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Wide Bite Angle Disphosphine Ligands in Thermally Activated Delayed Fluorescent Copper(I) Complexes: Impact on the Performance of Electroluminescence Applications

submitted on 17.02.2021, 15:13 and posted on 18.02.2021, 12:44 by Chenfei Li, Campbell Mackenzie, Said Said, Amlan Pal, Mohammad Haghighatbin, Azin Babaei, Michele Sessolo, David Cordes, Alexandra Slawin, Paul Kamer, Henk Bolink, Conor Hogan, Eli Zysman-Colman

We report a series of seven cationic heteroleptic copper(I) complexes of the form [Cu (P^P) (dmphen)]BF4, where dmphen is 2,9-dimethyl-1,10-phenanthroline and P^P is a diphosphine chelate, in which the effect of the bite angle of the diphosphine ligand on the photophysical properties of the complexes was studied. Several of the complexes exhibit moderately high photoluminescence quantum yields in the solid-state, with ΦPL of up to 35%, and in solution, with ΦPL of up to 98%. We were able to correlate the powder photoluminescence quantum yields with the %Vbur of the P^P ligand. The most emissive complexes were used to fabricate both organic light-emitting diodes (OLEDs) and light-emitting electrochemical calls (LECs), both of which showed moderate performance. Compared to the benchmark Cu(I)-based LECs, [Cu(dnbp)(DPEPhos)]+ (EQEmax = 16%), complex 3 (EQEmax = 1.85%) showed much longer device lifetime (t1/2 = 1.25 h and >16.5 h for [Cu(dnbp)(DPEPhos)]+ and complex 3, respectively). The electrochemiluminescent properties of several complexes were also studied which to the best of our knowledge constitutes the first ECL study for heteroleptic copper (I) complexes. Notably, complexes exhibiting more reversible electrochemistry were associated with higher annihilation ECL as well as better performance in an LEC device.


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Email Address of Submitting Author


University of St Andrews


United Kingdom

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Declaration of Conflict of Interest

The authors declare no conflict