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Dresden 2017 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 26: Molecular Electronics and Excited State Properties

CPP 26.8: Vortrag

Dienstag, 21. März 2017, 15:45–16:00, ZEU 260

Absolute optical sensor based on biluminescence — •Caterin Salas Redondo and Sebastian Reineke — Dresden Integrated Center for Applied Physics and Photonic Materials, Dresden, Germany

According to the selection rules in quantum mechanics, only transitions from the singlet excited state are allowed, deactivating radiatively while generating fluorescence emission, whereas transitions from the triplet excited state are theoretically not allowed. Nevertheless, there is a small probability of these forbidden transitions to occur at a low rate, resulting in a slow radiative deactivation known as phosphorescence emission. In this context, the property of an organic molecule able to emit photons from both their singlet and triplet excited states is called biluminescence. Although this dual state emission, particularly at room temperature, is difficult to achieve by purely organic molecules, it becomes possible if competitive non-radiative decay is suppressed effectively, allowing emission from the triplet states (i.e. phosphorescence) in addition to the conventional fluorescence. Here, we have identified biluminescence in simple host:guest systems in which a biluminophore is embedded in an optimum rigid matrix, for example, a combination of PMMA [poly(methyl methacrylate)] as host and NPB [N,N'-di(naphtha-1-yl)-N,N'-diphenyl-benzidine] as biluminophore. In this presentation, we will report on the oxygen sensing characteristics of a biluminescent system compared to a benchmarked single state optical sensor. Furthermore, we will address our efforts towards the potential integration of novel optical biluminescent sensing into organic electronics.

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