Journal
JOURNAL OF LUMINESCENCE
Volume 180, Issue -, Pages 25-30Publisher
ELSEVIER
DOI: 10.1016/j.jlumin.2016.07.034
Keywords
Luminescence nanothermometry; Second biological window; Neodymium ions; Relative thermal sensitivity
Categories
Funding
- national funds through the FCT/MEC [FCT UID/CTM/50011/2013]
- FEDER
- EC Marie Curie Initial Training Network LUMINET [316906]
- EU COST action [CM1403]
- Fundacao para a Ciencia e Tecnologia (Portugal) [SFRH/BPD/89003/2012, SFRH/BPD/93884/2013]
- Fundação para a Ciência e a Tecnologia [SFRH/BPD/89003/2012] Funding Source: FCT
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Nd3+-doped nanoparticles have recently emerged as very attractive multifunctional systems with potential for simultaneous bio-imaging and thermal sensing, due to near-infrared excitation and emission within the first (700-980 nm)and second (1000-1400 nm)biological windows. However, while these nanoparticles have been already used for thermal sensing in the first biological window very few studies concern the second biological window. Here, we show that upon 808 nm excitation a thermometer consisting of (Gd1-xNdx)(2)O-3(x=0.020, 0.028and 0.064)nanospheres exhibits a thermal sensitivity of 0.23 +/- 0.03% K-1 at 303 K, operating in the second transparent near infrared biological window. This sensitivity value is achieved by defining the thermometric parameter as the ratio between the integrated intensity of all the transitions originated from the (4)F(3/2)highest-energy Stark component and all the transitions from the (4)F(3/2)lowest-energy. (C) 2016 Elsevier B.V. All rights reserved.
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