Berlin 2018 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 20: Poster Session I
CPP 20.60: Poster
Montag, 12. März 2018, 17:30–19:30, Poster A
Temperature Dependent Photoluminescence Studies on Zinc Phthalocyanine Thin Films — •Gabriel Freiherr von Eyb1, Maximilian Frank1, Simon Wiegand1, Sebastian Hammer1, and Jens Pflaum1,2 — 1Experimental Physics VI, Julius Maximilian University of Würzburg, 97074 Würzburg — 2Bavarian Center for Applied Energy Research (ZAE Bayern), 97074 Würzburg
In recent years, there has been many opto-electronic applications implementing zinc phthalocyanine (ZnPc) as active organic component [1]. For the performance of those devices the temperature dependent optical behaviour of ZnPc is of relevance but has not been investigated to a sufficient extent.
In this work we analyse the spectral photoluminescence (PL) of ZnPc thin films in a temperature range of 20 to 360 K. The films under study were prepared by vacuum sublimation on glass and SiO2 substrates. Optical excitation of excitons in the ZnPcs Q-band reveals two main emission components whose intensity varies with temperature. The high energy component experiences a decrease in intensity towards lower temperatures, almost vanishing completely at 20K. The low energy emission decreases as well, but not at the same extent. Combining the temperature dependent PL data with (room temperature) life-time measurements, we will address the role of singlets and triplets in the radiative and non-radiative relaxation processes in ZnPc and discuss possible similarities with a thermally activated delayed fluorescence mechanism.
[1] M. Brendel, et al., Adv. Func. Mater. 25 (2015) 1565