Burning TADF solids reveals their excitons’ mobility - Archive ouverte HAL Access content directly
Journal Articles Journal of Photochemistry and Photobiology A: Chemistry Year : 2022

Burning TADF solids reveals their excitons’ mobility


Nowadays, Thermally Activated Delayed Fluorescence (TADF) compounds have proven to be attractive for highly efficient optoelectronic devices as they can exploit both singlet and triplet excited states generated by charge recombinations that occur in such devices. However, quenching of excited states limits such benefits at high current densities. We have studied the quenching in the case of cationic copper(I) complexes coordinated by both N-heterolytic carbene (NHC) and 2,2′-dipyridylamine (dpa) ligands. Defects are created in their crystals by a strong laser irradiation. Then we have investigated, by analysing their fluorescence decay as a function of temperature, the quenching mechanism and the exciton mobility. Using a time-resolved version of the Perrin’s quenching model, we show that the quenching volume depends on temperature according to the singlet/triplet equilibrium. At room temperature, the singlet states are responsible for 75% of the quenching although they contribute for 2% to the excited states population. From the analysis of the decay curves, we show that the excitons are not mobile in the crystals and are quenched through Förster Resonant Energy Transfer (FRET).
Fichier principal
Vignette du fichier
quenching in crystal of TADF molecules V4.pdf (2.57 Mo) Télécharger le fichier
Origin : Files produced by the author(s)

Dates and versions

hal-03676778 , version 1 (27-10-2022)



Zhengyu Zhang, Arnaud Brosseau, Margaux Elie, Jean-Luc Renaud, Matthieu Hamel, et al.. Burning TADF solids reveals their excitons’ mobility. Journal of Photochemistry and Photobiology A: Chemistry, 2022, 432, pp.114038. ⟨10.1016/j.jphotochem.2022.114038⟩. ⟨hal-03676778⟩
137 View
33 Download



Gmail Facebook X LinkedIn More