Luminescence of Tb-based materials doped with Eu3+: case studies for energy transfer processes

Carrasco, I.; Piccinelli, Fabio; Bettinelli, Marco

doi:10.1016/j.jlumin.2016.06.065

Cited by 40 publications

(26 citation statements)

References 51 publications

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“…[46] This very weak emission indicatese fficient energy transfer from Tb 3 + to Eu 3 + . [47] Such Tb 3 + !Eu 3 + energy transfer has previously been observed, for instance, in Tb 3 + /Eu 3 + doped solid-state phosphors [48][49][50][51][52][53] as well as in molecularc ompounds. [54][55][56][57][58][59][60] Note that in case of needle-like 3a,t he relative Tb 3 + emission is even weaker than in the case of 3b and 3c indicatingamore efficient Tb 3 + !…”

Section: Opticalproperties:e Mission Spectroscopymentioning

confidence: 81%

Probing Optical Anisotropy and Polymorph‐Dependent Photoluminescence in [Ln₂] Complexes by Hyperspectral Imaging on Single Crystals

Errulat

Gabidullin

Murugesu

et al. 2018

Chemistry A European J

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Two homodinuclear and one heterodinuclear lanthanide (Ln)-based complexes of the general formula [Ln (bpm)(tfaa) ] (Ln=Eu (1), Tb (2), Eu-Tb (3), bpm=2,2'-bipyrimidine, tfaa =1,1,1-trifluoroacetylacetonate) were synthesized and characterized by single-crystal photoluminescence spectroscopy and hyperspectral imaging. Complexes 1 and 2 crystallize in two polymorphic structures, while three polymorphs were isolated for 3, namely having needle-, plate-, and block-like morphologies. Single-crystal photoluminescence spectroscopy and imaging on Eu -containing 1 and 3 revealed polymorph-dependent J-splitting of the hypersensitive D → F Eu transition as well as electric-to-magnetic dipole emission intensity ratios. According to these observations, the lowest symmetry chemical environment was attributed to the Eu ions present in the needle-like polymorph, also in agreement with single-crystal X-ray diffraction analysis. More importantly, hyperspectral imaging on all three single-crystal polymorphs of 3 exhibits optical anisotropy with photoluminescence enhancement at specific crystallographic faces. This behavior was ascribed to the distinct molecular packing of the Ln-Ln dimers in each polymorphic crystal as well as to face-specific local symmetry of the Eu centers. Overall, opto-structural relationships of three Ln-Ln dimers and their single-crystal polymorphs were established as a particularly promising avenue for control of photoluminescence by chemical crystal engineering.

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Section: Opticalproperties:e Mission Spectroscopymentioning

confidence: 81%

Probing Optical Anisotropy and Polymorph‐Dependent Photoluminescence in [Ln₂] Complexes by Hyperspectral Imaging on Single Crystals

Errulat

Gabidullin

Murugesu

et al. 2018

Chemistry A European J

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“…In order to further prove that there is energy transfer between Eu 3+ /Tb 3+ , the fluorescence decay curve of y% Eu 2 O 3 –0.4%Tb 4 O 7 (y = 0, 0.25, 0.5, 0.75, 1.0, 1.25) exponential fitting function is calculated by ). As the concentration of Eu 2 O 3 increases, the fluorescence lifetime gradually decreases 24 . As shown in Figure 8.

I = I_{0} + A_{1} \exp ((), - \frac{τ}{τ_{1}}) + A_{2} \exp ((), - \frac{τ}{τ_{2}})

…”

Section: Resultsmentioning

confidence: 95%

Luminescence properties and energy transfer of Eu³⁺/Tb³⁺ co‐doped glass ceramics containing Na₃Gd(PO₄)₂

Chen

Jia

Zou

et al. 2020

J Chinese Chemical Soc

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Tb 3+ -doped and Eu 3+ /Tb 3+ co-doped transparent glass ceramics containing Na 3 Gd(PO 4 ) 2 crystal phase were prepared by melt crystallization. The types of crystals, grain size, and optical transmittance of the samples were investigated by X-ray diffraction (XRD), scanning electron microscope (SEM), and UV visible absorption spectrometer. The effect of different heat treatment time on grain size, crystal morphology, and light transmittance was also studied. The luminescence performance of transparent glass ceramics was systematically studied by the excitation spectrum, emission spectrum, and the fluorescence lifetime. The optimal doping concentration of Tb 3+ doped and Eu 3+ /Tb 3+ codoped were determined. When the mole percent concentration of Tb 4 O 7 was 0.4%, the strongest green light was obtained at 546 nm ( 5 D 4 ! 7 F 5 ). Meanwhile, the energy transfer process between Eu 3+ and Tb 3+ was discussed.Under the excitation of 374 nm, white light can be obtained by adjusting the concentration ratio of Eu 3+ and Tb 3+ . K E Y W O R D Senergy transfer, Eu 3+ /Tb 3+ co-doped, glass ceramics, Na 3 Gd (PO 4 ) 2

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“…The luminescence characteristics of lanthanide ions, in principle, can be improved by introducing a sensitizer that can assist for its indirect excitation efficiently. As an instance, Eu 3+ ions can be sensitized by Tb 3+ ions due to the favorable positioning of their excited states. ,,, The role of terbium ions as a sensitizer in WO 3 :Tb x 3+Eu y 3+ ( x = 0–0.05 and y = 0–0.10) is therefore investigated.…”

Section: Resultsmentioning

confidence: 99%

“…As an instance, Eu 3+ ions can be sensitized by Tb 3+ ions due to the favorable positioning of their excited states. 29,38,45,46 The role of terbium ions as a sensitizer in WO 3 :Tb x 3+Eu y 3+ (x = 0−0.05 and y = 0−0.10) is therefore investigated.…”

Section: ■ Experimental Sectionmentioning

confidence: 99%

Terbium Ion-Mediated Energy Transfer in WO₃:Tb³⁺ and Eu³⁺ Phosphors for UV-Sensitized White Light Emission

et al. 2021

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Incorporation of suitable lanthanide (Ln 3+ ) ions into semiconducting WO 3 can be useful to produce host-sensitized luminescence for solid-state lighting applications. Codoping of another Ln 3+ ion can assist in transferring energy from the host to the activator Ln 3+ ion to produce bright luminescence depending upon the electronic structure of the doped system. As a case study, Eu 3+ and Tb 3+ ion−doped WO 3 phosphors (WO 3 :Tb 3+x Eu 3+ y , x = 0−0.05 and y = 0−0.20) have been prepared over a wide range of doping concentrations to investigate the role of the Tb 3+ ion as a sensitizer and realize host-sensitized emission from Eu 3+ ions. The steady-state and time-resolved photoluminescence (TRPL) data for WO 3 :Tb 3+x Eu 3+ y (x = 0−0.05 and y = 0−0.10) samples confirm that Tb 3+ ions assist in excitation of Eu 3+ ions via sequential energy transfers from the host to Tb 3+ ions followed by Tb 3+ to Eu 3+ ions. The energy transfer process is controlled by optimizing their doping concentrations, and a single-phase white-light-emitting phosphor with a composition WO 3 :Tb 3+ 0.05 Eu 3+ 0.0005 has been developed. The electronic band structures and projected density of state plots for the WO 3 :Tb 3+ 0.03125 Eu 3+ 00.03125 system obtained using density functional theory (DFT)-based simulations confirm the formation of impurity states due to Eu 3+ and Tb 3+ ions within the forbidden gap of WO 3 . Based on the TRPL and DFT data, it is confirmed that the Tb 3+ ions act as a bridge between the conduction band edge of WO 3 and excited states of Eu 3+ ions to transfer energy and facilitate characteristic emission from europium species.

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Luminescence of Tb-based materials doped with Eu3+: case studies for energy transfer processes

Cited by 40 publications

References 51 publications

Probing Optical Anisotropy and Polymorph‐Dependent Photoluminescence in [Ln₂] Complexes by Hyperspectral Imaging on Single Crystals

Probing Optical Anisotropy and Polymorph‐Dependent Photoluminescence in [Ln₂] Complexes by Hyperspectral Imaging on Single Crystals

Luminescence properties and energy transfer of Eu³⁺/Tb³⁺ co‐doped glass ceramics containing Na₃Gd(PO₄)₂

Terbium Ion-Mediated Energy Transfer in WO₃:Tb³⁺ and Eu³⁺ Phosphors for UV-Sensitized White Light Emission

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Luminescence of Tb-based materials doped with Eu3+: case studies for energy transfer processes

Cited by 40 publications

References 51 publications

Probing Optical Anisotropy and Polymorph‐Dependent Photoluminescence in [Ln2] Complexes by Hyperspectral Imaging on Single Crystals

Probing Optical Anisotropy and Polymorph‐Dependent Photoluminescence in [Ln2] Complexes by Hyperspectral Imaging on Single Crystals

Luminescence properties and energy transfer of Eu3+/Tb3+ co‐doped glass ceramics containing Na3Gd(PO4)2

Terbium Ion-Mediated Energy Transfer in WO3:Tb3+ and Eu3+ Phosphors for UV-Sensitized White Light Emission

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Probing Optical Anisotropy and Polymorph‐Dependent Photoluminescence in [Ln₂] Complexes by Hyperspectral Imaging on Single Crystals

Probing Optical Anisotropy and Polymorph‐Dependent Photoluminescence in [Ln₂] Complexes by Hyperspectral Imaging on Single Crystals

Luminescence properties and energy transfer of Eu³⁺/Tb³⁺ co‐doped glass ceramics containing Na₃Gd(PO₄)₂

Terbium Ion-Mediated Energy Transfer in WO₃:Tb³⁺ and Eu³⁺ Phosphors for UV-Sensitized White Light Emission