Temperature-dependent nitrogen-vacancy (NV)-center relaxometry is an established tool to characterize paramagnetic molecules near to a sensing diamond, gaining momentum in different fields of science. However, recent results indicate that conversion between NV-center charge states impedes these measurements and influences the results for the T1 time. While the temperature dependence of NV centers' T1 time is well-studied, additional contributions from temperature-dependent charge conversion during the dark time may further affect the measurement results. We combine temperature-dependent relaxometry and fluorescence spectroscopy at varying laser powers to unravel the temperature dependence of charge conversion in nanodiamond for biologically relevant temperatures. While we observe a decrease of the T1 time with increasing temperatures, charge conversion remains unaffected by the temperature change. These results allow the temperature dependent performance of T1 relaxometry without further consideration of temperature dependence of charge conversion.
@article{arxiv.2309.12131,
title = {Temperature dependence of charge conversion during NV-center relaxometry},
author = {Isabel Cardoso Barbosa and Jonas Gutsche and Dennis Lönard and Stefan Dix and Artur Widera},
journal= {arXiv preprint arXiv:2309.12131},
year = {2023}
}