Lifetime-based luminescence thermometry from Yb3+/Er3+codoped nanoparticles suspended in water

Author(s)

dos Santos, Luiz F. ; Galindo, Jefferson A. O. ; Lima, Karmel de O. ; Pessoa, Allison R. ; Amaral, Anderson M. ; Menezes, Leonardo de S. ; Goncalves, Rogeria R.

• Document type: Journal article
• Source: Journal of Luminescence; v. 262, p. 9-pg., 2023-05-31.

Abstract

The thermal sensing capabilities of Y2O3:Yb3+/Er3+ codoped nanoparticles (NPs) have been extensively studied in recent years for remote luminescent thermometry. However, the use of intensity-based methods for temperature sensing in biological media may be hindered by tissue-induced spectral artifacts, such as light scattering and absorption. To explore alternatives to intensity-based techniques towards bio-sensing applications, we present lifetime-based nanothermometry experiments conducted with a suspension of Y2O3:Yb3+/Er3+ NPs in water. Time-resolved measurements were performed regarding the luminescence from the 2H11/2 (525 nm), 4S3/2 (545 nm), and 4F9/2 (660 nm) excited states of Er3+ for temperatures ranging from 298 K to 338 K. A simplified effective-phonon model was proposed to explain the measured decrease in lifetimes with increasing temperature. The thermometers presented relative sensitivities S ������ of 0.31% K-1, 0.34% K-1 at 310 K for the luminescence bands centered at 525 nm, 545 nm, respectively, and a best ������������ value of 0.50% K-1 at 310 K for luminescence at 660 nm. The results obtained with the red-emitting band under green excitation demonstrate that the lifetime-based nanothermometers can present high S ������ if compared to intensity-based sensors, reinforcing their potential for applications in aqueous and/or biological media. (AU)

• FAPESP's process: 20/05319-9 - Multifunctional plataforms based on lanthanide doped nanostructured luminescent materials for potential photonic and theranostic applications
• Grantee: Rogéria Rocha Gonçalves
• Support Opportunities: Regular Research Grants
• FAPESP's process: 20/04157-5 - Multifunctional Plataform based on luminescent rare earth fluoride and oxide for Theranostics
• Grantee: Luiz Fernando dos Santos
• Support Opportunities: Scholarships in Brazil - Doctorate