Regensburg 2019 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 37: Poster Session III

CPP 37.21: Poster

Wednesday, April 3, 2019, 11:00–13:00, Poster B1

The statistics of photoluminescence quantum yield measurements — •Felix Fries, Heidi Thomas, Max Gmelch, Tim Achenbach, and Sebastian Reineke — IAPP, Technische Universität Dresden, 01187 Dresden, Germany

Measuring the photoluminescence quantum yield (PLQY) is both a well-known and often used method within many different fields of luminescent materials. Knowing a material's PLQY not only allows estimating its use for applications but also gives further insights into the physics within. Calculating the radiative rate of a fluorescent decay is only one of many examples. The common setup comprises a light-source for excitation, an integrating sphere, and a spectrometer or photodiode for signal detection. However, to assure accurate results the measurement relies on a very stable light source.

Here we show that even with low cost devices as LEDs, reliable values with a low statistical error can be obtained. Therefore, we investigate the importance of a right statistical treatment of the measured data. Furthermore, sources of systematic errors in the setup can easily be detected that way.

Evaluating the results of PLQY measurements on solid-state samples of organic molecules showing both fluorescent and phosphorescent emission at room temperature (biluminescence), we are able to deduce information about the singlet's and triplet's PLQY separately and also about intermolecular interaction processes like singlet-triplet annihilation.