Article
Chemistry, Inorganic & Nuclear
Min Li, Li Wang, Caifa You, Denghui Liu, Kai Zhang, Weiguo Zhu
Summary: azaacenes have received extensive research attention for their potential in organic electronics. In this study, two new near-infrared emitting iridium complexes were designed and synthesized. By adjusting the structure of these complexes, the optoelectronic properties were optimized. The devices fabricated with these complexes exhibited excellent emission performance.
DALTON TRANSACTIONS
(2023)
Article
Chemistry, Multidisciplinary
Sangdong Kim, Jae-Min Kim, Jongwon Choi, Myungsun Sim, Yasushi Koishikawa, Yong-Suk Cho, Sungjun Kim, Seung-Yeon Kwak, Aram Jeon, Ohyun Kwon, Duck-Hyung Lee, Jun Yeob Lee, Byungki Choi
Summary: The horizontal orientation of the transition dipole moment plays a crucial role in improving the external quantum efficiency (EQE) of organic light-emitting diodes. In this study, red-emitting heteroleptic iridium (III) complexes with a high horizontal ratio of emitting dipole orientation (EDO) and photoluminescence quantum yield (PLQY) were reported, leading to enhanced device performance and longer operational lifetime. This approach opens up possibilities for further development of red-emitting iridium complexes to achieve higher device efficiencies.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Lok-Kwan Li, Cathay Chai Au-Yeung, Man-Chung Tang, Shiu-Lun Lai, Wai-Lung Cheung, Maggie Ng, Mei-Yee Chan, Vivian Wing-Wah Yam
Summary: A new class of yellow- to red-emitting carbazolylgold(iii) complexes with high photoluminescence quantum yields has been designed and synthesized, showing improved operational lifetimes in organic light-emitting devices. This work provides insights into the development of robust and highly luminescent gold(iii) complexes and stable molecular motifs for designing efficient emitters.
MATERIALS HORIZONS
(2022)
Article
Chemistry, Inorganic & Nuclear
Zheng-Yu Tao, Ze-Hui Pan, Ying-Jie Wang, Jialing Zhang, Qing-Song Wang, Qian-Feng Zhang, Bi-Hai Tong, Man-Keung Fung, Hui Kong
Summary: Successful synthesis of Ir(III) complexes with a triptycene skeleton resulted in improved fluorescence efficiency and thermal stability by eliminating intermolecular interactions, leading to the development of the most efficient OLED based on phthalazine iridium complexes.
INORGANIC CHEMISTRY FRONTIERS
(2022)
Article
Chemistry, Multidisciplinary
Cathay Chai Au-Yeung, Lok-Kwan Li, Man-Chung Tang, Shiu-Lun Lai, Wai-Lung Cheung, Maggie Ng, Mei-Yee Chan, Vivian Wing-Wah Yam
Summary: This study presents the design and synthesis of a new class of gold(III) complexes containing fused heterocyclic alkynyl ligands, which exhibit tunable emission colors and thermally activated delayed fluorescence properties. The complexes have high photoluminescence quantum yields and short excited-state lifetimes, making them suitable for organic light-emitting devices.
Article
Materials Science, Multidisciplinary
Chan Hee Ryu, Junseob Lim, Moon Bae Kim, Ji Hye Lee, Hyonseok Hwang, Jun Yeob Lee, Kang Mun Lee
Summary: This study presents the preparation and characterization of a phenyl-1,2,4-triazole-based iridium(III) complex, TzIr, which exhibits excellent blue-emission properties and thermal stability. When used as an emitter in OLEDs, TzIr shows outstanding performance with high external quantum efficiency and current efficiency, making it a promising candidate for developing efficient blue-phosphorescent emitters.
ADVANCED OPTICAL MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
Sohrab Nasiri, Manojkumar Dhanthala Thiyagarajan, Umamahesh Balijapalli, Malek Mahmoudi, Dmytro Volyniuk, Jurate Simokaitiene, Madhvesh Pathak, Sathiyanarayanan Kulathu Iyer, Juozas Vidas Grazulevicius
Summary: In this study, F or CF3 electron withdrawing groups were attached to the quinoline ligand, investigating their effect on the properties of iridium(III) complexes. The results showed that the CF3-substituted complexes exhibited slightly enhanced photophysical and electroluminescent properties, with higher external quantum efficiency in PhOLEDs compared to the F-containing complexes.
Article
Chemistry, Applied
Yan Bi, Shanyong Chen, He Zhao, Xiyan Zhang
Summary: A novel deep-red iridium complex with favorable physical properties and high-efficiency phosphorescent device performance is developed. It exhibits more excellent parameters compared to previous deep-red emitters and is currently rare in its comprehensive deep-red emission capabilities.
Article
Chemistry, Physical
Kengo Hara, Ami Morimoto, Kana Matsudaira, Satoko Suzuki, Shigeyuki Yagi, Michiya Fujiki, Yoshitane Imai
Summary: This work focuses on the development of external magnetic field driven, ambidextrous, circularly polarized electroluminescence devices. The use of racemic mixtures of phosphorescent organoiridium(III) emitters in the active emitting layer enables the chiroptical inversion of circularly polarized electroluminescence. The results demonstrate that the ligand environment and Faraday geometry have an influence on the chiroptical inversion of CPEL.
Article
Chemistry, Multidisciplinary
Wing-Kei Kwok, Lok-Kwan Li, Shiu-Lun Lai, Ming-Yi Leung, Wai Kit Tang, Shun-Cheung Cheng, Man-Chung Tang, Wai-Lung Cheung, Chi-Chiu Ko, Mei-Yee Chan, Vivian Wing-Wah Yam
Summary: A new class of gold(III) complexes containing acridinyl moieties and tetradentate C<^>C<^>N<^>N ligand has been designed and synthesized, which exhibit high photoluminescence quantum yields in solid-state thin films. These complexes have been utilized to fabricate high-performance OLEDs with high external quantum efficiencies and satisfactory operational half-lifetime values. The TADF properties of the complexes have been substantiated by various experimental techniques.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Article
Chemistry, Multidisciplinary
Shaoguang Wu, Youjia Wang, Yuling Zhao, Ruidong Wang, Ma Hailin, Tianzhi Yu
Summary: Two new green-emitting iridium(iii) complexes with styrene-modified phenylpyridine ligands were synthesized and characterized, showing green emission, suitable energy levels for HOMO and LUMO, and good thermal stability.
NEW JOURNAL OF CHEMISTRY
(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, Inorganic & Nuclear
Qin Zeng, Junjie Jiang, Weiqiao Zhou, Zihao Zhang, Yaohao Han, Song Guo, Yuanli Liu
Summary: Three transition-metal phosphorescent iridium(III) complexes were designed and synthesized, and the introduction of different amounts of methoxy could change the luminescence color. Among them, the device based on Ir2 achieved relatively high efficiency, indicating the potential of polymethoxy-based ionic Ir(III) complexes for the fabrication of red OLEDs with wet method.
JOURNAL OF ORGANOMETALLIC CHEMISTRY
(2023)
Article
Chemistry, Inorganic & Nuclear
Rashid Ilmi, Xiaofang Li, Nawal K. Al Rasbi, Liang Zhou, Wai-Yeung Wong, Paul R. Raithby, Muhammad S. Khan
Summary: Two new organo-europium complexes were synthesized and characterized, and they were used to fabricate red organic light emitting diodes. Exceptional device performance was achieved through device engineering optimization.
DALTON TRANSACTIONS
(2023)
Article
Chemistry, Inorganic & Nuclear
Rashid Ilmi, Xiaofang Li, Nawal K. Al Rasbi, Liang Zhou, Wai-Yeung Wong, Paul R. Raithby, Muhammad S. Khan
Summary: Two new organo-europium complexes have been successfully synthesized and characterized. These complexes exhibit strong red emissions in the solid state with high photoluminescence quantum yields. They were used as dopants in the emitting layer of red organic light emitting diodes, resulting in exceptional overall performance through device engineering.
DALTON TRANSACTIONS
(2023)
