Electronic Energy Levels of the Trivalent Lanthanide Aquo Ions. IV. Eu3+

Carnall, W. T.; Fields, P. R.; Rajnak, K.

doi:10.1063/1.1669896

Cited by 770 publications

(396 citation statements)

References 19 publications

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“…By subtracting both values, an energy difference is obtained which equals the crystal field splitting combined with the total splitting energy of one 4f 6 ( 7 F) term. This can be accurately approximated by using the splitting energy of the 4f 6 ( 7 F) term in Eu 3+ , being 0.62 eV [43,44].…”

Section: Discussionmentioning

confidence: 99%

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Trapping and detrapping inSrAl2O4:Eu,Dypersistent phosphors: Influence of excitation wavelength and temperature

2014

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SrAl 2 O 4 :Eu,Dy is presumably the best known persistent luminescent phosphor. At room temperature, its green emission remains visible for hours after switching off the excitation. It is known that upon lowering the temperature of the phosphor a second photoluminescence emission band arises in the blue part of the visible spectrum, although its origin is still the subject of discussion. In this paper we thoroughly study the origin of both emission bands in SrAl 2 O 4 :Eu,Dy and we attribute this to europium ions substituting for the two different Sr sites in the phosphor's monoclinic host lattice. The photoluminescence properties, the thermal quenching behavior, and photoluminescence lifetime of both emission bands are investigated. A lanthanide energy level scheme is constructed for both sites. Using an integrated approach, i.e., combining charging, afterglow, and thermoluminescence measurements in the same run, we study the charging or trap filling processes in SrAl 2 O 4 :Eu,Dy upon excitation with site selective excitation wavelengths and at different temperatures. We show that trap filling is a thermally activated process when the green emitting center is excited at 435 nm.Furthermore, we also demonstrate that the distribution of filled traps after charging depends strongly on the excitation wavelength and thus on which Eu 2+ center has been excited. This suggests trapping of the electron close to the ionized Eu 2+ ion, without full delocalization to the conduction band during the trapping process. Finally, the quantum efficiency of the persistent luminescence is estimated at 65 (+/−10)%.

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Section: Discussionmentioning

confidence: 99%

“…Usually, cfs (Eu 2+ ,free) is approximated by using the energy level scheme of Eu 3+ . From the degeneracy weighted average of the Eu 3+ 4f 6 ( 7 F J ) multiplets, a value of cfs (Eu 2+ ,free) = 0.39 eV is obtained [43,44].…”

Section: Discussionmentioning

confidence: 99%

Trapping and detrapping inSrAl2O4:Eu,Dypersistent phosphors: Influence of excitation wavelength and temperature

2014

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“…Many studies have shown that Eu 3+ luminescence peak at 5 D 0 ! 7 F 1 transition is relatively strong, and exhibited no/little change on the surrounding ligand environment due to its MD contribution [35][36][37][38][39][40]. Similarly, the 5 D 0 !…”

Section: Luminescence Spectroscopy and Optical Sensing Of Biomarkermentioning

confidence: 99%

Photoluminescence intensity ratio of Eu‐conjugated lactates—A simple optical imaging technique for biomarker analysis for critical diseases

Kakkar

Thomas

Kumi-Barimah

et al. 2017

Journal of Biophotonics

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Instant measurement of elevated biomarkers such as lactic acid offers the most promising approaches for early treatment and prevention of many critical diseases including cardiac arrest, stroke, septic shock, trauma, liver dysfunction, as well as for monitoring lactic acid level during intense exercise. In the present study, a unique dependence of visible photoluminescence of Eu3+ ions resulting from 5D0 to 7FJ(J = 0,1,2,3,4) transitions, which can be exploited for rapid detection of biomarkers, both in vitro and ex vivo, has been reported. It is observed that the integrated intensity ratio of photoluminescence signals dominating at 591 and 616 nm originating from 5D0 to 7F2 and 5D0 to 7F1 transitions in Eu3+ ions can be used as a biosensing and bioimaging tool for detection of biomarkers released at disease states. The Eu3+ integrated photoluminescence intensity ratio approach reported herein for optical detection of lactates in blood serum, plasma and confocal imaging of brain tissues has very high potential for exploitation of this technique in both in vitro monitoring and in vivo bioimaging applications for the detection of biomarkers in various diseases states.

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“…The broad excitation band centred at ~260 nm is due to the O-W/Mo charge transfer. The other excitation peaks originate from the intra-configurational 4f-4f transitions of Eu 3+ from the ground state 7 F0 to the excited states 5 D4, 5 L6 and 5 D2 [34]. The main emission line originates from the forced electric dipole transition, 5 D0 -7 F2.…”

Section: Optical Propertiesmentioning

confidence: 99%

Luminescent Eu3+-doped NaLa(WO4)(MoO4) and Ba2CaMoO6 prepared by the modified Pechini method

Sletnes

Skjærvø

Lindgren

et al. 2015

J Sol-Gel Sci Technol

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Modified Pechini synthesis routes were developed for synthesis of the novel red phosphor materials NaLa(WO4)(MoO4):Eu 3+ and Ba2CaMoO6:Eu 3+ . Phase pure NaLa(WO4)(MoO4):Eu 3+ was obtained at calcination temperatures ≥ 600 °C using malic acid or tartaric acid as complexing agents. Phase pure Ba2CaMoO6:Eu 3+ was attained using EDTA and citric acid, at calcination temperatures ≥ 800 °C. Choice of complexing agents were discussed on the basis of the solubility of the precursors, metal complex stability constants and conformations of the complexes. The powder properties were characterised using X-ray diffraction, thermal analysis and electron microscopy. Photoluminescence emission intensity was studied as a function of the complexing agents used and calcination temperature of the powders. Maximum emission intensity for NaLa(WO4)(MoO4):Eu 3+ was obtained at a calcination temperature of 600 °C, whereas the maximum for Ba2CaMoO6:Eu 3+ was obtained after calcination at 1100 °C. Both materials displayed desirable optical properties for use as phosphors in white light emitting diodes.

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Electronic Energy Levels of the Trivalent Lanthanide Aquo Ions. IV. Eu3+

Cited by 770 publications

References 19 publications

Trapping and detrapping inSrAl2O4:Eu,Dypersistent phosphors: Influence of excitation wavelength and temperature

Trapping and detrapping inSrAl2O4:Eu,Dypersistent phosphors: Influence of excitation wavelength and temperature

Photoluminescence intensity ratio of Eu‐conjugated lactates—A simple optical imaging technique for biomarker analysis for critical diseases

Luminescent Eu3+-doped NaLa(WO4)(MoO4) and Ba2CaMoO6 prepared by the modified Pechini method

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