SnO2:Eu nanoparticles dispersed in silica: A low-temperature synthesis and photoluminescence study

Ningthoujam, R. S.; Sudarsan, V.; Kulshreshtha, S. K.

doi:10.1016/j.jlumin.2007.05.004

Cited by 88 publications

(55 citation statements)

References 29 publications

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“…The blue shift of Eu-O CT band with respect to as-prepared sample indicates increase of ionicity with annealing. In pure Eu 2 O 3 , 42 there is no absorption peak at ∼340-350 nm and also intensity of Eu-O CT band is more than that of Eu 3+ (399 nm). In this study, absorption intensity in ∼340-350 nm is very high and also intensity of Eu-O 4 and ZnO.…”

Section: Excitation Studymentioning

confidence: 92%

Observation of intermediate bands in Eu3+ doped YPO4 host: Li+ ion effect and blue to pink light emitter

Parchur¹,

Prasad²,

Bahadur³

et al. 2012

AIP Advances

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This article explores the tuning of blue to pink colour generation from Li+ ion co-doped YPO4:5Eu nanoparticles prepared by polyol method at ∼100-120 °C with ethylene glycol (EG) as a capping agent. Interaction of EG molecules capped on the surface of the nanoparticles and/or created oxygen vacancies induces formation of intermediate/mid gap bands in the host structure, which is supported by UV-Visible absorption data. Strong blue and pink colors can be observed in the cases of as-prepared and 500 °C annealed samples, respectively. Co-doping of Li+ enhances the emission intensities of intermediate band as well as Eu3+. On annealing as-prepared sample to 500 °C, the intermediate band emission intensity decreases, whereas Eu3+ emission intensity increases suggesting increase of extent of energy transfer from the intermediate band to Eu3+ on annealing. Emission intensity ratio of electric to magnetic dipole transitions of Eu3+ can be varied by changing excitation wavelength. The X-ray photoelectron spectroscopy (XPS) study of as-prepared samples confirms the presence of oxygen vacancies and Eu3+ but absence of Eu2+. Dispersed particles in ethanol and polymer film show the strong blue color, suggesting that these materials will be useful as probes in life science and also in light emitting device applications

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Section: Excitation Studymentioning

confidence: 92%

Observation of intermediate bands in Eu3+ doped YPO4 host: Li+ ion effect and blue to pink light emitter

Parchur¹,

Prasad²,

Bahadur³

et al. 2012

AIP Advances

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“…The excitation spectrum of intrinsic luminescence shows a hydrogen like series of excitonic lines with the first exciton peak at 3.6 eV and with an exciton binding energy of 32 meV. 55 Excitation spectra of Eu 3+ emission in SnO 2 reveal an intense excitation band around the host excitation [56][57][58][59] which provides a lower bound on the CT-band energy of Eu 3+ , see arrow 1 in Fig. 6.…”

Section: -54mentioning

confidence: 99%

The Electronic Structure of Lanthanide Impurities in TiO₂, ZnO, SnO₂, and Related Compounds

Dorenbos

2013

ECS J. Solid State Sci. Technol.

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The vacuum referred binding energy of electrons in the 4f n levels for all divalent and trivalent lanthanide impurity states in TiO 2 , ZnO, SnO 2 , and related compounds MTiO 3 and MSnO 3 (M = Ca 2+ , Sr 2+ , Ba 2+ ) and Ca 2 SnO 4 are presented. They are obtained by collecting data from the literature on the spectroscopy of lanthanide ions, and by combining that data with the chemical shift model. The model provides the energy at the top of the valence band and at the bottom of the conduction band, and it will be shown that those energies are in excellent agreement with what is known from techniques like photo-electron spectroscopy and electrochemical studies. Electronic level diagrams are presented that explain and predict aspects like absence or presence of lanthanide 4f-4f or 5d-4f emissions and the preferred lanthanide valence. © 2013 The Electrochemical Society. [DOI: 10.1149/2.005403jss] All rights reserved.Manuscript received October 17, 2013. Published December 20, 2013 Recently the chemical shift model was introduced 1 for the lanthanide impurities in compounds. By using spectroscopic data for different lanthanides like Ce 3+ , Pr 3+ , Tb 3+ , Eu 3+ , Yb 3+ in the same compound, the model enables to derive the electronic structure with the absolute electron binding energies, i.e., relative to the energy of the electron at rest in vacuum, in all divalent and all trivalent lanthanides.2 It has been applied to about 50 different compounds (fluorides, chlorides, aluminates, phosphates, borates etc.) and full consistency with available experimental data from different fields of science was demonstrated.2-4 It was found that in inorganic compounds based on rare earth cations, like YPO 4 and LaBO 3 , and/or alkaline and/or alkaline earth cations like CaF 2 and CaGa 2 S 4 , the binding energy at the bottom of the conduction band E C is typically near −2 eV. Sc-based compounds like ScBO 3 and ScPO 4 tend to show lower values for E C which was attributed to a large binding energy of electrons in the 3d-shell of Sc 3+ /Sc 2+ that forms the bottom of the conduction band. 4 In this work the model will be applied to TiO 2 , ZnO, SnO 2 , and related ternary compounds. The compounds were selected because of their high importance for many applications.TiO 2 has been and still is thoroughly investigated for its photocatalytic activity and ability for photoelectrochemical water splitting. 5The activity can be enhanced or modified by doping with transition metal or rare earth ions. 6,7 Much is already known on the electronic structure and properties of this compound in its various crystallographic appearances, i.e., rutile-TiO 2 , anatase-TiO 2 , and brookiteTiO 2 . Here we will focus on the anatase-phase. ZnO is an important member of the II-VI semiconductor family. An extensive review on the physical and optical properties of ZnO can be found in Ref. 8. At ambient conditions only the wurtzite phase is thermodynamic stable and all data and schemes in this work will pertain to that phase. SnO 2 has much in common with Zn...

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“…Peaks at 1662 and 3310 cm -1 correspond to bending and stretching vibrations, respectively, for the O-H group of the ethylene glycol molecule, which is used as a capping agent for nanoparticles. [27,[29][30][31][32] However, free O-H has a stretching frequency at 3650 cm -1 . [23] The broad band at 3310 cm -1 therefore indicates the presence of a hydrogen bond in ethylene glycol molecules.…”

Section: Ir and Morphology Studiesmentioning

confidence: 99%

“…The peaks at 2856 and 2927 cm -1 correspond to the stretching vibrations of the CH 2 group of the ethylene glycol molecule, whereas its bending vibration (scissoring) is observed at 1460 cm -1 . [27,[29][30][31][32] The peak at 2362 cm -1 is due to absorption of CO 2 gas from the atmosphere on the surface of particles. The IR study suggests the presence of ethylene glycol along with nanoparticles and thus will help in the incorporation of nanoparticles in polar media.…”

Section: Ir and Morphology Studiesmentioning

confidence: 99%

Luminescence Properties of Redispersible Tb³⁺‐Doped GdPO₄ Nanoparticles Prepared by an Ethylene Glycol Route

et al. 2010

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Nanoparticles of Tb3+ -doped GdPO 4 (Tb 3+ = 0, 2, 5, 7, 10, and 20 atom-%) have been prepared at a relatively low temperature of 160°C in ethylene glycol medium. The particles crystallize in a monoclinic structure with an average crystallite size of 30-50 nm. From the luminescence study of Tb 3+ -doped GdPO 4 , the magnetic dipole transition ( 5 D 4 Ǟ 7 F 5 ) at 545 nm (green) was found to be more prominent than the electric dipole transition ( 5 D 4 Ǟ 7 F 6 ) at 484 nm (blue). Maximum luminescence intensity and lifetime was observed for 7 atom-% Tb 3+. Above 7 atom-% Tb 3+ , a decrease in luminescence was observed. This has been attributed to a con-

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SnO2:Eu nanoparticles dispersed in silica: A low-temperature synthesis and photoluminescence study

Cited by 88 publications

References 29 publications

Observation of intermediate bands in Eu3+ doped YPO4 host: Li+ ion effect and blue to pink light emitter

Observation of intermediate bands in Eu3+ doped YPO4 host: Li+ ion effect and blue to pink light emitter

The Electronic Structure of Lanthanide Impurities in TiO₂, ZnO, SnO₂, and Related Compounds

Luminescence Properties of Redispersible Tb³⁺‐Doped GdPO₄ Nanoparticles Prepared by an Ethylene Glycol Route

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SnO2:Eu nanoparticles dispersed in silica: A low-temperature synthesis and photoluminescence study

Cited by 88 publications

References 29 publications

Observation of intermediate bands in Eu3+ doped YPO4 host: Li+ ion effect and blue to pink light emitter

Observation of intermediate bands in Eu3+ doped YPO4 host: Li+ ion effect and blue to pink light emitter

The Electronic Structure of Lanthanide Impurities in TiO2, ZnO, SnO2, and Related Compounds

Luminescence Properties of Redispersible Tb3+‐Doped GdPO4 Nanoparticles Prepared by an Ethylene Glycol Route

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Product

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The Electronic Structure of Lanthanide Impurities in TiO₂, ZnO, SnO₂, and Related Compounds

Luminescence Properties of Redispersible Tb³⁺‐Doped GdPO₄ Nanoparticles Prepared by an Ethylene Glycol Route