scholarly journals Enhancement of the Luminescence Properties of Eu (III) Containing Paramagnetic Saponite Clays

2021 ◽  
Vol 11 (19) ◽  
pp. 8903
Author(s):  
Stefano Marchesi ◽  
Chiara Bisio ◽  
Fabio Carniato
Keyword(s):  
Aqueous Solution ◽  
Energy Transfer ◽  
Hybrid Materials ◽  
Interlayer Space ◽  
Optical Emission ◽  
Luminescence Properties ◽  
Antenna Effect ◽  
Emission Properties ◽  
Two Samples ◽  
Synthetic Saponite

In this study, 1,10-phenanthroline molecules were introduced in the interlayer space of a paramagnetic synthetic saponite clay containing both Eu3+ and Gd3+ ions in structural positions. Two samples with different loading of phenanthroline dye were prepared. The resulting hybrid materials possessed improved optical emission properties due to an efficient antenna effect from the phenanthroline to the Eu3+ centers; this effect was demonstrated to be higher than the metal-to-metal Gd3+-Eu3+ energy transfer previously studied. Insights on the relaxometric properties in aqueous solution of the solids after incorporation of the antenna groups were also obtained through NMR relaxometric analyses.

scholarly journals Comparative Investigation on the Emission Properties of RAl3(BO3)4 (R = Pr, Eu, Tb, Dy, Tm, Yb) Crystals with the Huntite Structure

Crystals ◽  
2019 ◽  
Vol 9 (1) ◽  
pp. 44 ◽  
Author(s):  
Enrico Cavalli ◽  
Nikolay Leonyuk
Keyword(s):  
Energy Transfer ◽  
Comparative Investigation ◽  
Concentration Quenching ◽  
Lattice Defects ◽  
Experimental Results ◽  
Luminescence Properties ◽  
Emission Properties ◽  
Transfer Processes ◽  
Decay Profile ◽  
Excitation Dynamics

The luminescence properties of RAl3(BO3)4 (RAB, with R = Pr, Eu, Tb, Dy, Tm, Yb) huntite crystals grown from K2Mo3O10 flux were systematically characterized in order to investigate their excitation dynamics, with particular reference to the concentration quenching that in these systems is incomplete. To this purpose, selected excitation, emission, and decay profile measurements on diluted R:YAB crystals were carried out and compared with those of the concentrated compounds. The effects of the energy transfer processes and of the lattice defects, as well as the ion-lattice interactions, have been taken into consideration in order to account for the experimental results.

Effect of Ce3+ Concentration on the Luminescence Properties of Ce3+/Er3+/Yb3+ Tri-Doped NaYF4 Nanocrystals

2016 ◽  
Vol 16 (4) ◽  
pp. 3749-3753 ◽  
Author(s):  
Xuee Liu ◽  
Jianbei Qiu ◽  
Xuhui Xu ◽  
Dacheng Zhou
Keyword(s):  
Energy Transfer ◽  
Hydrothermal Method ◽  
Fluorescence Intensity ◽  
Emission Intensity ◽  
Doping Concentration ◽  
Near Infrared ◽  
Luminescence Properties ◽  
Emission Mechanism ◽  
Emission Properties ◽  
Nir Emission

In order to investigate the effect of Ce3+ concentration on the emission properties of Er3+/Yb3+ codoped NaYF4 nanocrystals, Ce3+/Er3+/Yb3+ tri-doped NaYF4 nanocrystals were prepared through a facile EDTA-assisted hydrothermal method. The upconversion (UC) and the near infrared (NIR) emission properties of Er3+ ions were systematically investigated in the NaYF4:Ce3+/Er3+/Yb3+ nanocrystals. Under 980 nm excitation, with the increasing of Ce3+ concentration, the emission intensity of Er3+ at 1550 nm (4I13/2 → 4I15/2) band increases initially and then decreases. The increase of the fluorescence intensity of 1550 nm is due to the energy transfer between Er3+ and Ce3+ ions: Er3+:4I11/2 +Ce3+:2F5/2 → Er3+:4I13/2 +Ce3+:2F7/2. But when Ce3+ doping concentration is 2.0%, the cross relaxation:Er3+:4I13/2 +Ce3+:2F5/2 →Er3+:4I15/2 +Ce3+:2F7/2 happens, which depopulates the 4I13/2 level of Er3+ and results in the decrease of the emission intensity of Er3+ at 1550 nm band. Meanwhile, incorporation of Ce3+ dramatically decreases the visible UC emission intensity. A possible emission mechanism was proposed.

Luminescence Properties and energy transfer mechanism of Eu3+ and Tm3+ Co-doped AlN Thin Films

2021 ◽  
pp. 118082
Author(s):  
Hai Ma ◽  
Xiaodan Wang ◽  
Feifei Chen ◽  
Jiafan Chen ◽  
Xionghui Zeng ◽  
...  
Keyword(s):  
Thin Films ◽  
Energy Transfer ◽  
Transfer Mechanism ◽  
Luminescence Properties ◽  
Energy Transfer Mechanism ◽  
Co Doped

Absorption and emission properties of a europium(II) cryptate in aqueous solution

1982 ◽  
Vol 90 (4) ◽  
pp. 265-268 ◽  
Author(s):  
N. Sabbatini ◽  
M. Ciano ◽  
S. Dellonte ◽  
A. Bonazzi ◽  
V. Balzani
Keyword(s):  
Aqueous Solution ◽  
Absorption And Emission ◽  
Emission Properties

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.

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