Less is more: dimensionality reduction as a general strategy for more precise luminescence thermometry


Thermal resolution (also referred to as temperature uncertainty) establishes the minimum discernible temperature change sensed by luminescent thermometers and is a key figure of merit to rank them. Much has been done to minimize its value via probe optimization and correction of readout artifacts, but little effort was put into a better exploitation of calibration datasets. In this context, this work aims at providing a new perspective on the definition of luminescence-based thermometric parameters using dimensionality reduction techniques that emerged in the last years. The application of linear (Principal Component Analysis) and non-linear (t-distributed Stochastic Neighbor Embedding) transformations to the calibration datasets obtained from rare-earth nanoparticles and semiconductor nanocrystals resulted in an improvement in thermal resolution compared to the more classical intensity-based and ratiometric approaches. This, in turn, enabled precise monitoring of temperature changes smaller than 0.1 degrees C. The methods here presented allow choosing superior thermometric parameters compared to the more classical ones, pushing the performance of luminescent thermometers close to the experimentally achievable limits.




Ximendes, E; Marin, R; Carlos, LD; Jaque, D

nossos autores


This work was supported by the Spanish Ministerio de Ciencia under project PID2019-106211RB-I00 and Ministerio de Economia y Competitividad under project MAT2017-83111R, by the Comunidad Autonoma de Madrid (B2017/BMD-3867 RENIM-CM), and co-financed by the European Structural and Investment fund. Additional funding was provided by the European Union's Horizon 2020 FET Open program (Grant Agreement No. 801305, NanoTBTech), and also by COST action CA17140. E.X. is grateful for a Juan de la Cierva Incorporacion scholarship (IJC2020-045229-I).

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