Ratiometric luminescence nanothermometry carries the potential to measure temperature in conditions for which established strategies are unsuitable. The precision of nanothermometry depends upon the excitation energy, so calibration and monitoring of the optical energy is necessary – a requirement that complicates optical setups and limits nanothermometry in eventualities the place exact energy management or measurement is impractical or unfeasible. Right here, we use Er3+-activated nanothermometers and, apart from the well-known 525/545 nm ratio, outline a second luminescence depth ratio involving the emission at 660 nm. The depth of this emission is strongly correlated with the ability and is obtainable anyhow when utilizing normal spectroscopic instrumentation. We apply symbolic regression to seek out an unambiguous mathematical expression that describes the experimental information. From this mathematical expression, we decide the imply temperature deviation ensuing from the becoming error to be 0.16 Ok and a most temperature precision as small as 6 mK. In abstract, our strategy makes excitation energy measurements in ratiometric luminescent nanothermometry superfluous.
