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
Nanoscience & Nanotechnology
Sidney A. Howell, Manikandan Koodalingam, Junhyuk Jang, Chandana Sampath Kumara Ranasinghe, Mile Gao, Ronan Chu, Mohammad Babazadeh, David M. Huang, Paul L. Burn, Paul E. Shaw, Emma V. Puttock
Summary: The authors synthesized a family of first-generation dendrimers with 3,5-bis(carbazolyl)-phenyl dendrons attached to a green emissive fac-tris(2-phenylpyridyl)iridium(III) core. The dendrimers' solubility was increased by adding tert-butyl surface groups to the carbazole moieties. The density of the films containing doubly dendronized materials was higher than those containing mono-dendronized counterparts, with the highest density at 1.12 +/- 0.04 g cm-3 for the dendrimer with two rotationally constrained dendrons per ligand. The dendrimers also showed high photoluminescence quantum yields (PLQYs) in solution and were incorporated into solution-processed OLEDs with high external quantum efficiencies.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Materials Science, Multidisciplinary
Sejeong Um, Unhyeok Jo, Jun Yeob Lee
Summary: Two novel electron transporting materials (ETMs), DPTrz-ICz and 2DPTrz-ICz, were developed based on the ICz core combined with DPTrz. These ETMs exhibited enhanced intermolecular charge transport properties and high triplet energy, leading to improved efficiency in green phosphorescent organic light-emitting diodes.
SCIENCE CHINA-MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Xiaolong Yang, Shipan Xu, Yan Zhang, Chengyun Zhu, Linsong Cui, Guijiang Zhou, Zhao Chen, Yuanhui Sun
Summary: This study reports two NIR phosphorescent Ir(III) complexes with emission peaks around 730 nm and narrow full width at half maximum of only 43 nm. Pure NIR luminescence can be obtained without a very long emission wavelength, thus overcoming the restriction of the energy gap law and achieving impressively high photoluminescence quantum yield up to 0.70. Moreover, pure NIR organic light-emitting diodes (OLEDs) fabricated by solution-processing method show outstanding device performance with the highest external quantum efficiency of 16.43%, setting a new record for solution-processed NIR-OLEDs based on different emitters.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Materials Science, Multidisciplinary
Chao Tang, Jianmei Chen, Zhenghua Zhu, Changdong Shao, Yong Wang, Youhua Chen, Zijie Zhu, Mingxuan Shi, Yue Jin, Hui Yang, Jiujuan Fu, Yuxin Han, Jiayi Hu, Fangfang Wang, Jia Hu, Xudong Cao, Yuhe Kan, Lili Zhang
Summary: Two carbazole or carbazole-3-carbonitrile/pyridine-based bipolar materials were synthesized as hosts for solution-processed sky-blue PhOLEDs and green TADF-OLEDs. Increasing the doping concentration from 10% to 15% slightly reduced the turn-on voltage of the devices based on 2,6-CzPy. Introduction of cyano substituents improved the thermal stability of the hosts, but also resulted in deeper HOMO levels and larger hole injection barriers in CN-2,6-CzPy, which did not contribute to enhanced device performance.
Review
Chemistry, Multidisciplinary
Sungwon Yoon, Thomas S. Teets
Summary: This article discusses advances in the design of molecular phosphors that phosphoresce in the red to near-infrared regions, focusing on cyclometalated iridium complexes. The introduction of electron-rich, nitrogen-containing ancillary ligands has allowed for record-breaking phosphorescence quantum yields. The study covers insights gained on the relationships between molecular structure, frontier orbital energies, and excited-state dynamics across three distinct regions of the spectrum.
CHEMICAL COMMUNICATIONS
(2021)
Article
Polymer Science
Zong-Liang Tseng, Wei-Lun Huang, Tzu-Hung Yeh, You-Xun Xu, Chih-Hsun Chiang
Summary: Through a simple combination of commercial materials, excellent TADF properties and high-efficiency exciplex OLEDs with low turn-on voltage and high luminance can be achieved.
Article
Chemistry, Multidisciplinary
Zhao Chen, Xiao-Wen Deng, Xiao-Yan Wang, An-Qi Wang, Wen-Tao Luo
Summary: A series of carbazole-containing gold(I) complexes with different substituents were designed and synthesized, showing aggregation-induced phosphorescent emission phenomena and reversible mechanoluminochromic properties in some cases.
FRONTIERS IN CHEMISTRY
(2022)
Article
Chemistry, Multidisciplinary
Tianqi Xu, Peng Wu, Lingyun Lou, Yuzhan Li, Dong Wang, Hui Cao, Wanli He, Zhou Yang
Summary: This paper presents a study on organic room-temperature phosphorescent (RTP) materials, successfully designing two phosphorescent molecules and incorporating them into a dynamic epoxy crosslinking network to achieve high quantum yields and long phosphorescent lifetimes in pure organic RTP vitrimers. The research demonstrates the potential phosphorescent properties of the molecules and highlights the role of the vitrimer's rigid cross-linked network in phosphorescent emission. Additionally, the study shows the ability to tailor the phosphorescence lifetime of the RTP vitrimers for anti-counterfeiting applications, offering a new strategy for the design of pure organic RTP materials.
NEW JOURNAL OF CHEMISTRY
(2021)
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, 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, Applied
Baeksang Sung, Seonjeong Lee, Chul Woong Joo, Dasol Kim, Jonghee Lee, Yun-Hi Kim
Summary: A novel thermally stable host material, Si-IDCz, has been reported for blue phosphorescent organic light-emitting diodes. Si-IDCz exhibits a high glass transition temperature and a rigid silicon core, which contribute to its high performance and stability.
Article
Chemistry, Physical
Pengfei Yu, Yin Xiao
Summary: In this study, four bipolar blue-emitting materials were designed and synthesized, with carbazole, imidazole, and biphenyl as donor, acceptor, and p bridge, respectively. The incorporation of twisted phenylimidazole acceptor and appropriate substituents on the carbazole donor led to the successful development of a high-performance deep-blue OLED.
Article
Chemistry, Multidisciplinary
Guang Hu, Stuart P. Kitney, Muralidhar Reddy Billa, Stephen M. Kelly, Brian Lambert, William Harrison
Summary: Two structural isomers of alkyl-substituted tri-carbazoles were synthesized to investigate the impact of substitution pattern on their liquid crystalline behavior, conductivity, and performance in OLEDs. The isomer with a 2,7-disubstitution pattern exhibited high conductivity and efficiency in OLEDs, while the isomer with a 3,6-substitution pattern showed lower conductivity and poor performance in OLEDs due to the lack of observable liquid crystalline behavior.
Article
Engineering, Electrical & Electronic
Khrystyna Ivaniuk, Pavlo Stakhira, Iryna Yaremchuk, Stepan Kutsiy, Tetiana Bulavinets, Dmytro Volyniuk, Ivan Klymenko, Galyna Sych, Nataliya Karaush-Karmazin, Amjad Ali, Aliaksei Vaitusionak, Sergei Kostjuk, Juozas Vidas Grazulevicius, Glib Baryshnikov
Summary: In this paper, a multifunctional molecule called 9-(2,3,5,6-tetrafluoro-4-vinylphenyl)carbazole (Cz4FS) is reported, which can be used as a fluorescent emitter, host material, acceptor part, and monomer in various organic light-emitting devices (OLEDs) applications. The molecule shows excellent performance in terms of efficiency and brightness, making it a promising candidate for different OLED applications.
ACS APPLIED ELECTRONIC MATERIALS
(2023)
Article
Nanoscience & Nanotechnology
Min-Soo Choi, Tae-Min Kim, Hyun-Sub Shim, Beom-Soo Kim, Hyo Jung Kim, Jang-Joo Kim
ACS APPLIED MATERIALS & INTERFACES
(2015)
Article
Physics, Applied
Hyun Hwi Lee, Jeong-Hwan Lee, Jang-Joo Kim, Hyo Jung Kim
APPLIED PHYSICS EXPRESS
(2015)
Article
Chemistry, Multidisciplinary
Jung-Bum Kim, Seung-Hoon Han, Kiyull Yang, Soon-Ki Kwon, Jang-Joo Kim, Yun-Hi Kim
CHEMICAL COMMUNICATIONS
(2015)
Article
Chemistry, Physical
Chang-Ki Moon, Kwon-Hyeon Kim, Jin Woo Lee, Jang-Joo Kim
CHEMISTRY OF MATERIALS
(2015)
Review
Polymer Science
Seung-Jun Yoo, Jang-Joo Kim
MACROMOLECULAR RAPID COMMUNICATIONS
(2015)
Article
Optics
Chang-Ki Moon, Sei-Yong Kim, Jeong-Hwan Lee, Jang-Joo Kim
Article
Materials Science, Multidisciplinary
Jung-Bum Kim, Jeong-Hwan Lee, Chang-Ki Moon, Kwon-Hyeon Kim, Jang-Joo Kim
ORGANIC ELECTRONICS
(2015)
Article
Materials Science, Multidisciplinary
Beom-Soo Kim, Tae-Min Kim, Min-Soo Choi, Hyun-Sub Shim, Jang-Joo Kim
ORGANIC ELECTRONICS
(2015)
Article
Chemistry, Physical
Hyun-Sub Shim, Francis Lin, Jihun Kim, Bomi Sim, Tae-Min Kim, Chang-Ki Moon, Chun-Kai Wang, Yongsok Seo, Ken-Tsung Wong, Jang-Joo Kim
ADVANCED ENERGY MATERIALS
(2015)
Article
Multidisciplinary Sciences
Sohee Jeon, Jeong-Hwan Lee, Jun-Ho Jeong, Young Seok Song, Chang-Ki Moon, Jang-Joo Kim, Jae Ryoun Youn
SCIENTIFIC REPORTS
(2015)
Article
Materials Science, Multidisciplinary
Kwon-Hyeon Kim, Chang-Ki Moon, Jin Won Sun, Bomi Sim, Jang-Joo Kim
ADVANCED OPTICAL MATERIALS
(2015)
Article
Materials Science, Multidisciplinary
Kwon-Hyeon Kim, Jae-Yeol Ma, Chang-Ki Moon, Jeong-Hwan Lee, Jang Yeol Baek, Yun-Hi Kim, Jang-Joo Kim
ADVANCED OPTICAL MATERIALS
(2015)
Article
Chemistry, Multidisciplinary
Chuan Liu, Junhyuk Jang, Yong Xu, Hyo-Jung Kim, Dongyoon Khim, Won-Tae Park, Yong-Young Noh, Jang-Joo Kim
ADVANCED FUNCTIONAL MATERIALS
(2015)
Article
Chemistry, Multidisciplinary
Jeong-Hwan Lee, Shuo-Hsien Cheng, Seung-Jun Yoo, Hyun Shin, Jung-Hung Chang, Chih-I Wu, Ken-Tsung Wong, Jang-Joo Kim
ADVANCED FUNCTIONAL MATERIALS
(2015)
Article
Materials Science, Multidisciplinary
Jeong-Hwan Lee, Ganguri Sarada, Chang-Ki Moon, Woosum Cho, Kwon-Hyeon Kim, Young Geun Park, Jin Yong Lee, Sung-Ho Jin, Jang-Joo Kim
ADVANCED OPTICAL MATERIALS
(2015)
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.