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Mao MX, Li FL, Shen Y, Liu QM, Xing S, Luo XF, Tu ZL, Wu XJ, Zheng YX. Simple Synthesis of Red Iridium(III) Complexes with Sulfur-Contained Four-Membered Ancillary Ligands for OLEDs. Molecules 2021; 26:molecules26092599. [PMID: 33946904 PMCID: PMC8125720 DOI: 10.3390/molecules26092599] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2021] [Revised: 04/24/2021] [Accepted: 04/27/2021] [Indexed: 11/16/2022] Open
Abstract
Phosphorescent iridium(III) complexes have been widely researched for the fabrication of efficient organic light-emitting diodes (OLEDs). In this work, three red Ir(III) complexes named Ir-1, Ir-2, and Ir-3, with Ir-S-C-S four-membered framework rings, were synthesized efficiently at room temperature within 5 min using sulfur-containing ancillary ligands with electron-donating groups of 9,10-dihydro-9,9-dimethylacridine, phenoxazine, and phenothiazine, respectively. Due to the same main ligand of 4-(4-(trifluoromethyl)phenyl)quinazoline, all Ir(III) complexes showed similar photoluminescence emissions at 622, 619, and 622 nm with phosphorescence quantum yields of 35.4%, 50.4%, and 52.8%, respectively. OLEDs employing these complexes as emitters with the structure of ITO (indium tin oxide)/HAT-CN (dipyra-zino[2,3-f,2',3'-h]quinoxaline-2,3,6,7,10,11-hexacarbonitrile, 5 nm)/TAPC (4,4'-cyclohexylidenebis[N,N-bis-(4-methylphenyl)aniline], 40 nm)/TCTA (4,4″,4″-tris(carbazol-9-yl)triphenylamine, 10 nm)/Ir(III) complex (10 wt%): 2,6DCzPPy (2,6-bis-(3-(carbazol-9-yl)phenyl)pyridine, 10 nm)/TmPyPB (1,3,5-tri(mpyrid-3-yl-phenyl)benzene, 50 nm)/LiF (1 nm)/Al (100 nm) achieved good performance. In particular, the device based on complex Ir-3 with the phenothiazine unit showed the best performance with a maximum brightness of 22,480 cd m-2, a maximum current efficiency of 23.71 cd A-1, and a maximum external quantum efficiency of 18.1%. The research results suggest the Ir(III) complexes with a four-membered ring Ir-S-C-S backbone provide ideas for the rapid preparation of Ir(III) complexes for OLEDs.
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Affiliation(s)
- Meng-Xi Mao
- State Key Laboratory of Coordination Chemistry, Collaborative Innovation Center of Advanced Microstructures, Jiangsu Key Laboratory of Advanced Organic Materials, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210023, China; (M.-X.M.); (F.-L.L.); (Y.S.); (Q.-M.L.); (S.X.); (X.-F.L.); (Z.-L.T.); (X.-J.W.)
| | - Fang-Ling Li
- State Key Laboratory of Coordination Chemistry, Collaborative Innovation Center of Advanced Microstructures, Jiangsu Key Laboratory of Advanced Organic Materials, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210023, China; (M.-X.M.); (F.-L.L.); (Y.S.); (Q.-M.L.); (S.X.); (X.-F.L.); (Z.-L.T.); (X.-J.W.)
| | - Yan Shen
- State Key Laboratory of Coordination Chemistry, Collaborative Innovation Center of Advanced Microstructures, Jiangsu Key Laboratory of Advanced Organic Materials, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210023, China; (M.-X.M.); (F.-L.L.); (Y.S.); (Q.-M.L.); (S.X.); (X.-F.L.); (Z.-L.T.); (X.-J.W.)
| | - Qi-Ming Liu
- State Key Laboratory of Coordination Chemistry, Collaborative Innovation Center of Advanced Microstructures, Jiangsu Key Laboratory of Advanced Organic Materials, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210023, China; (M.-X.M.); (F.-L.L.); (Y.S.); (Q.-M.L.); (S.X.); (X.-F.L.); (Z.-L.T.); (X.-J.W.)
| | - Shuai Xing
- State Key Laboratory of Coordination Chemistry, Collaborative Innovation Center of Advanced Microstructures, Jiangsu Key Laboratory of Advanced Organic Materials, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210023, China; (M.-X.M.); (F.-L.L.); (Y.S.); (Q.-M.L.); (S.X.); (X.-F.L.); (Z.-L.T.); (X.-J.W.)
| | - Xu-Feng Luo
- State Key Laboratory of Coordination Chemistry, Collaborative Innovation Center of Advanced Microstructures, Jiangsu Key Laboratory of Advanced Organic Materials, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210023, China; (M.-X.M.); (F.-L.L.); (Y.S.); (Q.-M.L.); (S.X.); (X.-F.L.); (Z.-L.T.); (X.-J.W.)
| | - Zhen-Long Tu
- State Key Laboratory of Coordination Chemistry, Collaborative Innovation Center of Advanced Microstructures, Jiangsu Key Laboratory of Advanced Organic Materials, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210023, China; (M.-X.M.); (F.-L.L.); (Y.S.); (Q.-M.L.); (S.X.); (X.-F.L.); (Z.-L.T.); (X.-J.W.)
| | - Xue-Jun Wu
- State Key Laboratory of Coordination Chemistry, Collaborative Innovation Center of Advanced Microstructures, Jiangsu Key Laboratory of Advanced Organic Materials, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210023, China; (M.-X.M.); (F.-L.L.); (Y.S.); (Q.-M.L.); (S.X.); (X.-F.L.); (Z.-L.T.); (X.-J.W.)
| | - You-Xuan Zheng
- State Key Laboratory of Coordination Chemistry, Collaborative Innovation Center of Advanced Microstructures, Jiangsu Key Laboratory of Advanced Organic Materials, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210023, China; (M.-X.M.); (F.-L.L.); (Y.S.); (Q.-M.L.); (S.X.); (X.-F.L.); (Z.-L.T.); (X.-J.W.)
- Green Catalysis Center and College of Chemistry, Zhengzhou University, Zhengzhou 450001, China
- Correspondence:
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Affiliation(s)
- Barbora Balónová
- Department of Chemistry, University of New Brunswick, Fredericton, New Brunswick, Canada
| | | | | | - Barry A Blight
- Department of Chemistry, University of New Brunswick, Fredericton, New Brunswick, Canada
- School of Physical Sciences, University of Kent, Canterbury, UK
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