# NIR-to-NIR lifetime based thermometry with the thermally elongated luminescence kinetics driven by structural phase transition in LiYO2:Yb3+ Source: [NIR-to-NIR lifetime based thermometry with the thermally elongated luminescence kinetics driven by structural phase transition in LiYO2:Yb3+]() Collection index: [llms.txt]() Data updated: 2025-10-27T04:34:05.843Z Authors: M. T. Abbas, M. Szymczak, V. Kinzhybalo, M. Drozd, L. Marciniak Published: 2024-12-04T08:37:55.000Z ## Abstract Among the various techniques used in luminescence thermometry, luminescence kinetics is considered the least sensitive to perturbations related to the optical properties of the medium containing the phosphor. For this reason, temperature sensing and imaging using lifetime-based luminescence thermometers is of high interest for wide range of specific applications. However, for most such thermometers, an increase in temperature leads to a shortening in lifetime, which can hinder the specificity and accuracy of the readout. In this work, we present an approach that utilizes a thermally induced increase in the symmetry of the host material associated with a structural phase transition in LiYO2:Yb3+. Consequently, the lifetime of the excited level 2F5/2 of the Yb3+ ion is thermally prolonged, achieving a relative sensitivity of 0.5%/K. The phase transition temperature can be controlled by adjusting the dopant concentration. Additionally, thermal changes in the emission spectrum enable the use of LiYO2:Yb3+ for ratiometric temperature readout with a relative sensitivity of 5.3%/K at 280K for LiYO2:5%Yb3+. ## Recorded benchmark results A research result applies to its stated dataset, split, metric and evaluation configuration. Compare like-for-like settings, preserve the metric's unit and direction, and distinguish paper-reported results from independent reproduction. The best result recorded here is not a claim of exhaustive, current global coverage. ## Original sources and implementation [Original paper]() [PDF]()