TY - JOUR
T1 - New pyridylimidazole-based near-infrared iridophosphors
T2 - Synthesis, photophysical properties, and electroluminescence application
AU - Qu, Wenshan
AU - Wang, Guoliang
AU - Gao, Zhixiang
AU - Miao, Yanqin
AU - Jiang, Jiayang
AU - Tao, Peng
AU - Pang, Yudong
AU - Wei, Bin
N1 - Funding Information:
The authors acknowledge the National Natural Science Foundation of China ( 61905120 ), China Postdoctoral Science Foundation Funded Project ( 2018M640506 ), Shanxi Province Science and Technology Key Project ( 201703D121037-2 ), Shanxi Province Universities Science and Technology Achievements Transformation and Cultivation Project (No. 31 ), Key R&D program of Shanxi Province ( International Cooperation , 201903D421087 ), Program for the Innovative Talents of Higher Education Institutions of Shanxi, the 2020 General Projects of Natural Science Research in Colleges and Universities of Jiangsu Province ( 20KJB150048 ), the Starting Research Fund of Nanjing Vocational University of Industry Technology ( YK20-14-02 ) for financial support.
Publisher Copyright:
© 2022 Elsevier Ltd
PY - 2022/9/10
Y1 - 2022/9/10
N2 - A pair of highly efficient near-infrared (NIR) phosphorescent iridium(III) complexes (NIR-Ir1 and NIR-Ir2) based on pyridylimidazole derivatives are rationally designed. 1-(Benzo [b]thiophen-2-yl)isoquinoline is selected as the cyclomedtalating ligand for complexes, which determines the near-infrared phosphorescence. 2-(1H-imidazole-2-yl)pyridine and 2-(pyridin-2-yl)-1H-benzo[d]imidazole serve as the ancillary ligands, which aims to finely adjust the photophysical properties of these two NIR iridophosphors. At room temperature, both complexes exhibit intense near-infrared phosphorescence and the emission spectra well overlap with each other (685 nm with 750 nm as the emission shoulder for NIR-Ir1 and NIR-Ir2), high photoluminescence quantum yield (0.10 for NIR-Ir1, 0.13 for NIR-Ir2) in dichloromethane. The pyridylimidazole-type ancillary ligands incorporated into the complexes enable the effective NIR phosphorescence and the robust chemical stability for NIR organic light-emitting diodes (OLEDs). The preliminary results show that the maximum luminescence and external quantum efficiency for the OLEDs based on new NIR complexes with electroluminescence peaked at around 690 nm are 1,464 cd/m2 and 1.48%, respectively.
AB - A pair of highly efficient near-infrared (NIR) phosphorescent iridium(III) complexes (NIR-Ir1 and NIR-Ir2) based on pyridylimidazole derivatives are rationally designed. 1-(Benzo [b]thiophen-2-yl)isoquinoline is selected as the cyclomedtalating ligand for complexes, which determines the near-infrared phosphorescence. 2-(1H-imidazole-2-yl)pyridine and 2-(pyridin-2-yl)-1H-benzo[d]imidazole serve as the ancillary ligands, which aims to finely adjust the photophysical properties of these two NIR iridophosphors. At room temperature, both complexes exhibit intense near-infrared phosphorescence and the emission spectra well overlap with each other (685 nm with 750 nm as the emission shoulder for NIR-Ir1 and NIR-Ir2), high photoluminescence quantum yield (0.10 for NIR-Ir1, 0.13 for NIR-Ir2) in dichloromethane. The pyridylimidazole-type ancillary ligands incorporated into the complexes enable the effective NIR phosphorescence and the robust chemical stability for NIR organic light-emitting diodes (OLEDs). The preliminary results show that the maximum luminescence and external quantum efficiency for the OLEDs based on new NIR complexes with electroluminescence peaked at around 690 nm are 1,464 cd/m2 and 1.48%, respectively.
KW - 1H-imidazole
KW - Iridium(III) complex
KW - Near-infrared phosphorescence
KW - Organic light-emitting diode
UR - http://www.scopus.com/inward/record.url?scp=85135581978&partnerID=8YFLogxK
U2 - 10.1016/j.tet.2022.132938
DO - 10.1016/j.tet.2022.132938
M3 - Journal article
AN - SCOPUS:85135581978
SN - 0040-4020
VL - 122
JO - Tetrahedron
JF - Tetrahedron
M1 - 132938
ER -