Thermally activated delayed fluorescence as a cycling process between excited singlet and triplet states: Application to the fullerenes

Carlos Baleizão, Mário N. Berberan-Santos
2007 Journal of Chemical Physics  
In efficient thermally activated delayed fluorescence ͑TADF͒ the excited chromophore alternates randomly between the singlet and triplet manifolds a large number of times before emission occurs. In this work, the average number of cycles n is obtained and is shown to have a simple experimental meaning: n + 1 is the intensification factor of the prompt fluorescence intensity, owing to the occurrence of TADF. A new method of data analysis for the determination of the quantum yield of triplet
more » ... eld of triplet formation, combining steady-state and time-resolved data in a single plot, is also presented. Application of the theoretical results to the TADF of ͓70͔fullerenes shows a general good agreement between different methods of fluorescence analysis and allows the determination of several photophysical parameters.
doi:10.1063/1.2734974 pmid:17552781 fatcat:olrsflzh6bhkhgeasmlhdacekq