Article
Chemistry, Multidisciplinary
Chengjun Wu, Youming Zhang, Jingsheng Miao, Kai Li, Weiguo Zhu, Chuluo Yang
Summary: The design of efficient and stable near-infrared (NIR) electroluminescent materials is challenging due to the high decay rate of non-radiative transitions in long wavelengths. A new tetradentate cyclometalated platinum(II) complex has been developed and used as a dopant for NIR organic light-emitting diodes (OLEDs). The NIR-OLEDs achieved a maximum external quantum efficiency of 5.2% and demonstrated excellent stability with an operational lifetime of 119 hours.
CHINESE CHEMICAL LETTERS
(2023)
Article
Materials Science, Multidisciplinary
Chan Hee Ryu, Seung Chan Kim, Mingi Kim, Sanghee Yi, Jun Yeob Lee, Kang Mun Lee
Summary: This study reports the synthesis of two novel tetradentate Pt(II) complexes and their application as blue phosphorescent emitters in OLED devices. These complexes exhibit intense blue emission, high phosphorescent quantum efficiencies, and thermal stabilities. The devices fabricated using these complexes show outstanding performance and electroluminescent colors.
ADVANCED OPTICAL MATERIALS
(2022)
Article
Chemistry, Inorganic & Nuclear
Sergej Stipurin, Thomas Strassner
Summary: The synthesis of N-heterocyclic carbene precursors and their cyclometalated platinum(II) carbene complexes based on hexahydroimidazo[1,5-a]pyridine are reported in this study. The properties of these platinum complexes were characterized by various techniques, and their photophysical and electrochemical behaviors were investigated. Quantum chemical calculations were used to rationalize the experimental results.
EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
(2022)
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
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
Chemistry, Multidisciplinary
Johannes Soellner, Piermaria Pinter, Sergej Stipurin, Thomas Strassner
Summary: The structural motif of platinum(II) complexes bearing cyclometalating N-heterocyclic carbene ligands can be used to design deep-blue phosphors for organic light-emitting diodes. The use of bis(pyrazolyl)borate-based auxiliary ligands enforces molecular rigidity, inhibiting deformation processes and resulting in highly efficient deep-blue platinum(II) emitters. The steric crowding in the coordination sphere plays a key role in achieving CIE coordinates below (0.15; 0.15).
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2021)
Article
Chemistry, Multidisciplinary
Piotr Pander, Andrey V. Zaytsev, Amit Sil, Glib V. Baryshnikov, Farhan Siddique, J. A. Gareth Williams, Fernando B. Dias, Valery N. Kozhevnikov
Summary: This study discovers a new luminescence mechanism called thermally activated delayed fluorescence (TADF) in iridium(III) complexes. By incorporating a faster fluorescent radiative decay pathway, the design of iridium(III) complexes can be improved in terms of luminescence efficiency and performance.
Article
Nanoscience & Nanotechnology
Ru He, Zhengtao Xu, Silvano Valandro, Hadi D. Arman, Jiangeng Xue, Kirk S. Schanze
Summary: Two new platinum(II) compounds exhibit sharp blue-green or saturated deep-blue phosphorescence with high color purity. The compounds show a distinct 0-0 band dominant in their photoluminescence, with weaker vibronic progressions. When used as emitters in OLEDs, the compounds can achieve electroluminescence that closely matches their photoluminescence.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Nanoscience & Nanotechnology
Young Hun Jung, Durai Karthik, Hyuna Lee, Jee Hyun Maeng, Ki Joon Yang, Soonjae Hwang, Jang Hyuk Kwon
Summary: A red fluorescent material, 1,3,7,9-tetrakis(4-(tert-butyl)-phenyl)-5,5-difluoro-10-(2-methoxyphenyl)-5H-4l4,5l4-dipyrrolo[1,2-c:2',1'-f][1,3,2]diazaborinine (4tBuMB), was utilized as an emitting dopant in a thermally activated delayed fluorescence (TADF) sensitized hyperfluorescence organic light-emitting diode (HFOLED), demonstrating high photoluminescence quantum yield and device stability. The performance of the HFOLED device with 4tBuMB and 4CzTPN as the sensitizing host outperformed that with 4CzIPN, attributed to higher Forster resonance energy transfer rate and improved device lifetime.
ACS APPLIED MATERIALS & INTERFACES
(2021)
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
Materials Science, Multidisciplinary
Hea Jung Park, Jae-Ho Jang, Ha Lim Lee, Jun Yeob Lee, Do-Hoon Hwang
Summary: Pt-Pytz is a blue phosphorescent Pt (II) complex with high quantum efficiency and excellent electroluminescent properties. In the solid state, Pt-Pytz suppresses molecular aggregation. When used as a blue dopant in organic light-emitting diodes, it exhibits good performance with high external quantum efficiency.
ORGANIC ELECTRONICS
(2021)
Article
Chemistry, Physical
Makarii I. Kozlov, Kirill M. Kuznetsov, Alexander S. Goloveshkin, Andrei Burlakin, Maria Sandzhieva, Sergey V. Makarov, Elena Ilina, Valentina V. Utochnikova
Summary: An approach to increase the efficiency of europium-based OLEDs was proposed through the formation of a mixed-ligand complex. By designing a series of europium complexes and optimizing the solution deposition process, including host selection and variation of solvent and deposition parameters, the luminance of the OLEDs was significantly increased. The maximum luminance of the Eu-based OLED reached up to 700 cd/m(2), which is one of the highest values for a solution-processed Eu-based OLED. Finally, the stability of the OLED was investigated.
Article
Chemistry, Multidisciplinary
Alexander C. Brannan, Hwan-Hee Cho, Antti-Pekka M. Reponen, Mikko Linnolahti, Manfred Bochmann, Neil C. Greenham, Alexander S. Romanov
Summary: A series of carbene-gold-acetylide complexes have been synthesized and found to exhibit deep-blue to blue-green phosphorescence in various media. The increase of carbene-gold moieties in these complexes leads to higher extinction coefficients and stronger oscillator strength coefficients in the UV-vis spectra.
ADVANCED MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Ho Jin Jang, Cho Rong Kim, Jun Yeob Lee
Summary: By engineering the host of the emitter, the emission color of OLEDs can be managed, selectively switching the phosphorescence emission process, and ultimately tuning the color coordinates of OLEDs.
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
(2021)
Article
Nanoscience & Nanotechnology
Qi Ai, Jingshan Chai, Weiwei Lou, Tiangeng Liu, Dan Wang, Chao Deng, Chao Wang, Guijie Li, Xiaogang Liu, Zugang Liu, Qisheng Zhang
ACS APPLIED MATERIALS & INTERFACES
(2020)
Article
Chemistry, Physical
Guijie Li, Xiangdong Zhao, Tyler Fleetham, Qidong Chen, Feng Zhan, Jianbing Zheng, Yun-Fang Yang, Weiwei Lou, Yuning Yang, Kun Fang, Zongzhou Shao, Qisheng Zhang, Yuanbin She
CHEMISTRY OF MATERIALS
(2020)
Article
Physics, Applied
Guijie Li, Lydia Ameri, Tyler Fleetham, Zhi-Qiang Zhu, Jian Li
APPLIED PHYSICS LETTERS
(2020)
Article
Chemistry, Inorganic & Nuclear
Guijie Li, Gang Shen, Xiaoli Fang, Yun-Fang Yang, Feng Zhan, Jianbing Zheng, Weiwei Lou, Qisheng Zhang, Yuanbin She
INORGANIC CHEMISTRY
(2020)
Article
Chemistry, Inorganic & Nuclear
Guijie Li, Jianbing Zheng, Xiaoli Fang, Kewei Xu, Yun-Fang Yang, Jiang Wu, Linyu Cao, Jian Li, Yuanbin She
Summary: A series of N-heterocyclic carbene-based tetradentate Pd(II) complexes were designed and synthesized, which exhibited stability and high thermal decomposition temperature. The electrochemical and photophysical properties of these complexes were systematically investigated through experimental research and theoretical calculation.
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
Materials Science, Multidisciplinary
Haonan Wang, Cong Cheng, Dan Wang, Weiwei Lou, Yunhui Zhu, Chao Deng, Guijie Li, Qisheng Zhang
Summary: A deep blue TADF molecule was prepared using a small EEST pyridine-phenol fluoroboron complex as the acceptor, maintaining a small EEST by attaching carbazole donors to the phenyl rings. The compound exhibited a high fluorescence rate and small D-A dihedral angle change in the excited state, leading to nearly 100% PL quantum yield and a narrow PL spectrum. A TADF-sensitized fluorescence device containing this molecule achieved a high external quantum efficiency and improved color coordinates compared to a control device.
ORGANIC ELECTRONICS
(2021)
Article
Chemistry, Multidisciplinary
Guijie Li, Hua Guo, Xiaoli Fang, Yun-Fang Yang, Yulu Sun, Weiwei Lou, Qisheng Zhang, Yuanbin She
Summary: A series of tetradentate Pd(II) and Pt(II) complexes containing fused 5/6/6 metallocycles with phenyl N-heteroaromatic benzo[d]imidazole (pbiz), benzo[d]oxazole (pboz), or benzo[d]thiazole (pbthz)-containing ligands were developed. Experimental and theoretical studies showed that both the central metal and benzannulated N-heteroaromatic ring significantly influence the electrochemical, photophysical, and excited-state properties of the complexes. Compared to pbiz-based complexes, those with pboz and pbthz-containing ligands exhibited significant red-shift emission spectra.
CHINESE JOURNAL OF CHEMISTRY
(2022)
Article
Materials Science, Multidisciplinary
Guijie Li, Shun Liu, Yulu Sun, Weiwei Lou, Yun-Fang Yang, Yuanbin She
Summary: OLED is a promising technology for high-end electronics displays, with Pt(ii) complexes playing a key role in OLED fabrication. A novel series of Pt(ii) complexes with N-heterocyclic carbenes have been designed and developed, showing excellent emission properties in OLED applications, such as a high L-max of 64,416 cd m(-2) and a peak EQE of 13.1%.
JOURNAL OF MATERIALS CHEMISTRY C
(2021)
Article
Chemistry, Inorganic & Nuclear
Guijie Li, Jianfeng Wen, Feng Zhan, Weiwei Lou, Yun-Fang Yang, Ying Hu, Yuanbin She
Summary: Pt(II) complexes are promising materials for OLED applications in various fields. A series of novel Pt(II) emitters based on biphenyl (bp) were designed and their properties were studied. Ligand modification and linking group control could effectively regulate their properties, while the emission spectra remained constant. The emitters exhibited vibronically featured spectra and achieved high photoluminescent quantum yields. Green OLED using Pt(bp-12) achieved a maximum brightness of 16,644 cd/m(2).
INORGANIC CHEMISTRY
(2022)
Article
Chemistry, Organic
Yunfei Ge, Xingxing Su, Guijie Li, Yun-Fang Yang, Yuanbin She
Summary: An oxidative functionalization of naphthalene and its derivatives catalyzed by fluorine-containing porphyrin Mn(TFPP)Cl or non-fluorine-containing porphyrin Mn(TPP)Cl is reported, showing that the catalysts play a significant role in the reactions. These studies will provide valuable guidance for the development of metalloporphyrin-catalyzed C-H bond oxidative functionalization.
TETRAHEDRON LETTERS
(2023)
Article
Chemistry, Inorganic & Nuclear
Yulu Sun, Feng Zhan, Disheng Huang, Xia Wang, Lijie Dou, Kewei Xu, Yun-Fang Yang, Guijie Li, Yuanbin She
Summary: A series of novel tetradentate 6/6/6 Pt(II) complexes containing an 8-phenylquinoline-benzo[d]imidazole-carbazole ligand were synthesized; their large π-conjugation allowed them to exhibit high quantum efficiencies (1.2-1.5%) in dichloromethane at room temperature. Experimental and theoretical studies showed that modification of the quinoline moieties of the Pt(II) complexes could tune their electrochemical, photophysical, and excited-state properties. This work provides valuable reference for the design and development of monomer NIR emitters.
INORGANIC CHEMISTRY
(2023)
Article
Multidisciplinary Sciences
Guijie Li, Kewei Xu, Jianbing Zheng, Xiaoli Fang, Yun-Fang Yang, Weiwei Lou, Qingshan Chu, Jianxin Dai, Qidong Chen, Yuning Yang, Yuan-Bin She
Summary: An efficient one-pot strategy for the synthesis of double boron-oxygen-fused polycyclic aromatic hydrocarbons (dBO-PAHs) with high regioselectivity and efficient skeletal editing is developed. These compounds show low aromaticity, but high chemical and thermal stabilities. They can exhibit ultralong afterglow and be used as n-type host materials in high-brightness and high-efficiency deep-blue OLEDs, leading to significant enhancements in brightness and efficiency.
NATURE COMMUNICATIONS
(2023)
Article
Materials Science, Multidisciplinary
Cong Cheng, Yongshi Jiang, Haonan Wang, Weiwei Lou, Yunhui Zhu, Chao Deng, Dan Wang, Taiju Tsuboi, Guijie Li, Qisheng Zhang
Summary: A novel blue TADF emitter with high fluorescence rate and stability is reported, showing a narrow emission bandwidth. High external quantum efficiencies are achieved in OLEDs containing these emitters.
JOURNAL OF MATERIALS CHEMISTRY C
(2021)
Article
Chemistry, Organic
Xiahe Chen, Qunmin Wang, Haimin Shen, Guijie Li, Yun-Fang Yang, Yuan-Bin She
ORGANIC & BIOMOLECULAR CHEMISTRY
(2020)
Article
Materials Science, Multidisciplinary
Jinfei Dai, Chenjing Zhao, Jie Xu, Hossein Roshan, Hua Dong, Francesco Di Stasio, Fang Yuan, Bo Jiao, Zhaoxin Wu
Summary: In this study, the performance of perovskite nanocrystal light emitting diodes (PNC-LEDs) was enhanced through rational device structure design and the application of high-performance perovskite nanocrystal emitting layers.
ORGANIC ELECTRONICS
(2024)
Article
Materials Science, Multidisciplinary
Jia-Hua Yeh, Suhendro Purbo Prakoso, Leon Lukhas Santoso, Shi-Ju Chen, Bryan Chiang, Ju-Chieh Cheng, Ru-Ning Zhang, Yu-Cheng Chiu
Summary: This study demonstrates the application of a renewable material called dextrin-SMS in the production of electret filters and transistor memory. Dextrin-SMS material can maintain prolonged electrostatic charges and has a relatively wide memory window, making it suitable for the production of biodegradable face masks and green electronics.
ORGANIC ELECTRONICS
(2024)
Article
Materials Science, Multidisciplinary
Ahmad Telfah, Qais M. Al-Bataineh, Ahmad A. Ahmad, Rund Abu-Zurayk, Carlos J. Tavares, Johannes Etzkorn, Farzad Foadian
Summary: Polyacrylic acid complexed with polyaniline (PAA/PANI) composite materials have the potential to form organic mixed ion-electron conductive (OMIEC) films, which can be used in optoelectronic and energy storage applications. The composite films are formed through an acid-base reaction, resulting in strong electrostatic interactions and intermolecular hydrogen bonds between PANI and PAA. The separation of PANI-rich domains from PAA-rich matrix in the composite films is observed. The electrical conductivity of the composite films is higher when the content of PANI is 33 wt%, due to the high ionic-electronic coupling at the interface between phase-separated regions.
ORGANIC ELECTRONICS
(2024)
Article
Materials Science, Multidisciplinary
Min-Chih Hou, Dian Luo, Yu-Ting Huang, Shun-Wei Liu, Chin-Wei Lu, Chih-Hao Chang, Hai-Ching Su
Summary: Light-emitting electrochemical cells (LECs) have great potential for novel emission applications, but their relatively low device efficiency hinders their competitiveness with other emission technologies. A study finds that increasing the concentration of small TiO2 nano-particles in the diffuser film can enhance light extraction and improve the device efficiency of LECs.
ORGANIC ELECTRONICS
(2024)
Article
Materials Science, Multidisciplinary
Qiaoli Niu, Yao Xu, Jun Yang, Wei Hua, Baoxiang Chai, Zequan Zhang, Yuhui Ma, Wenjin Zeng, Ana Flavia Nogueira, Ruidong Xia
Summary: By introducing CPB as a defect passivation agent in the perovskite precursor solution, the optoelectronic properties of perovskite films can be significantly improved and non-radiative carrier recombination can be effectively suppressed. CPB-modified perovskite solar cells exhibit lower trap-state density and stronger carrier migration capability, leading to enhanced power conversion efficiency and stability.
ORGANIC ELECTRONICS
(2024)
Article
Materials Science, Multidisciplinary
Hulya Ozturk Dogan, Fatma Yildirim, Zeynep Orhan, Ali Ben Ahmed, Mostefa Benhaliliba, Sakir Aydogan
Summary: In this study, efficient self-powered visible and UV photodetectors based on hybrid organic-inorganic materials were demonstrated. The photodetectors showed excellent UV detecting capability and good photoresponsivity.
ORGANIC ELECTRONICS
(2024)
