2013/10/11 by Sebastian Reineke, Marc A. Baldo · 206 citations
Engineering · Materials Science · Physics and Astronomy · #Excited state #Exciton #Luminescence and Fluorescent Materials #Organic Electronics and Photovoltaics #Organic Light-Emitting Diodes Research #Organic semiconductor #Organic solar cell #Phosphorescence #Phosphorescent organic light-emitting diode #Spectroscopy #Triplet state #cond-mat.mes-hall #cond-mat.mtrl-sci #physics.chem-ph
paper · pdf · doi:10.1038/srep03797
published in Scientific Reports 4(1), 3797 (Nature Portfolio) · 27 pages, 6 figures
arxiv created 2013/10/11 · openalex publication_date 2014/01/21 · openalex created_date 2016/06/24 · arxiv updated 2019/06/07 · openalex updated_date 2026/08/05
Organic light-emitting devices and solar cells are devices that create, manipulate, and convert excited states in organic semiconductors. It is crucial to characterize these excited states, or excitons, to optimize device performance in applications like displays and solar energy harvesting. This is complicated if the excited state is a triplet because the electronic transition is 'dark' with a vanishing oscillator strength. As a consequence, triplet state spectroscopy must usually be performed at cryogenic temperatures to reduce competition from non-radiative rates. Here, we control non-radiative rates by engineering a solid-state host matrix containing the target molecule, allowing the observation of phosphorescence at room temperature and alleviating constraints of cryogenic experiments. We test these techniques on a wide range of materials with functionalities spanning multi-exciton generation (singlet exciton fission), organic light emitting device host materials, and thermally activated delayed fluorescence type emitters. Control of non-radiative modes in the matrix surrounding a target molecule may also have broader applications in light-emitting and photovoltaic devices.