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
Chemistry, Multidisciplinary
Moon Chul Jung, John Facendola, Jongchan Kim, Daniel Sylvinson Muthiah Ravinson, Peter Djurovich, Stephen R. Forrest, Mark E. Thompson
Summary: The orientation of facial tris-cyclometalated iridium complexes in doped films can be controlled by altering the physical shape and electronic asymmetry in the molecular structure. Oblate iridium complexes have a net horizontal alignment in the thin films due to favorable van der Waals interaction with the host material, while chemical asymmetries introduced by substituents affect the oblate shapes and orientation of the molecules. The fluorinated patches in the substituted derivatives reinforce horizontal alignment during deposition, resulting in improved efficiency in organic light emitting diodes.
ADVANCED MATERIALS
(2021)
Article
Chemistry, Applied
Jia-Wei Liu, Han-Chen Zhou, Zi-Kun Wang, Xiong Tang, Hua-Yu Wu, Shi Wang, Wen-Yong Lai, Yong-Hua Li
Summary: This study modified 1,3,4-oxadiazole and synthesized Ir(III) complexes to investigate the effects of different coordination modes on their photophysical and electrochemical properties. High-performance electroluminescence devices were successfully fabricated using the obtained complexes.
Article
Chemistry, Multidisciplinary
Zijian Liu, Si-Wei Zhang, Meng Zhang, Chengcheng Wu, Wansi Li, Yuan Wu, Chen Yang, Feiyu Kang, Hong Meng, Guodan Wei
Summary: The successful synthesis of the novel iridium (III) complex Ir-dfpMepy-CN has opened a new pathway for developing advanced blue emitters and dopant alternatives for future efficient blue PhOLEDs, exhibiting high quantum efficiency and deeper blue emission.
FRONTIERS IN CHEMISTRY
(2021)
Article
Chemistry, Multidisciplinary
Gang Xie, Xin Li, Yang Pan, Shuo Huang, Jiarong Xu, Zhiping Wang, Shungao Yin, Aihui Liang
Summary: Two new pyrimidine-based iridium complexes, (TPAPr)(2)IrAcac and (TPSPr)(2)IrAcac, were synthesized and characterized. Both complexes showed excellent thermal stability and high photoluminescence quantum yields. (TPSPr)(2)IrAcac achieved higher photoluminescence quantum yield and current efficiency at higher dopant concentration due to its bulky tetraphenylsilane group, while DFT studies revealed faster non-radiative transitions for (TPSPr)(2)IrAcac. Green phosphorescent polymer light-emitting diodes (PLEDs) containing these complexes exhibited exceptional device performance and stable phosphorescent emission.
CHEMISTRY-A EUROPEAN JOURNAL
(2023)
Article
Materials Science, Multidisciplinary
Maho Kitahara, Kengo Hara, Seika Suzuki, Hiroshi Iwasaki, Shigeyuki Yagi, Yoshitane Imai
Summary: In this study, optically inactive racemic phosphorescent iridium(III) luminophores were embedded into the luminescent active layer of each device, generating red-green-blue-yellow (RGBY)-full-color external magnetic field-driven circularly polarized electroluminescence (CPEL) from organic light-emitting diodes (OLEDs). Despite the use of chirality-free organic iridium(III) luminophores, full-color magnetic CPELs (MCPELs) were successfully generated with high efficiency in the MCP-OLED system.
ORGANIC ELECTRONICS
(2023)
Article
Chemistry, Applied
Man Chen, Fujun Zhang, Man Zhang, Yan Wang, Pin Wang, Song Wang, Bihai Tong, Ping Chen, Hui Kong
Summary: To inhibit concentration quenching, new bis-tridentate iridium complexes modified with triptycene groups were synthesized. The triptycene endows these complexes with high photoluminescence quantum yields and low concentration quenching. The doped OLED device based on the modified complex exhibits significantly improved electroluminescent efficiencies compared to the reference device.
Article
Chemistry, Physical
Wansi Li, Zhaoming Wang, Meng Zhang, Miao He, Si-Wei Zhang, Chen Yang, Yuan Wu, Jingzhou Li, Man-Chung Tang, Hongyan Fu, Guodan Wei
Summary: An efficient yellow-emitting iridium (III) phosphorescent material has been designed for solid-state white light-emitting diodes, achieving high luminous efficiency and stable data transmission rates through optimization of material formulation and LED operating parameters. This research contributes to the advancement of white light communication and warm white light illumination fields.
MATERIALS TODAY ENERGY
(2022)
Article
Materials Science, Multidisciplinary
Wanyun Zhang, Yi Zhang, Ling Lu, Siyu Zhao, Xinwen Zhang, Qinghua Zhao
Summary: The design and synthesis of four novel iridium (III) complexes carrying a hole-transporting carbazole/arylamine group, and/or an electron-transporting phosphine group, were reported based on iridium (III) [bis(4,6-difluorophenyl)pyridinato-N,C2]picolinate (FIrpic). Among them, the bluish green device with (Cz)(2)Ir(pic) showed the highest efficiencies. Compared to other iridium complexes, the efficiency roll-off decreases more slowly for the device based on (Cz)(2)Ir(pic).
Article
Chemistry, Inorganic & Nuclear
Zi-Jian Yao, Yong-Xu Jin, Wei Deng, Zhen-Jiang Liu
Summary: A series of cationic cyclometalated iridium(III) complexes with o-carborane cage on the main ligand of 2-phenylbenzothiazole were synthesized and characterized. The different substitution positions of o-carborane on the 2-phenylbenzothiazole ring led to significant differences in the emission properties of the synthesized complexes. The presence of an o-carborane fragment promoted strong fluorescence intensity in certain complexes, serving as a tool to effectively enhance fluorescence properties.
INORGANIC CHEMISTRY
(2021)
Article
Chemistry, Multidisciplinary
Yuanyuan Luo, Zheng Liu, Ge Yang, Tianhong Wang, Zhengyang Bin, Jingbo Lan, Di Wu, Jingsong You
Summary: This study demonstrates the potential of multi-aryl spirobifluorenes as PHC hosts and provides a new approach for their synthesis.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2021)
Article
Crystallography
Hu Dou, Lu Wang, Gan Ren, You-Quan Dan, Xin-Tong Zhong, Jia-Yi Ou, Jia-Yi Yuan, Yu-Tian Zhong
Summary: A tunable light-mixing liquid crystal lens-like cell (LCLC) is proposed to improve the color shift and viewing angle performance of displays. By using LCLC, low color shift can be achieved at different viewing angles, and brightness can be diffused to large viewing angles.
Article
Chemistry, Analytical
Aya Hekmet Makki, Si-Hyun Park
Summary: This study focuses on tuning the emission color of tris(8-hydroxyquinoline) aluminum complexes by using zinc oxide quantum dots, with higher concentrations leading to decreased crystallinity, a slight red shift in emission peaks, and yellow emission observed at concentrations of 20% and 30% zinc oxide quantum dots.
Article
Chemistry, Inorganic & Nuclear
Meng Wu, Nengquan Li, Chao Shi, Jialiang Song, Ruoqi Zeng, Feiyang Li, Qiuxia Li, Aihua Yuan, Chuluo Yang
Summary: We have designed and synthesized a new B- and N-embedded asymmetric heteroleptic phosphorescent iridium(iii) complex IrBNacac, which exhibits ambipolar characteristics. The complex shows good planarity and rich pi-pi interactions in the crystal state. It also exhibits effective red emission in the thin film state with a very narrow full width at half maximum, even narrower than that of model complexes. Considered the good photophysical properties and solubility, it was used as the emitting layer of an OLED device and showed good performance.
INORGANIC CHEMISTRY FRONTIERS
(2023)
Article
Chemistry, Inorganic & Nuclear
Marsel Z. Shafikov, Ross Martinscroft, Craig Hodgson, Anna Hayer, Armin Auch, Valery N. Kozhevnikov
Summary: This study reports the design, synthesis and luminescent properties of a dinuclear Ir(III) complex, which showed superior photophysical properties compared to its mononuclear analogues. The complex exhibited highly efficient red emission and a faster radiative rate. Temperature-dependent studies revealed behaviors reminiscent of thermally activated delayed fluorescence (TADF) in both the dinuclear and mononuclear complexes.
INORGANIC CHEMISTRY
(2021)
Article
Polymer Science
Di Liu, Christopher W. Bielawski
POLYMER INTERNATIONAL
(2017)
Article
Chemistry, Multidisciplinary
Wontae Joo, Wade Wang, Ryan Mesch, Kensuke Matsuzawa, Di Liu, C. Grant Willson
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2019)
Article
Chemistry, Multidisciplinary
Di Liu, Alvaro D. Sponza, Dandan Yang, Melanie Chiu
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2019)
Article
Nanoscience & Nanotechnology
Deli Li, Jiuyan Li, Di Liu, Wei Li, Chang-Lun Ko, Wen-Yi Hung, Chunhui Duan
Summary: A highly efficient sky-blue PhOLED was successfully fabricated using a newly developed bipolar host material o-PyCNBCz, achieving a maximum external quantum efficiency of 29.4% at a practical luminance. Compared to its isomer, o-PyCNBCz outperforms in terms of charge transportation balance, photoluminescent quantum yields, and emitting dipole orientation, leading to its superior performance in PhOLEDs.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Materials Science, Multidisciplinary
Shuaijun Hao, Hong Wang, Ruisong Yang, Di Liu, Xiaohua Liu, Qiang Zhang, Xinkuan Chen
Summary: A corn-like mesoporous SnO2/alpha-Fe2O3 heterostructure was successfully prepared through a simple one-step hydrothermal route, showing high response to 100 ppm TEA. The unique morphology and structure of the composite material, as well as the implantation of Sn4+, played crucial roles in its outstanding gas-sensing performance.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2021)
Article
Chemistry, Multidisciplinary
Xiaohui Li, Chenjue Tang, Di Liu, Zhefan Yuan, Hsiang-Chieh Hung, Sijin Luozhong, Wenchao Gu, Kan Wu, Shaoyi Jiang
Summary: By constructing a pure zwitterionic triple-network (ZTN) hydrogel, both high mechanical strength and excellent nonfouling properties can be achieved; the strong electrostatic interaction and network entanglement within the structure effectively increase the toughness of the hydrogel, resulting in high strength, toughness, and stiffness in saline environments.
ADVANCED MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
Ruizhi Dong, Di Liu, Jiuyan Li, Mengyao Ma, Yongqiang Mei, Deli Li, Jingyang Jiang
Summary: PyDCN was designed to construct TADF emitters with high radiative transition rate constants and photoluminescence quantum yields, showing good electroluminescence properties and balanced charge transportation. By doping PyDCN-DMAC and PyDCN-PXZ in OLEDs, blue-green and yellow electroluminescence were achieved respectively. Combining PyDCN-DMAC with a homemade TADF emitter PP-PXZ to fabricate an all-TADF white OLED, high external quantum yield and excellent color stability were obtained.
MATERIALS CHEMISTRY FRONTIERS
(2021)
Article
Materials Science, Multidisciplinary
Yuehao Fu, Hong Wang, Xiaohua Liu, Di Liu, Jiawei Wan, Shuaijun Hao, Qiang Zhang, Xingkuan Chen, Zhipeng Zen, Hong Xin
Summary: In this study, urchin-like core-shell In2O3/ZnO nanocomposites with mesoporous structure and high specific surface area were prepared via a facile solvothermal method. The sensor based on these nanocomposites showed excellent gas-sensing performance to triethylamine (TEA), attributed to the special urchin-like structure with mesoporous and high specific surface area, plentiful oxygen vacancies, and the formation of n-n heterojunction.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2022)
Article
Chemistry, Applied
Yongqiang Mei, Di Liu, Jiuyan Li, Jiahui Wang
Summary: It is important to align the locally excited and charge-transfer states of TADF materials for efficient reverse intersystem crossing. In this study, a series of D-A type TADF emitters were developed by attaching different donors to the acceptor. By introducing different functional groups on the acceptor, the energy levels of different states were tuned. Compounds with trifluoromethyl substitution showed high quantum efficiency and radiation constants.
Article
Chemistry, Multidisciplinary
Pranab Sarker, Tieyi Lu, Di Liu, Guangyao Wu, Hanning Chen, Md Symon Jahan Sajib, Shaoyi Jiang, Zhan Chen, Tao Wei
Summary: Using simulations and spectroscopy, we studied the hydration behaviors of zwitterionic materials to understand their fouling-resistant mechanism and provide a design principle for improved performance. Our findings show that hydrogen bonding, net charge, and dipole moment are crucial to the fouling-resistant capabilities of zwitterionic materials. Shortening the zwitterionic spacing strengthens hydrogen bonding and reduces the dipole moment, making zwitterionic materials more resistant to fouling. Among the studied materials, TMAO exhibits the strongest hydrogen bonding, the smallest net charge, and the minimum dipole moment, making it an excellent nonfouling material.
Article
Materials Science, Multidisciplinary
Xianghong Zhang, Shengyuan Wu, Rengjian Yu, Enlong Li, Di Liu, Changsong Gao, Yuanyuan Hu, Tailiang Guo, Huipeng Chen
Summary: In this study, a multi-neuromorphic functional device based on the 2D material Mxene was proposed for the first time. The device can realize synaptic or neuronal function and improve the efficiency and accuracy of the neuromorphic network.
Article
Chemistry, Multidisciplinary
Wenkui Wei, Jiuyan Li, Di Liu, Yongqiang Mei, Ying Lan, Houru Tian, Rui Niu, Botao Liu
Summary: The study focused on developing deep blue and pure blue organic light-emitting diodes using a series of donor-acceptor-donor type emitters. The molecular engineering of these emitters led to improved performance, with OLEDs exhibiting emission with specific CIE coordinates and maximum external quantum efficiencies. This research provides a valuable strategy for designing more efficient deep blue emitters in the future.
NEW JOURNAL OF CHEMISTRY
(2021)
Article
Chemistry, Multidisciplinary
Zhixin Li, Yukun Shi, Di Liu, Shengjie Song, Liu Zhao, Ying Guo, Lidong Chen, Xiangsheng Wang, Xinwen Guo, Weiguo Cheng
Summary: Significant progress has been made in developing a new catalyst and utilizing single-stage reactor for efficient hydrorefining of FCC gasoline, resulting in high-quality fuel that meets the National standard VI of vehicle gasoline in China. The synergistic effect between Ni(ii) and HPW(iii) on nanocrystalline HZSM-5 zeolite contributes to the improved catalytic performance of the NiPW-Nano-Z catalyst.
NEW JOURNAL OF CHEMISTRY
(2021)
Review
Chemistry, Organic
Alvaro D. Sponza, Di Liu, Emily P. Chen, Allison Shaw, Lassana Diawara, Melanie Chiu
ORGANIC & BIOMOLECULAR CHEMISTRY
(2020)
Article
Chemistry, Multidisciplinary
Tingting Huang, Di Liu, Deli Li, Wenfeng Jiang, Jingyang Jiang
NEW JOURNAL OF CHEMISTRY
(2019)