Luminescent Tungsten(VI) Complexes: Photophysics and Applicability to Organic Light‐Emitting Diodes and Photocatalysis

Abstract

The synthesis, excited‐state dynamics, and applications of two series of air‐stable luminescent tungsten(VI) complexes are described. These tungsten(VI) complexes show phosphorescence in the solid state and in solutions with emission quantum yields up to 22 % in thin film (5 % in mCP) at room temperature. Complex 2 c, containing a 5,7‐diphenyl‐8‐hydroxyquinolinate ligand, displays prompt fluorescence (blue–green) and phosphorescence (red) of comparable intensity, which could be used for ratiometric luminescent sensing. Solution‐processed organic light‐emitting diodes (OLEDs) based on 1 d showed a stable yellow emission with an external quantum efficiency (EQE) and luminance up to 4.79 % and 1400 cd m−2 respectively. These tungsten(VI) complexes were also applied in light‐induced aerobic oxidation reactions.

Long-Lived, Strongly Emissive, and Highly Reducing Excited States in Mo(0) Complexes with Chelating Isocyanides

“…Our study complements ongoing research on photoactive complexes with other Earth-abundant metal elements such as Fe, [9][10][11][12][13][14][15] Cu, [40][41][42][43][44][45][46][47][48][49][50] Cr, [51][52][53][54] Co, 55 Ni, [56][57][58] Zr, [59][60] W, [34][35][61][62][63] and Ce, 64 as well as current research on new metal-free organic photosensitizers. [65][66][67][68][69]…”

Photoredox Catalysis with Metal Complexes Made from Earth‐Abundant Elements

“…[8a, 86] Another interesting avenue may open up with d 0 complexes given the recent developmentso ne missive W VI complexes. [87] Newly explored luminescent Cr 0 , [8b, 74b, 88] [Cu(dap) 2 ] + [a] 0.62 À1.43400-600 (À)670 (À) [a] 760 (À) [b] 590 (À) [c] 2.05 270 ns [a] 130 ns [b] 560 ns [d] MLCT [23,26] [ [f] Reported vs. Ag/AgCl, converted to SCE by subtracting4 5mV. [94] [g] Reported vs. Fc, converted to Ag/AgCla ccordingt or ef.…”

Mechanosynthesis and photophysics of colour-tunable photoluminescent group 13 metal complexes with sterically demanding salen and salophen ligands

“…, organometallic chemistry, organo-catalysis, energy materials, APIs or MOFs, among others). 1,2 Minimising, or avoiding, the use of fossil fuel derived solvents can provide an advantage over conventional solution-based methods by reducing the solvent waste and, thus, eliminating time- and energy-consuming solvent removal steps. In addition, generally, mechanochemical processes do not require external heating for the reactions to proceed.…”