Regensburg 2019 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 12: HL Poster I

HL 12.36: Poster

Montag, 1. April 2019, 17:30–20:00, Poster E

Magnetic resonance of electrochemically fabricated carbon quantum dots — •Theresa Grünleitner¹, Jonathan Zerhoch¹, Martin Stutzmann¹, Martin S. Brandt¹, and Zhenhui Kang² — ¹Walter Schottky Institut and Physik-Department, Technische Universität München, Garching, Germany — ²Functional Nano & Soft Materials Laboratory (FUNSOM), Soochow University, Suzhou, China

Optically detected magnetic resonance is a unique technique to identify the microstructure of excited states leading to fluorescence. In this contribution, we apply this technique to investigate the origin of the luminescence in carbon-based nanoparticles synthesised via alkali-assisted electrochemical fabrication. ODMR measurements show broad structures up to about 600 G, which we assign to Pake doublets caused by triplet excitons. The assignment is corroborated by the observation of the corresponding half-field transitions. We discuss the correlation of this fine structure to the photoluminescence energy of the quantum dots and to the diameter of the particles.