Journal
JOURNAL OF MATERIALS CHEMISTRY C
Volume 5, Issue 33, Pages 8380-8389Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c7tc02655b
Keywords
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Funding
- Engineering and Physical Sciences Research Council, U.K. [EP/M025330/1, EP/L017008]
- EPSRC [EP/M025330/1, EP/L017008/1, EP/K039210/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/L017008/1, EP/M025330/1, EP/K039210/1] Funding Source: researchfish
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Rapid excited-state quenching in the solid state is a widespread limitation for organic chromophores. Even when molecules are dispersed in neutral host matrices, photoluminescence quantum yields decrease sharply with increased concentration, pointing to efficient intermolecular non-radiative decay pathways that remain poorly understood. Here we study the nature of the intermolecular states formed in dispersions of the prototypical BODIPY dyes. Using temperature-dependent and time-resolved photoluminescence measurements, we describe the processes of energy transfer into excimer states and, in materials with suitable chemical structure, excitonically coupled dimers. These dimer states exhibit remarkable near-unity quantum yield.
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