu, Yifan Wu, Yonghua Xiong, Ruohan Xu, Chenxu Yan, Saisai Yan, Hai-Bo Yang, Lin-Lin Yang, Mingwang Yang, Ying-Wei Yang, Juyoung Yoon, Shuang-Quan Zang, Jiangjiang Zhang, Pengfei Zhang, Tianfu Zhang, Xin Zhang, Xin Zhang, Na Zhao, Zheng Zhao, Jie Zheng, Lei Zheng, Zheng Zheng, Ming-Qiang Zhu, Wei-Hong Zhu, Hang Zou, Ben Zhong Tang
Summary: This review provides a comprehensive summary of the applications of aggregation-induced emission (AIE) luminogens in biological imaging, dynamic physiological processes, disease diagnosis and treatment, and specific analyte detection and monitoring. The review also discusses critical issues and future directions, aiming to promote the development of AIE in the fields of life and health.
Article
Chemistry, Inorganic & Nuclear
Ahmed M'hamedi, Andrei S. Batsanov, Mark A. Fox, Juan A. Aguilar, Martin R. Bryce
Summary: Six new diiridium complexes with 2-methyl-6-phenylpyridyl as the cyclometalating ligand and mu(2)-oxamidato or mu(2)-dithioxamidato as the bridging ligand have been synthesized. The presence of multiple isomers in these complexes was confirmed by NMR and X-ray crystallography, and computational calculations supported the experimental findings. The emission spectra of these complexes were attributed to mixed metal-ligand to ligand charge transfer excited states.
EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
(2023)
Article
Pharmacology & Pharmacy
Yichun Shen, Yitian Xiao, Robert M. Edkins, Tristan G. A. Youngs, Terri-Louise Hughes, James Tellam, Katharina Edkins
Summary: Hydrotropism is a method to increase the solubility of drugs, and the behavior of caffeine and sodium benzoate in water has been studied using NMR spectroscopy and neutron total scattering. Strong interactions between caffeine and sodium benzoate, as well as hydrogen bonding between benzoate and water, are found to enhance the solubility of caffeine in water. The distortion of water structure and the stronger interaction between caffeine and water are additional mechanisms for solubility enhancement. NMR spectroscopy and neutron total scattering can provide a comprehensive understanding of hydrotropic solutions.
INTERNATIONAL JOURNAL OF PHARMACEUTICS
(2023)
Article
Chemistry, Physical
Rebecca J. Salthouse, Juan Hurtado-Gallego, Iain M. Grace, Ross Davidson, Ohud Alshammari, Nicolas Agrait, Colin J. Lambert, Martin R. Bryce
Summary: We studied a series of thiomethyl anchored cross-conjugated molecules and their skipped-conjugated alcohol derivatives using experimental and theoretical methods. The conductance values of the cross-conjugated molecules and their skipped-conjugated partners were found to be similar. Theoretical studies revealed that the conductance of the alcohol series of compounds varied more with the tilt angle. Thermopower measurements showed that the cross-conjugated ketone molecules had a higher Seebeck coefficient compared to the alcohol derivatives, with a particularly high value for the biphenyl derivative 3a.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Polymer Science
Nan Jiang, Ke-Xin Li, Wei Xie, Shu-Ran Zhang, Xin Li, Yue Hu, Yan-Hong Xu, Xing-Man Liu, Martin R. Bryce
Summary: In this study, clusters with different extents of aggregation were successfully prepared by heat-induced or light-triggered methods, and the multicolor fluorescence of a single polymeric material was controllably regulated. The luminescence behavior of the material varied with the microscopic control of the aggregation structure. This research provides a template for developing new materials for multicolor fluorescence and demonstrates the potential of PUE as a smart material through the construction of a pattern with encryption, anticounterfeiting, and information transmission functions.
Article
Multidisciplinary Sciences
Andrea Gemma, Fatemeh Tabatabaei, Ute Drechsler, Anel Zulji, Herve Dekkiche, Nico Mosso, Thomas Niehaus, Martin R. Bryce, Samy Merabia, Bernd Gotsmann
Summary: By combining the break junction technique with a suspended heat-flux sensor, the researchers measured the total thermal and electrical conductance of a single molecule, at room temperature, along with its Seebeck coefficient. The result is in agreement with predictions and opens new opportunities for thermoelectric applications.
NATURE COMMUNICATIONS
(2023)
Review
Chemistry, Multidisciplinary
Saliha Oner, Martin R. R. Bryce
Summary: This review focuses on the fused-ring carbazole derivatives, their design, properties, and applications in OLEDs. The appeal of these materials lies in their extended π-electron systems, thermal stability, tunable orbital energies, high photoluminescence quantum yields, and versatility for chemical functionalisation. The review is divided into sections based on the molecules' roles in OLEDs, including conventional emitters, hosts for phosphorescent emitters, TADF emitters, and MR emitters. The challenges and opportunities for these derivatives in OLEDs and other optoelectronic applications are also discussed.
MATERIALS CHEMISTRY FRONTIERS
(2023)
Article
Chemistry, Multidisciplinary
Luke J. O'Driscoll, Michael Jay, Benjamin J. Robinson, Hatef Sadeghi, Xintai Wang, Becky Penhale-Jones, Martin R. Bryce, Colin J. Lambert
Summary: The synthesis of alkanethiol molecules with planar aromatic head groups for anchoring molecules to graphene electrodes is investigated. The conductance of self-assembled monolayers on a gold surface shows that graphene coated probes have higher conductance than platinum probes. The study confirms the effectiveness of planar aromatic head groups as anchoring units, but highlights the importance of considering the size and geometry of these groups for molecular design.
NANOSCALE ADVANCES
(2023)
Article
Materials Science, Multidisciplinary
Nan Jiang, Ke-Xin Li, Jia-Jun Wang, Chen-Sen Li, Xiao-Yu Xu, Yan-Hong Xu, Martin R. Bryce
Summary: This article presents the achievement of cluster-induced aggregation, multicolour luminescence, and ultra-long phosphorescence in non-conjugated luminescent polymers (NCLPs) based on linear polyurethane derivatives. By adjusting the reaction temperature and time, the authors successfully prepared NCLPs with ultra-long room temperature phosphorescence lifetime of 0.45 s. DFT calculations and molecular dynamics simulations provided detailed microstructural information on the polyurethane derivatives, revealing the underlying luminous mechanism. The potential of the polyurethane derivatives in information security was validated through experimental encryption/decryption models. These findings have important implications for understanding unconventional luminescence mechanisms and strategic design of NCLPs for practical applications.
JOURNAL OF MATERIALS CHEMISTRY C
(2023)
Review
Chemistry, Multidisciplinary
Haoran Wang, Qiyao Li, Parvej Alam, Haotian Bai, Vandana Bhalla, Martin R. Bryce, Mingyue Cao, Chao Chen, Sijie Chen, Xirui Chen, Yuncong Chen, Zhijun Chen, Dongfeng Dang, Dan Ding, Siyang Ding, Yanhong Duo, Meng Gao, Wei He, Xuewen He, Xuechuan Hong, Yuning Hong, Jing-Jing Hu, Rong Hu, Xiaolin Huang, Tony D. James, Xingyu Jiang, Gen-ichi Konishi, Ryan T. K. Kwok, Jacky W. Y. Lam, Chunbin Li, Haidong Li, Kai Li, Nan Li, Wei-Jian Li, Ying Li, Xing-Jie Liang, Yongye Liang, Bin Liu, Guozhen Liu, Xingang Liu, Xiaoding Lou, Xin-Yue Lou, Liang Luo, Paul R. McGonigal, Zong-Wan Mao, Guangle Niu, Tze Cin Owyong, Andrea Pucci, Jun Qian, Anjun Qin, Zijie Qiu, Andrey L. Rogach, Bo Situ, Kazuo Tanaka, Youhong Tang, Bingnan Wang, Dong Wang, Jianguo Wang, Wei Wang, Wen-Xiong Wang, Wen-Jin Wang, Xinyuan Wang, Yi-Feng Wang, Shuizhu Wu, Yifan Wu, Yonghua Xiong, Ruohan Xu, Chenxu Yan, Saisai Yan, Hai-Bo Yang, Lin-Lin Yang, Mingwang Yang, Ying-Wei Yang, Juyoung Yoon, Shuang-Quan Zang, Jiangjiang Zhang, Pengfei Zhang, Tianfu Zhang, Xin Zhang, Xin Zhang, Na Zhao, Zheng Zhao, Jie Zheng, Lei Zheng, Zheng Zheng, Ming-Qiang Zhu, Wei-Hong Zhu, Hang Zou, Ben Zhong Tang
Summary: This review provides a comprehensive summary of the advantages and applications of aggregation-induced emission (AIE) luminogens in imaging of biological structure, dynamic physiological processes, disease diagnosis and treatment, as well as detection and monitoring of specific analytes. It also discusses future directions to promote research and development in the fields of life and health.
Article
Chemistry, Physical
Xintai Wang, Ali Ismael, Shanglong Ning, Hanan Althobaiti, Alaa Al-Jobory, Jan Girovsky, Hippolyte P. A. G. Astier, Luke J. O'Driscoll, Martin R. Bryce, Colin J. Lambert, Christopher J. B. Ford
Summary: This study investigates the effect of the molecule-electrode interface in SAMs using a micro-pore device, overcoming challenges with the tetrapodal anchor and single layered graphene top electrode with an ionic liquid gate. Experimental results show that molecules with the same backbone but different molecule-electrode interfaces exhibit significantly different conductances near zero bias.
NANOSCALE HORIZONS
(2022)