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Issue 8, 2015
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Luminescent zinc(II) and copper(I) complexes for high-performance solution-processed monochromic and white organic light-emitting devices

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Abstract

The synthesis and spectroscopic properties of luminescent tetranuclear zinc(II) complexes of substituted 7-azaindoles and a series of luminescent copper(I) complexes containing 7,8-bis(diphenylphosphino)-7,8-dicarba-nido-undecaborate ligand are described. These complexes are stable towards air and moisture. Thin film samples of the luminescent copper(I) complexes in 2,6-dicarbazolo-1,5-pyridine and zinc(II) complexes in poly(methyl methacrylate) showed emission quantum yields of up to 0.60 (for Cu-3) and 0.96 (for Zn-1), respectively. Their photophysical properties were examined by ultrafast time-resolved emission spectroscopy, temperature dependent emission lifetime measurements and density functional theory calculations. Monochromic blue and orange solution-processed OLEDs with these Zn(II) and Cu(I) complexes as light-emitting dopants have been fabricated, respectively. Maximum external quantum efficiency (EQE) of 5.55% and Commission Internationale de l'Eclairage (CIE) coordinates of (0.16, 0.19) were accomplished with the optimized Zn-1-OLED while these values were, respectively 15.64% and (0.48, 0.51) for the optimized Cu-3-OLED. Solution-processed white OLEDs having maximum EQE of 6.88%, CIE coordinates of (0.42, 0.44), and colour rendering index of 81 were fabricated by using these luminescent Zn(II) and Cu(I) complexes as blue and orange light-emitting dopant materials, respectively.

Graphical abstract: Luminescent zinc(ii) and copper(i) complexes for high-performance solution-processed monochromic and white organic light-emitting devices

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Publication details

The article was received on 15 Oct 2014, accepted on 15 May 2015 and first published on 02 Jun 2015


Article type: Edge Article
DOI: 10.1039/C4SC03161J
Citation: Chem. Sci., 2015,6, 4623-4635
  • Open access: Creative Commons BY license
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    Luminescent zinc(II) and copper(I) complexes for high-performance solution-processed monochromic and white organic light-emitting devices

    G. Cheng, G. K. So, W. To, Y. Chen, C. Kwok, C. Ma, X. Guan, X. Chang, W. Kwok and C. Che, Chem. Sci., 2015, 6, 4623
    DOI: 10.1039/C4SC03161J

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