All near-infrared multiparametric luminescence thermometry using Er3+, Yb3+-doped YAG nanoparticles

Manuscript published in the Open Access Journal: Jovana Periša,Zoran Ristić, Wojciech Piotrowski, Željka Antić,Lukasz Marciniak and Miroslav D. Dramićanin All near-infrared multiparametric luminescence thermometry using Er3+, Yb3+-doped YAG nanoparticles RSC Adv., 2021, 11, 15933 doi:10.1039/d1ra01647d This paper presents four new temperature readout approaches to luminescence nanothermometry in spectral regions of biological transparency demonstrated onYb3+/Er3+-doped yttrium aluminum garnet nanoparticles.Under the 10638 cm-1excitation, down-shifting near infrared emissions (> 10000 cm-1) are identified as those originating from Yb3+ions’2F5/2➝2F7/2(~ 9709 cm-1) and Er3+ions’4I13/2➝4I15/2(~6494 cm-1) electronic transitions and used for 4 conceptually different luminescence thermometry. Observed variations in luminescence parameters with temperature offered an exceptional base for studying multiparametric temperature readouts.These include the temperature-dependence of: (i) intensity ratio between emissions from Stark components of Er3+4I13/2level;(ii) intensity ratio between emissions of Yb3+(2F5/2➝2F7/2transition) and Er3+(4I13/2➝4I15/2transition); (iii) band shift and bandwidth and (iv) lifetime of the Yb3+emission (2F5/2➝2F7/2transition) with maximal sensitivities of1 %K-1,0.8 %K-1,0.09 cm-1K-1, 0.46 %K-1and 0.86 %K-1,respectively. The multimodal temperature readout provided by this material enables its application in different luminescence thermometry setups as well as improved the reliability of the temperature sensing by the cross-validation between measurements.