Red-tunable LuAG garnet phosphors via Eu3+→Mn4+ energy transfer for optical thermometry sensor application

2021 ◽  
Author(s):  
Bing Yan ◽  
Yi Wei ◽  
Wei Wang ◽  
Meiqian Fu ◽  
Guogang Li
Keyword(s):  
Energy Transfer ◽  
Red Light ◽  
Thermal Quenching ◽  
Garnet Structure ◽  
Sensor Application ◽  
Optical Thermometry ◽  
Narrow Emission ◽  
The Eu

The Eu3+→Mn4+ energy transfer strategy is designed in the Lu3Al5O12 garnet structure to achieve color-adjustable narrow emission from orangish-red to deep-red light and remarkable thermal quenching improvement for optical thermometry sensors.

scholarly journals Facile modulation the sensitivity of Eu2+/Eu3+-coactivated Li2CaSiO4 phosphors through adjusting spatial mode and doping concentration

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Luhui Zhou ◽  
Peng Du ◽  
Li Li
Keyword(s):  
Elevated Temperature ◽  
Solid State ◽  
Doping Concentration ◽  
Thermal Quenching ◽  
Theoretical Discussion ◽  
Spatial Mode ◽  
Quenching Mechanism ◽  
Solid State Reaction Technique ◽  
Optical Thermometry ◽  
The Eu

AbstractSeries of Eu2+/Eu3+-coactivated Li2CaSiO4 phosphors were prepared by solid-state reaction technique. All the samples emitted the unique emissions of Eu2+ and Eu3+ ions when excited by 395 nm, while the strongest emission intensity was received when x = 0.03. On the basis of theoretical discussion, it is evident that crossover relaxation should be responsible for the thermal quenching mechanism which was further proved by the unchanged lifetime at elevated temperature. Besides, through analyzing the inconsistent responses of the emission intensities of the Eu2+ and Eu3+ ions to the temperature, the optical thermometric properties of the designed phosphors were studied. By selecting different emissions of Eu3+ ions and combining with that of the Eu2+ ions, adjustable sensitivities were realized in the resultant phosphors. Furthermore, the sensitivities of the studied compound were also found to be greatly affected by the doping concentration. The maximum absolute and relative sensitivities of the synthesized compounds were 0.0025 K−1 and 0.289% K−1, respectively. These achieved results implied that the Eu2+/Eu3+-coactivated Li2CaSiO4 phosphors were promising candidates for optical thermometry. Additionally, this work also provided promising methods to modulate the sensitivities of the luminescent compounds by adjusting spatial mode and doping concentration.

scholarly journals Energy transfer triggered multicolor emissions in Tb3+/Eu3+-coacitivated Y2Mo3O12 negative thermal expansion micropartices for dual-channel tunable luminescent thermometer

2021 ◽  
Author(s):  
Peng Du ◽  
Laihui Luo ◽  
Yafei Hou ◽  
Weiping Li
Keyword(s):  
Thermal Expansion ◽  
Energy Transfer ◽  
Negative Thermal Expansion ◽  
Thermal Quenching ◽  
High Quality ◽  
Dual Channel ◽  
Color Tunable ◽  
Rational Control

Rational control of thermal quenching performance is crucial for achieving high quality luminescent thermometer. Herein, we report the Tb3+/Yb3+-coactivated Y2Mo3O12 (YMO) negative thermal expansion (NTE) microparticles with color-tunable emissions. Irradiated...

scholarly journals Electrochemiluminescence Study of Europium (III) Complex with Coumarin3-Carboxylic Acid

2008 ◽  
Vol 2008 ◽  
pp. 1-6 ◽  
Author(s):  
Stefan Lis ◽  
Krzysztof Staninski ◽  
Tomasz Grzyb
Keyword(s):  
Aqueous Solution ◽  
Spectral Analysis ◽  
Energy Transfer ◽  
Solid State ◽  
Carboxylic Acid ◽  
Elemental Analysis ◽  
Aluminium Electrode ◽  
The Eu

The europium (III) complex of coumarin-3-carboxylic acid (C3CA) has been prepared and characterized on the basis of elemental analysis, IR, and emission (photoluminescence and electrochemiluminescence) spectroscopy. The synthesised complex having a formula Eu was photophysically characterized in solution and in the solid state. Electrochemiluminescence, ECL, of the system containing the Eu(III)/C3CA complex was studied using an oxide-covered aluminium electrode. The goal of these studies was to show the possibility of the use of electrochemical excitation of the Eu(III) ion in aqueous solution for emission generation. The generated ECL emission was very weak, and therefore its measurements and spectral analysis were carried out with the use of cut-off filters method. The studies proved a predominate role of the ligand-to-metal energy transfer (LMET) in the generated ECL.

scholarly journals Green-to-red light tuning by up-conversion emission via energy transfer in Er3+–Tm3+-codoped germanium–tellurite glasses

2014 ◽  
Vol 392-393 ◽  
pp. 45-50 ◽  
Author(s):  
V.A.G. Rivera ◽  
Y. Ledemi ◽  
M. El-Amraoui ◽  
Y. Messaddeq ◽  
E. Marega
Keyword(s):  
Energy Transfer ◽  
Red Light ◽  
Tellurite Glasses

Energy transfer in and fluorescence studies of the Eu-Tb doped BPA-phen system

2019 ◽  
Vol 66 (8) ◽  
pp. 879-885 ◽  
Author(s):  
Guangbo Xie ◽  
Haibang Zhang ◽  
Zijun Zhang ◽  
Juntong Liu ◽  
Jingjing Zhang ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Fluorescence Studies ◽  
The Eu

An optical thermometry based on abnormal negative thermal quenching of the charge transfer band edge

2019 ◽  
Vol 215 ◽  
pp. 116636
Author(s):  
Dingling Duan ◽  
Yongjie Wang ◽  
Sha Jiang ◽  
Li Li ◽  
Guotao Xiang ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Charge Transfer Band ◽  
Thermal Quenching ◽  
Band Edge ◽  
Optical Thermometry

Strategy for realizing ratiometric optical thermometry via efficient Tb3+-Mn2+ energy transfer in novel apatite-type phosphor Ca9Tb(PO4)5(SiO4)F2

2019 ◽  
Vol 770 ◽  
pp. 1237-1243 ◽  
Author(s):  
Haikun Liu ◽  
Lefu Mei ◽  
Libing Liao ◽  
Yuanyuan Zhang ◽  
Qingfeng Guo ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Optical Thermometry ◽  
Apatite Type

Fluorescence Emission Behavior of Eu(III) Sorbed on Calcium Silicate Hydrates Formed With No Dried Process

2013 ◽  
Author(s):  
Yuichi Niibori ◽  
Masayuki Narita ◽  
Akira Kirishima ◽  
Taiji Chida ◽  
Hitoshi Mimura
Keyword(s):  
Energy Transfer ◽  
Calcium Silicate ◽  
Fluorescence Emission ◽  
Emission Spectra ◽  
Fluorescence Emission Spectra ◽  
Light Water ◽  
Quenching Effect ◽  
Emission Behavior ◽  
Main Component ◽  
The Eu

Calcium silicate hydrate (CSH) is a main component of cement-based material required for constructing the geological repository. As in many countries, since the repository in Japan is constructed below water table, we must consider the interaction of radionuclide with cement materials altered around the repository after the backfill. Using fluorescence emission spectra, so far, the authors have investigated the interaction of Eu(III) (as a chemical analog of Am(III)) with CSH gels formed with no dried process, considering a condition saturated with groundwater. However, in such fluorescence emission behaviors, a deexcitation process of OH vibrators of light water and a quenching effect caused by Eu-Eu energy transfer between Eu atoms incorporated in the CSH gel must be considered. This study examined the fluorescence emission behavior of Eu(III) sorbed on CSH gels formed with no dried process, by using La(III) (non-fluorescent ions) as a diluent of Eu(III). Furthermore, the CSH samples were synthesized with CaO, SiO2, and heavy water (D2O) as a solvent in order to avoid the obvious deexcitation process of OH vibrators of light water. This study prepared CSH samples with the Ca/Si ratio set to 1.6, 1.0, and 0.5. A 1 mM solution of a given combination of Eu(III) and La(III) (Eu(III) content: 100%, 67%, 50% or 33%) was added into CSH gel sample. The contact time-period of the CSH gel with the Eu(III)/La(III) solution was set to 60 days. In the results, the peak around 618 nm was split into two peaks of 613 nm and 622 nm in the cases of Ca/Si = 1.0 and 1.6. Then, the peak of 613 nm decreased with increment of Eu(III)/La(III) ratio. This means that the relative intensity of 613 nm is useful to quantify the amount of Eu(III) incorporated in CSH gel. Besides, the intensity peak of 584 nm decayed with increment of Eu/La ratio, suggesting a quenching effect due to Eu-Eu energy transfer. However, the decay behavior of the fluorescence emission did not depend on the Eu/La concentration ratio. That is, such a quenching effect is neglectable. Additionally, the low Ca/Si ratio samples underwent slow attenuation of fluorescence and showed profiles similar to those of high Ca/Si ratio samples. Therefore, low Ca/Si ratio samples also include the reaction forming a complex on the surface of CSH gel with Eu(III). In other words, even if Ca/Si ratio is lower than 1.0, CSH gels would retard the migration of radionuclides released from the repository.

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