Regensburg 2016 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 32: Focus: Triplet States in Organic Optoelectronics I

CPP 32.3: Talk

Wednesday, March 9, 2016, 10:15–10:30, H37

Biluminescence of purely organic semiconductors — •Caterin Salas Redondo, Simone Lenk, and Sebastian Reineke — Institut für Angewandte Photophysik, TU Dresden, Dresden, Germany

Biluminescence is a property of certain organic molecules, where light is emitted from both their singlet (named fluorescence) and triplet (named phosphorescence) excited states. Although the latter is a quantum mechanically forbidden transition, phosphorescence can be achieved if non-radiative channels are suppressed effectively. For instance, creating a simple host:guest system in which a biluminophore (i.e. materials with biluminescence property) is embedded in an optimum rigid matrix (e.g. polymers, small molecules), competitive thermal decay is suppressed, allowing emission from the triplet states in addition to the conventional fluorescence at room temperature. Not only the dual state emission is unique to this class of materials, but also the exciton dynamic range spanned by the two spin states is extreme, going from nanosecond-lifetime fluorescence up to second-lifetime phosphorescence.

In this presentation, we will report on our recent advances in different biluminescent systems. For example, we have identified a combination of PMMA[poly(methyl methacrylate)] as host and NPB[N,N di(naphtha-1-yl)-N,N diphenyl-benzidine] as biluminophore, giving rise to blue fluorescence and green phosphorescence. Additionally, we will report on the structure-property relationships between the host materials used and the resulting phosphorescence luminescence efficiency as well as the dependence of the persistent phosphorescence to oxygen.