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http://hdl.handle.net/10773/19469
Title: | Highly-sensitive Eu3+ ratiometric thermometers based on excited state absorption with predictable calibration |
Author: | Souza, Adelmo S. Nunes, Luiz A. O. Silva, Ivan G. N. Oliveira, Fernando A. M. da Luz, Leonis L. Brito, Hermi F. Felinto, Maria C. F. C. Ferreira, Rute A. S. Junior, Severino A. Carlos, Luis D. Malta, Oscar L. |
Keywords: | UPCONVERTING NANOPARTICLES LUMINESCENT NANOTHERMOMETERS FLUORESCENT NANOTHERMOMETERS TEMPERATURE-MEASUREMENTS ENERGY-TRANSFER LIVING CELLS NANOSCALE SENSORS EMISSION |
Issue Date: | 2016 |
Publisher: | ROYAL SOC CHEMISTRY |
Abstract: | 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 Eu3+ ion. The thermometer is based on the simple Eu3+ 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 D-5(0) -> F-7(4) transition when the D-5(0) emitting level is excited through the F-7(2) (physiological range) or F-7(1) (down to 180 K) level. Nano and microcrystals of Y2O3:Eu3+ 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 Eu3+ emission spectrum avoiding the need for new calibration procedures whenever the thermometer operates in different media. |
Peer review: | yes |
URI: | http://hdl.handle.net/10773/19469 |
DOI: | 10.1039/c6nr00158k |
ISSN: | 2040-3364 |
Publisher Version: | 10.1039/c6nr00158k |
Appears in Collections: | CICECO - Artigos |
Files in This Item:
File | Description | Size | Format | |
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Highly-sensitive Eu3+ ratiometric thermometers based on excited state absorption with predictable calibration_10.1039c6nr00158k.pdf | 1.19 MB | Adobe PDF |
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