Speeding‐up Thermally Activated Delayed Fluorescence in Cu(I) Complexes Using Aminophosphine Ligands

Abstract

Luminescent copper(I) complexes presenting thermally activated delayed fluorescence (TADF) have drawn attention as emitters for organic light emitting diodes (OLEDs). While the majority of ligands used have nitrogen as donor atoms, in this work, we report the synthesis and characterization of three copper(I) complexes with the diimine ligand 1,10-phenanthroline and aminophosphine-derived ligands containing the piperazine and N,N'-dimethylethylenediamine to evaluate their effect into the emission properties. The photophysical studies as a function of temperature suggested TADF and phosphorescence emission, supported by detailed density functional theory (DFT) calculations. The use of aminophosphine ligands enhance the TADF decay pathway in comparison with copper complex containing the usual POP ligand. These properties, combined with the appropriate HOMO-LUMO energy levels and thermal stability, make these compounds a promising alternative for application in OLEDs.

What are the prospects for using complexes of copper(ii) and zinc(ii) to suppress the vital activity ofMycolicibacterium smegmatis?

“…For all complexes, low intensity absorption bands lying in the region of 300–350 nm are attributed to metal-to-ligand charge-transfer (MLCT). 48,49 Saline solutions of 1 , 2 and 5 are stable at room temperature for 48 hours, as no significant changes in the absorbance were noticed. However, prolonged storage of aforementioned species resulted in general decreasing of absorbance because of complex aggregation processes.…”

Influence of perhalophenyl groups in the TADF mechanism of diphosphino gold(i) complexes

“…Contributions from the TADF and phosphorescence decay paths at 300 K can also be estimated by comparing the rates of the individual processes using 14–16 k (combined) = k (TADF) + k (T 1 )With k (combined) = k (300 K) = 9.7 × 10 4 ( 1 ), 4.5 × 10 4 ( 2 ), 10 × 10 4 ( 3 ), 10.3 × 10 4 ( 4 ), 11 × 10 4 s −1 ( 5 ), and k (T 1 ) = 2.8 × 10 4 ( 1 ), 1.4 × 10 4 ( 2 ), 3.1 × 10 4 ( 3 ), 2.9 × 10 4 ( 4 ), 2.9 × 10 4 s −1 ( 5 ). We find k (TADF) = 6.9 × 10 4 ( 1 ), 3.1 × 10 4 ( 2 ), 7.0 × 10 4 ( 3 ), 7.1 × 10 4 ( 4 ) and 7.7 × 10 4 s −1 ( 5 ).…”

“…Contributions from the TADF and phosphorescence decay paths at 300 K can also be estimated by comparing the rates of the individual processes using [14][15][16]…”

Heteroleptic copper(i) complexes with coumarin-substituted aminodiphosphine and diimine ligands: synthesis and photophysical studies

“…For instance, aminodiphosphines, which otherwise have prominent applications in coordination chemistry, have been relatively scarcely employed in the synthesis of heteroleptic copper complexes. 20,21 The introduction of efficient chromophores as ligand substituents may further impact the optical properties. 22,23 Recently, we introduced a coumarin functionalized aminodiphosphine (Scheme 1) as a bidentate ligand for the synthesis of homoleptic mono-, di-and trimetallic copper and silver complexes.…”