Triplet Harvesting with a Simple Aromatic Carbonyl

Torres Ziegenbein, Christian; Fröbel, Sascha; Glöß, Maria; Nobuyasu, Roberto S.; Data, Przemyslaw; Monkman, Andrew; Gilch, Peter

Abstract

The efficiency of organic light-emitting diodes crucially depends on triplet harvesters. These accept energy from triplet correlated electron hole pairs and convert it into light. Here, experimental evidence is given that simple aromatic carbonyls, such as thioxanthone, could serve this purpose. In these compounds, the emissive 1ππ* excitation may rapidly equilibrate with an upper triplet state (3nπ*). This equilibrium may persist for nanoseconds. Population of the 3nπ* state via energy transfer from an electron hole pair should result in fluorescence emission and thereby triplet harvesting. To demonstrate the effect, solutions of 1,4-dichlorobenzene (triplet sensitizer) and thioxanthone (harvester) were excited at 266 nm with a nanosecond laser. The emission decay reveals a 100 ns decay absent in the thioxanthone only sample. This matches predictions for an energy transfer limited by diffusion and gives clear evidence that thioxanthone can convert triplet excitations into light.

Citation

Torres Ziegenbein, C., Fröbel, S., Glöß, M., Nobuyasu, R. S., Data, P., Monkman, A., & Gilch, P. (2017). Triplet Harvesting with a Simple Aromatic Carbonyl. ChemPhysChem, 18(17), 2314-2317. https://doi.org/10.1002/cphc.201700683

• Journal Article Type: Article
• Acceptance Date: Jun 22, 2017
• Online Publication Date: Jul 20, 2017
• Publication Date: Sep 6, 2017
• Deposit Date: Aug 8, 2017
• Publicly Available Date: Jul 20, 2018
• Journal: ChemPhysChem
• Print ISSN: 1439-4235
• Electronic ISSN: 1439-7641
• Publisher: Wiley
• Peer Reviewed: Peer Reviewed
• Volume: 18
• Issue: 17
• Pages: 2314-2317
• DOI: https://doi.org/10.1002/cphc.201700683
• Public URL: https://durham-repository.worktribe.com/output/1349988