Highly-sensitive Eu(3+) ratiometric thermometers based on excited state absorption with predictable calibration.

Autor: Souza AS; Departamento de Química Fundamental-CCEN-UFPE, Cidade Universitária, Recife-PE, 50670-901, Brazil. adelmosaturnino@hotmail.com., Nunes LA; Instituto de Física de São Carlos, Universidade de São Paulo - USP, CEP 13560-970, São Carlos, SP, Brazil., Silva IG; Instituto de Química, Universidade de São Paulo, 05508-900 São Paulo, SP, Brazil., Oliveira FA; Instituto de Física de São Carlos, Universidade de São Paulo - USP, CEP 13560-970, São Carlos, SP, Brazil., da Luz LL; Departamento de Química Fundamental-CCEN-UFPE, Cidade Universitária, Recife-PE, 50670-901, Brazil. adelmosaturnino@hotmail.com., Brito HF; Instituto de Química, Universidade de São Paulo, 05508-900 São Paulo, SP, Brazil., Felinto MC; Centro de Química do Meio Ambiente, Instituto de Pesquisas Energéticas e Nucleares, Av. Prof. Lineu Prestes, 2242, 05508-000 São Paulo, SP, Brazil., Ferreira RA; Department of Physics and CICECO Aveiro Institute of Materials, University of Aveiro, 3810-193 Aveiro, Portugal. lcarlos@ua.pt., Júnior SA; Departamento de Química Fundamental-CCEN-UFPE, Cidade Universitária, Recife-PE, 50670-901, Brazil. adelmosaturnino@hotmail.com., Carlos LD; Department of Physics and CICECO Aveiro Institute of Materials, University of Aveiro, 3810-193 Aveiro, Portugal. lcarlos@ua.pt., Malta OL; Departamento de Química Fundamental-CCEN-UFPE, Cidade Universitária, Recife-PE, 50670-901, Brazil. adelmosaturnino@hotmail.com.
Jazyk: angličtina
Zdroj: Nanoscale [Nanoscale] 2016 Mar 07; Vol. 8 (9), pp. 5327-33.
DOI: 10.1039/c6nr00158k
Abstrakt: Temperature measurements ranging from a few degrees to a few hundreds of Kelvin are of great interest in the fields of nanomedicine and nanotechnology. Here, we report a new ratiometric luminescent thermometer using thermally excited state absorption of the Eu(3+) ion. The thermometer is based on the simple Eu(3+) energy level structure and can operate between 180 and 323 K with a relative sensitivity ranging from 0.7 to 1.7% K(-1). The thermometric parameter is defined as the ratio between the emission intensities of the (5)D0 → (7)F4 transition when the (5)D0 emitting level is excited through the (7)F2 (physiological range) or (7)F1 (down to 180 K) level. Nano and microcrystals of Y2O3:Eu(3+) were chosen as a proof of concept of the operational principles in which both excitation and detection are within the first biological transparent window. A novel and of paramount importance aspect is that the calibration factor can be calculated from the Eu(3+) emission spectrum avoiding the need for new calibration procedures whenever the thermometer operates in different media.
Databáze: MEDLINE
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