Dimensionality Reduction Expands the Frontiers of Lanthanide Luminescence Thermometry Beyond Single-Parametric Thermal Sensing

Author(s)

Saraiva, Leonardo F. ; Bispo, Airton G. ; Costa, Andre L. ; Sigoli, Fernando A. ; Lima, Sergio A. M. ; Pires, Ana M.

• Document type: Journal article
• Source: CHEMISTRY OF MATERIALS; v. N/A, p. 12-pg., 2025-04-16.

Abstract

Luminescent thermometers (LThs) are particularly suitable for monitoring submicron-scale thermal changes, spurring substantial advances in the field. Compared with the efforts to maximize the performance of LThs by designing novel materials, few advances have been made at the methodological level to exploit classical thermometric essays. Such a viewpoint motivated this study, which sought to combine data analysis algorithms with multiple thermometric parameters to introduce an advanced perspective on postprocessing data methodologies. Specifically, three distinct dimensionality reduction (DR) algorithms were employed: multiple linear regression (MLR), non-negative matrix factorization (NMF), and kernel principal component analysis (k-PCA). These methods were applied to the proof-of-concept SrY2O4:TbIII/IV,EuIII phosphor using the thermal dependence of the thermally coupled levels of EuIII (Delta) and the 5D0 lifetime (tau). Compared to traditional fitting and integration analyses, the DR approach provided enhanced thermometric performance, achieving a sensitivity increase from 0.897% K-1 (using Delta) to 3.68% K-1 (using k-PCA) and reducing temperature uncertainty below 0.03 K (k-PCA). By moving beyond single parametric thermal sensing with DR, these outcomes enable us to push the limits of luminescence thermometry toward unexplored pathways. (AU)

• FAPESP's process: 21/06326-1 - Luminescence of lanthanide ions: an optical tool against counterfeiting
• Grantee: Fernando Aparecido Sigoli
• Support Opportunities: Regular Research Grants
• FAPESP's process: 21/08111-2 - Development of rare earth based light converters: luminescent markers, optical sensors, and amplifiers
• Grantee: Hermi Felinto de Brito
• Support Opportunities: Research Projects - Thematic Grants
• FAPESP's process: 23/05718-9 - Multifunctional luminescent films based on down-shifting and up-conversion for anti-counterfeiting application and coated micro-LEDs for display technology
• Grantee: Leonardo Figueiredo Saraiva
• Support Opportunities: Scholarships in Brazil - Doctorate (Direct)