Dresden 2026 – wissenschaftliches Programm

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FM: Fachverband Funktionsmaterialien

FM 7: Crystal Defects and Real Structure Physics in Diamond and Functional Materials I

FM 7.1: Vortrag

Dienstag, 10. März 2026, 09:30–09:45, BEY/0E40

Fluorescence lifetime measurements of NV- and NV0 color center ensembles at room temperature and 4K in HPHT, CVD and nanodiamond samples — •Kai Kühnlenz, Kevin Lauer, Phillip Kellner, Mario Bähr, Andreas T. Winzer, and Thomas Ortlepp — CiS Forschungsinstitut für Mikrosensorik GmbH, Konrad-Zuse-Str. 14, 99099 Erfurt, Deutschland

Nitrogen vacancy (NV) centers in diamond are key solid-state quantum emitters whose photophysical properties depend on their charge state and the surrounding diamond lattice. We analyze diamond samples made of chemical vapor deposition- (CVD), high-pressure-high-temperature- (HPHT) or nanodiamond material by exciting them with a 513nm green laser and detecting the fluorescence light via time resolved photoluminescence (TRPL). This work presents measurements of the fluorescence lifetime of NV-ensembles. Hereby a monochromator is employed to detect 20nm wide spectral bands centered at the NV- phonon sideband (710nm) and the zero-phonon-lines of NV- and NV0 (638nm and 575nm) to differentiate between the charge states. Measurements are performed at both room temperature (293K) and 4K. The influence of varying excitation laser power and of the selected spectral detection window is investigated and compared with established reference values. The measurement approach allows a systematic comparison of NV-diamond materials and provides a baseline for quantitative lifetime-based characterization of NV ensembles.

Keywords: NV Center; fluorescence lifetime; time resolved photoluminescence