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![[DPEPhosbcpCu]PF6: A General and Broadly Applicable Copper-Based Photoredox Catalyst](/_next/image?url=https%3A%2F%2Fcloudfront.jove.com%2FCDNSource%2Fteasers%2F59739.jpg&w=3840&q=50)
[DPEPhosbcpCu]PF6: A General and Broadly Applicable Copper-Based Photoredox Catalyst
Published on: May 21, 2019
Heteroleptic mononuclear Cu(I) halide complexes containing carbazolyl substituted phenyl diphosphine and
Zhun Chen1, Wei Xu1, Ruiqin Zhu2
1College of Chemistry and Chemical Engineering, Ministry of Education Key Laboratory for the Synthesis and Application of Organic Functional Molecules, Hubei University, Wuhan 430062, P. R. China. liulihubei@hubu.edu.cn.
Abstract:
How to obtain heteroleptic mononuclear Cu(I) halide complexes with high quantum efficiency and short decay lifetime remains a challenge. Here, seven mononuclear four-coordinate Cu(I) halide complexes [CuX(DCzDP)(PPh3)] (DCzDP = 1,2-bis(9-carbazolyl)-4,5-bis(diphenylphosphino)benzene, X = Br (1), Cl (2)), [CuX(DCzDP)(CzP)] (CzP = 9-methyl-3-(diphenylphosphino)carbazole, X = I (3), Br (4), Cl (5)) and [CuX(DCzDP)(DCzP)] (DCzP = bis(9-methyl-3-carbazolyl)phenylphosphine, X = I (6), Br (7)), were synthesized and their structures and photophysical properties were characterized. At room temperature, complexes 1-7 in the powder state emit a yellowish green to yellow green delayed fluorescence (λem = 531-560 nm, Φ = 0.34-0.75, τ = 1.8-2.9 μs). By replacing one phenyl group of PPh3 with a 9-methyl-3-carbazolyl group, the PLQYs (photoluminescence quantum yields) of the complexes are effectively improved and the decay lifetimes are only around 2.0 μs. Among them, complex 4 displays the highest PLQY (0.75) and a short decay lifetime (1.9 μs). The radiative decay rate (kr) is 3.95 × 105 s-1, which is the highest value among the reported heteroleptic mononuclear Cu(I) halide complexes and comparable with that of Ir(III) complexes. Solution-processed organic light-emitting devices that contain complex 4 exhibit greenish yellow fluorescence with a maximum external quantum efficiency (EQE) of 6.56% and a maximum luminance of 3364 cd m-2.
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