Optical spectroscopy of Sm3+ in C2 and C3i sites of Y2O3 ceramics

Lupeǐ, A.; Tiseanu, Carmen; Gheorghe, C.; Voicu, Flavius

doi:10.1007/s00340-012-5196-1

Cited by 26 publications

(23 citation statements)

References 28 publications

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“…Our results provide a first evidence of Sm emission assignable to the substitutional isolated C 2h center (equivalent to center I of Eu). The emission shape is quite similar to that of Sm doped into other hosts with inversion symmetry sites, such as Y 2 O 3 (S 6 /C 3i ) 76 and CeO 2 (O h ) 48 recently reported by some of us. In addition, similar to Eu center I 27 (Fig.…”

Section: Resultssupporting

confidence: 82%

“…Figure 6 summarizes the analysis of luminescence properties of Sm–SnO 2 calcined at 700/1000 °C that gives similar results for the employed methods (rapid hydrothermal and sol-gel). Under above bandgap excitation (280 nm) the emission of Sm (labelled as center I ) displays narrow (~0.7 nm) and relative strong 4 G 5/2 – 6 H 5/2 emission around 568 nm which is mostly of MD nature 76 . A weak intensity is observed for the 4 G 5/2 – 6 H 7/2 transition at 606 and 621 nm which is of mixed magnetic and electric dipole nature 76 while no emission could be detected around 670 nm corresponding to the 4 G 5/2 – 6 H 7/2 transition which is mostly of electric dipolar nature (ED).…”

Section: Resultsmentioning

confidence: 99%

“…Under above bandgap excitation (280 nm) the emission of Sm (labelled as center I ) displays narrow (~0.7 nm) and relative strong 4 G 5/2 – 6 H 5/2 emission around 568 nm which is mostly of MD nature 76 . A weak intensity is observed for the 4 G 5/2 – 6 H 7/2 transition at 606 and 621 nm which is of mixed magnetic and electric dipole nature 76 while no emission could be detected around 670 nm corresponding to the 4 G 5/2 – 6 H 7/2 transition which is mostly of electric dipolar nature (ED). In all, the emission shape is consistent with the substitution of Sn by Sm in the inversion C 2h symmetry sites with no association with a nearby defect.…”

Section: Resultsmentioning

confidence: 99%

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Nanoscale insights into doping behavior, particle size and surface effects in trivalent metal doped SnO2

Cojocaru

Avram

Kessler³

et al. 2017

Sci Rep

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Despite considerable research, the location of an aliovalent dopant into SnO2 nanoparticles is far to be clarified. The aim of the present study on trivalent lanthanide doped SnO2 is to differentiate between substitutional versus interstitial and surface versus bulk doping, delineate the bulk and surface defects induced by doping and establish an intrinsic dopant distribution. We evidence for the first time a complex distribution of intrinsic nature composed of substitutional isolated, substitutional associates with defects as well as surface centers. Such multi-modal distribution is revealed for Eu and Sm, while Pr, Tb and Dy appear to be distributed mostly on the SnO2 surface. Like the previously reported case of Eu, Sm displays a long-lived luminescence decaying in the hundreds of ms scale which is likely related to a selective interaction between the traps and the substitutional isolated center. Analyzing the time-gated luminescence, we conclude that the local lattice environment of the lattice Sn is not affected by the particle size, being remarkably similar in the ~2 and 20 nm particles. The photocatalytic measurements employed as a probe tool confirm the conclusions from the luminescence measurements concerning the nature of defects and the temperature induced migration of lanthanide dopants.

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Section: Resultssupporting

confidence: 82%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Nanoscale insights into doping behavior, particle size and surface effects in trivalent metal doped SnO2

Cojocaru

Avram

Kessler³

et al. 2017

Sci Rep

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“…Eu(1%), Eu(1%) Li(5%), Tb(1%), Tb(1%) Li(5%), Sm(0.1%), Sm(0.1%) Li(5%), Dy(1%), Dy(1%) Li(5%), Er (with concentration of 1, 3, 5 and 7%), Er (1%) Li (5%), and Er(7%) Li (5%) (co)-doped Y 2 O 3 were prepared. Sm concentration was set at 0.1% due to relative intense quenching concentration induced by cross-relaxation on intermediary levels . To determine the effect of the Li component, which is volatile at elevated temperature, the Li, Ln–Y 2 O 3 samples were calcined in air at 800 °C for 4 h. Li-free, Ln–Y 2 O 3 were also calcined at 1000, 1100, and 1300 °C.…”

Section: Methodsmentioning

confidence: 99%

Down-/Up-Conversion Emission Enhancement by Li Addition: Improved Crystallization or Local Structure Distortion?

et al. 2017

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Local symmetry distortion by Li addition is acknowledged as an effective strategy for enhancing the luminescence of lanthanide (Ln) doped into a wide range of lattice hosts. Despite extensive literature, direct evidence that supports Li-induced modification of the local crystal-field at the Ln sites is still missing. Herein, we show that the emission enhancement by Li addition in Ln,Li–Y2O3 is due to improved crystallization and not to local structure distortion. Our approach is based on the premise that any distortion/lowering of the local symmetry would reflect into the alteration of the emission shapes and shortening of the emission decays. To this aim, we have extensively investigated the evolution with Li addition and calcination temperature of down (optical and X-ray induced) and up-conversion (UPC) emission of Ln-Y2O3 measured across the visible to near-infrared range. First, a center to center (corresponding to Ln in the C2 and S6/C3i sites of the cubic Y2O3 lattice) as well as global comparison of the emission properties of Li free and Li codoped Y2O3 are presented by use of Eu, Sm, Tb and Dy as local probes in the visible range. Next, the effect of Li on the up-conversion emission of Er- Y2O3 is analyzed in terms of UPC pathways, emission shape and intensity, decays and excitation spectra. It is concluded that Li addition does not change either the local structure around C2 or S6 Ln centers or the relative contribution of these. Moreover, it is found that the effects of Li doping on the emission properties of Ln–Y2O3 are like extending the calcination temperature of Li-free Ln–Y2O3 from 800 °C to ∼1000–1100 °C. Additionally, a relatively intense 1500 to 980 nm UPC emission is evidenced for the first time for Er–Y2O3, while a relatively intense emission around 1500 nm was measured under X-ray excitation. Taken together, our findings highlight the need for revisiting the traditional optimization strategy based on Li modification but also the promise of Er–Y2O3 nanoparticles for optical/X-ray applications in the near-infrared range.

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“…In the cubic Ln 2 O 3 (Ln ¼ Sc, Y), there are two types of cationic sites, 24 of inversion-less C 2 symmetry and 8 of inversion C 3i symmetry in a unit cell. The doped RE 3þ ions are assumed to occupy randomly both sites in Sc 2 O 3 crystals [39]. The corresponding luminescence spectra are carefully measured and analyzed.…”

Section: Resultsmentioning

confidence: 99%

Synthesis and luminescence properties of RE3+ (RE = Yb, Er, Tm, Eu, Tb)-doped Sc2O3 microcrystals

Qin

Liu

et al. 2015

Journal of Alloys and Compounds

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Optical spectroscopy of Sm3+ in C2 and C3i sites of Y2O3 ceramics

Cited by 26 publications

References 28 publications

Nanoscale insights into doping behavior, particle size and surface effects in trivalent metal doped SnO2

Nanoscale insights into doping behavior, particle size and surface effects in trivalent metal doped SnO2

Down-/Up-Conversion Emission Enhancement by Li Addition: Improved Crystallization or Local Structure Distortion?

Synthesis and luminescence properties of RE3+ (RE = Yb, Er, Tm, Eu, Tb)-doped Sc2O3 microcrystals

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