Optimization of highly sensitive YAG:Cr3+, Nd3+ nanocrystal-based luminescent thermometer operating in an optical window of biological tissues. Issue 10 (27th February 2017)

• Record Type: Journal Article
• Authors: Marciniak, L.; Bednarkiewicz, A.; Drabik, J.; Trejgis, K.; Strek, W.
• Is Part Of: Physical chemistry chemical physics. Volume 19:Issue 10(2017)
• Page Start: 7343
• Page End: 7351
• Publication Date: 2017-02-27
• Subjects: Chemistry, Physical and theoretical -- Periodicals; 541.3
• DOI: 10.1039/c6cp07213e
• Languages: English
• ISSNs: 1463-9076

Abstract

Abstract : The highest relative sensitivity of YAG:Cr 3+, Nd 3+ luminescent thermometers in physiological temperature range was 3.48% K −1 . Abstract : Luminescent and temperature sensitive properties of YAG:Cr 3+, Nd 3+ nanocrystals were analyzed as a function of temperature, nanoparticle size, and excitation wavelength. Due to numerous temperature-dependent phenomena ( e.g. Boltzmann population, thermal quenching, and inter-ion energy transfer) occurring in this phosphor, four different thermometer definitions were evaluated with the target to achieve a high sensitivity and broad temperature sensitivity range. Using a Cr 3+ to Nd 3+ emission intensity ratio, the highest 3.48% K −1 sensitivity was obtained in the physiological temperature range. However, high sensitivity was compromised by a narrow sensitivity range or vice versa . The knowledge of the excitation and temperature susceptibility mechanisms enabled wise selection of the spectral features found in luminescence spectra for a temperature readout, which enabled the preservation of relatively high temperature sensitivity (>1.2% K −1 max) and extended the temperature sensitivity range from 100 K to 850 K. The size of the nanophosphors had negligible impact on the performance of the studied materials.