Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 269, Issue -, Pages 96-102Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2018.04.157
Keywords
Chromium; Luminescent thermometers; Garnets; Nanocrystals; Crystal field; Thermal quenching
Funding
- European Union under the European Regional Development Fund
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Luminescent nanothermometry (LNT) based on temperature-dependent emission intensity of transition metals (TM) is a promising new direction to enhance the performance and implement LNT in many fields of science and technology. However, insightfully understanding and analysis of the luminescence thermal quenching mechanisms in this type of compounds is required. In this work, we study temperature sensitivity (S) modified by crystal field engineering in Gd3Al5-xGaxO12:Cr3+, Nd3+ TM:LNT5. Substituting Al3+ ions in the host matrix by Ga3+ ones, caused gradual decline of crystal field strength from Dq/B = 2.69 for Gd(3)A(5)O(12):Cr3+, Nd3+ to the Dq/B = 2.18 for Gd3Ga5O12:Cr3+,Nd3+. In consequence, improvement of relative sensitivity was observed. Two temperature dependent parameters were taken into considerations as potential temperature measure, i.e. luminescence intensity ratios of T-4(2) -> (4)A(2) (Cr3+) to F-4(3/2) -> I-4(9/2) (Nd3+) and E-2 -> (4)A(2) (Cr3+) to T-4(2) -> (4)A(2) (Cr3+). The proposed method, based on crystal field strength engineering, improved the relative temperature sensitivity by over 1.37%/degrees C for -1 Dq/B change in crystal field strength, from initial 1.2-1.9%/degrees C. (C) 2018 Elsevier B.V. All rights reserved.
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