TY  - JOUR
AU  - Mullins, Abbi L.
AU  - Ćirić, Aleksandar
AU  - Zeković, Ivana Lj.
AU  - Williams, J. A. Gareth
AU  - Dramićanin, Miroslav
AU  - Radosavjević Evans, Ivana
PY  - 2022
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/10362
AB  - A series of La1−xGa0.99O3:Cr0.01, Ndx phosphors (where x = 0.005, 0.01, 0.02) for luminescence thermometry was synthesised by the solid-state method, structurally characterised using powder X-ray diffraction data, and investigated by ambient and variable-temperature optical measurements. The design principle relies on the use of a combination of transition metal and rare earth activator ions such that the excitation and emission wavelengths fall within the near infra-red spectral region, notably in the ‘first biological window’ that is attractive for potential in vivo applications. The photoluminescence spectra of the compounds feature the characteristic 2E phosphorescence of Cr3+ at 729 nm and the 4F3/2 → 4I9/2 emission of Nd3+ around 890 nm. The Nd3+ emission is quenched at a higher rate than that of Cr3+ with increasing temperature. Thermometric analysis by monitoring the luminescence intensity ratio (LIR) between the emissions of Cr3+ and Nd3+ from 300 K to 650 K shows a quasi-Boltzmann trend, with a maximum relative sensitivity of ∼2% K−1, high absolute sensitivity values over this entire temperature range, excellent temperature resolution of 0.04 K at room temperature, and high stability.
T2  - Journal of Materials Chemistry C
T1  - Dual-emission luminescence thermometry using LaGaO3:Cr3+, Nd3+ phosphors
VL  - 10
IS  - 28
SP  - 10396
EP  - 10403
DO  - 10.1039/D2TC02011D
ER  - 

@article{
author = "Mullins, Abbi L. and Ćirić, Aleksandar and Zeković, Ivana Lj. and Williams, J. A. Gareth and Dramićanin, Miroslav and Radosavjević Evans, Ivana",
year = "2022",
abstract = "A series of La1−xGa0.99O3:Cr0.01, Ndx phosphors (where x = 0.005, 0.01, 0.02) for luminescence thermometry was synthesised by the solid-state method, structurally characterised using powder X-ray diffraction data, and investigated by ambient and variable-temperature optical measurements. The design principle relies on the use of a combination of transition metal and rare earth activator ions such that the excitation and emission wavelengths fall within the near infra-red spectral region, notably in the ‘first biological window’ that is attractive for potential in vivo applications. The photoluminescence spectra of the compounds feature the characteristic 2E phosphorescence of Cr3+ at 729 nm and the 4F3/2 → 4I9/2 emission of Nd3+ around 890 nm. The Nd3+ emission is quenched at a higher rate than that of Cr3+ with increasing temperature. Thermometric analysis by monitoring the luminescence intensity ratio (LIR) between the emissions of Cr3+ and Nd3+ from 300 K to 650 K shows a quasi-Boltzmann trend, with a maximum relative sensitivity of ∼2% K−1, high absolute sensitivity values over this entire temperature range, excellent temperature resolution of 0.04 K at room temperature, and high stability.",
journal = "Journal of Materials Chemistry C",
title = "Dual-emission luminescence thermometry using LaGaO3:Cr3+, Nd3+ phosphors",
volume = "10",
number = "28",
pages = "10396-10403",
doi = "10.1039/D2TC02011D"
}

Mullins, A. L., Ćirić, A., Zeković, I. Lj., Williams, J. A. G., Dramićanin, M.,& Radosavjević Evans, I.. (2022). Dual-emission luminescence thermometry using LaGaO3:Cr3+, Nd3+ phosphors. in Journal of Materials Chemistry C, 10(28), 10396-10403.
https://doi.org/10.1039/D2TC02011D

Mullins AL, Ćirić A, Zeković IL, Williams JAG, Dramićanin M, Radosavjević Evans I. Dual-emission luminescence thermometry using LaGaO3:Cr3+, Nd3+ phosphors. in Journal of Materials Chemistry C. 2022;10(28):10396-10403.
doi:10.1039/D2TC02011D .

Mullins, Abbi L., Ćirić, Aleksandar, Zeković, Ivana Lj., Williams, J. A. Gareth, Dramićanin, Miroslav, Radosavjević Evans, Ivana, "Dual-emission luminescence thermometry using LaGaO3:Cr3+, Nd3+ phosphors" in Journal of Materials Chemistry C, 10, no. 28 (2022):10396-10403,
https://doi.org/10.1039/D2TC02011D . .

TY  - JOUR
AU  - Mullins, Abbi L.
AU  - Ćirić, Aleksandar
AU  - Ristić, Zoran
AU  - Williams, J. A. Gareth
AU  - Radosavjević Evans, Ivana
AU  - Dramićanin, Miroslav
PY  - 2022
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/10219
AB  - A series of LaGa1–xO3:Cr3+x phosphors (x = 0.002, 0.005, 0.01, 0.02, 0.04) were synthesised by solid-state reaction and structurally characterised by Rietveld refinement from powder X-ray diffraction data. Amongst the five compounds, that with x = 0.01 exhibited the highest photoluminescence quantum yield at room temperature, those with higher doping levels probably suffering from self-quenching of the luminescence. This compound was selected for study of the temperature-dependence of the optical properties. The emission spectra recorded over the range 300–600 K reveal distinct features: a broad band that initially increases with temperature, attributed to fluorescence from the 4T2 excited state, and a series of sharp peaks that monotonically decline with temperature, attributed to phosphorescence from the 2E. The thermometry capabilities of LaGa0.99O3:Cr0.01 were probed by the luminescence intensity ratio (LIR) method using the broad 4T2 band relative to the sharp 2E peaks. To overcome the difficulties associated with the significant overlap of the broad and sharp emissions of Cr3+, a novel method was applied in which the deconvolution of broad peaks was performed in two steps, by fitting the broad bands to the curve sections without the sharp peaks. The ratio of the deconvoluted 4T2 and 2E intensities gave an excellent fit to the Boltzmann distribution, with an energy gap between them of 2172 cm–1. The high relative sensitivity at room temperature of ca. 2.5% K–1 demonstrates very good potential of LaGa0.99O3:Cr0.01 for thermometry in the first biological window of transparency, relevant for in vivo biomedical applications.
T2  - Journal of Luminescence
T1  - Double-deconvolution method for the separation of thermalised emissions from chromium-doped lanthanum gallate and its potential in luminescence-based thermometry
VL  - 246
SP  - 118847
DO  - 10.1016/j.jlumin.2022.118847
ER  - 

@article{
author = "Mullins, Abbi L. and Ćirić, Aleksandar and Ristić, Zoran and Williams, J. A. Gareth and Radosavjević Evans, Ivana and Dramićanin, Miroslav",
year = "2022",
abstract = "A series of LaGa1–xO3:Cr3+x phosphors (x = 0.002, 0.005, 0.01, 0.02, 0.04) were synthesised by solid-state reaction and structurally characterised by Rietveld refinement from powder X-ray diffraction data. Amongst the five compounds, that with x = 0.01 exhibited the highest photoluminescence quantum yield at room temperature, those with higher doping levels probably suffering from self-quenching of the luminescence. This compound was selected for study of the temperature-dependence of the optical properties. The emission spectra recorded over the range 300–600 K reveal distinct features: a broad band that initially increases with temperature, attributed to fluorescence from the 4T2 excited state, and a series of sharp peaks that monotonically decline with temperature, attributed to phosphorescence from the 2E. The thermometry capabilities of LaGa0.99O3:Cr0.01 were probed by the luminescence intensity ratio (LIR) method using the broad 4T2 band relative to the sharp 2E peaks. To overcome the difficulties associated with the significant overlap of the broad and sharp emissions of Cr3+, a novel method was applied in which the deconvolution of broad peaks was performed in two steps, by fitting the broad bands to the curve sections without the sharp peaks. The ratio of the deconvoluted 4T2 and 2E intensities gave an excellent fit to the Boltzmann distribution, with an energy gap between them of 2172 cm–1. The high relative sensitivity at room temperature of ca. 2.5% K–1 demonstrates very good potential of LaGa0.99O3:Cr0.01 for thermometry in the first biological window of transparency, relevant for in vivo biomedical applications.",
journal = "Journal of Luminescence",
title = "Double-deconvolution method for the separation of thermalised emissions from chromium-doped lanthanum gallate and its potential in luminescence-based thermometry",
volume = "246",
pages = "118847",
doi = "10.1016/j.jlumin.2022.118847"
}

Mullins, A. L., Ćirić, A., Ristić, Z., Williams, J. A. G., Radosavjević Evans, I.,& Dramićanin, M.. (2022). Double-deconvolution method for the separation of thermalised emissions from chromium-doped lanthanum gallate and its potential in luminescence-based thermometry. in Journal of Luminescence, 246, 118847.
https://doi.org/10.1016/j.jlumin.2022.118847

Mullins AL, Ćirić A, Ristić Z, Williams JAG, Radosavjević Evans I, Dramićanin M. Double-deconvolution method for the separation of thermalised emissions from chromium-doped lanthanum gallate and its potential in luminescence-based thermometry. in Journal of Luminescence. 2022;246:118847.
doi:10.1016/j.jlumin.2022.118847 .

Mullins, Abbi L., Ćirić, Aleksandar, Ristić, Zoran, Williams, J. A. Gareth, Radosavjević Evans, Ivana, Dramićanin, Miroslav, "Double-deconvolution method for the separation of thermalised emissions from chromium-doped lanthanum gallate and its potential in luminescence-based thermometry" in Journal of Luminescence, 246 (2022):118847,
https://doi.org/10.1016/j.jlumin.2022.118847 . .