Highly-sensitive Eu3+ ratiometric thermometers based on excited state absorption with predictable calibration

被引:139
作者
Souza, Adelmo S. [1 ]
Nunes, Luiz A. O. [2 ]
Silva, Ivan G. N. [3 ]
Oliveira, Fernando A. M. [2 ]
da Luz, Leonis L. [1 ]
Brito, Hermi F. [3 ]
Felinto, Maria C. F. C. [4 ]
Ferreira, Rute A. S. [5 ,6 ]
Junior, Severino A. [1 ]
Carlos, Luis D. [5 ,6 ]
Malta, Oscar L. [1 ]
机构
[1] Univ Fed Pernambuco, CCEN, Dept Quim Fundamental, Cidade Univ, BR-50670901 Recife, PE, Brazil
[2] Univ Sao Paulo, Inst Fis Sao Carlos, BR-13560970 Sao Carlos, SP, Brazil
[3] Univ Sao Paulo, Inst Quim, BR-05508900 Sao Paulo, SP, Brazil
[4] Inst Pesquisas Energet & Nucl, Ctr Quim Meio Ambiente, Ave Prof Lineu Prestes 2242, BR-05508000 Sao Paulo, SP, Brazil
[5] Univ Aveiro, Dept Phys, P-3810193 Aveiro, Portugal
[6] Univ Aveiro, CICECO Aveiro Inst Mat, P-3810193 Aveiro, Portugal
关键词
UPCONVERTING NANOPARTICLES; ENERGY-TRANSFER; TEMPERATURE; NANOTHERMOMETERS; LUMINESCENCE; EMISSION; SENSORS;
D O I
10.1039/c6nr00158k
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
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.
引用
收藏
页码:5327 / 5333
页数:7
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