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

Autor(es)

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

• Tipo de documento: Artigo Científico
• Fonte: CHEMISTRY OF MATERIALS; v. N/A, p. 12-pg., 2025-04-16.

Resumo

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)

• Processo FAPESP: 21/06326-1 - Luminescência de íons lantanídeos: uma ferramenta óptica contra falsificações
• Beneficiário: Fernando Aparecido Sigoli
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 21/08111-2 - Materiais conversores de luz à base de terras raras: marcadores luminescentes, sensores e amplificadores ópticos
• Beneficiário: Hermi Felinto de Brito
• Modalidade de apoio: Auxílio à Pesquisa - Temático
• Processo FAPESP: 23/05718-9 - Filmes luminescentes multifuncionais baseados em down-shifting e up-conversion para aplicação em anti-falsificação e micro-LEDs recobertos para tecnologia de displays
• Beneficiário: Leonardo Figueiredo Saraiva
• Modalidade de apoio: Bolsas no Brasil - Doutorado Direto