Photoluminescence of Eu-doped TiO2 thin films prepared by low pressure hot target magnetron sputtering

Prociów, E.; Domaradzki, J.; Podhorodecki, A.; Borkowska, A.; Kaczmarek, Danuta; Misiewicz, J.

doi:10.1016/j.tsf.2006.11.082

Cited by 41 publications

(19 citation statements)

References 8 publications

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“…Our previous work [15,16] has shown that by introducing different dopants, e.g. Hf, Pd, V, Co into the TiO 2 matrix, it is possible to obtain different electrical properties of prepared thin films: from an insulator (e.g.…”

Section: Introductionmentioning

confidence: 99%

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Optical and electrical properties of nanocrystalline TiO2:Pd semiconducting oxides

et al. 2011

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Abstract:Electrical and optical properties of TiO 2 :Pd thin films deposited from Ti-Pd mosaic targets sputtered in reactive oxygen plasma have been studied. The properties were investigated for thin films with the Pd amount of 5.5 at. %, 8.4 at. % and 23 at. %. Based on resistivity measurements a drop from 10 3 down to almost 10 −3 Ωcm has been recorded when the Pd amount was varied from 5.5 at. % to 23 at. %, respectively. Moreover, it was shown that doping with different amounts of Pd results in the possibility of obtaining both types of electrical conduction: n-type for the TiO 2 with 5.5 at. % and 8.4 at. % of Pd and ptype for the TiO 2 with 23 at. % of Pd thin films. From optical measurements it has been found that as the Pd amount was increased the transmission through the thin films was reduced and position of the fundamental absorption edge was shifted toward a longer wavelength range of up to 600 nm. The optical band gap was calculated for direct and indirect transitions from optical absorption spectra. Structural properties were characterized by X-ray diffraction (XRD) and atomic force microscopy (AFM). The XRD patterns displayed occurrence of the crystalline, TiO 2 -rutile for lower Pd amounts (5.5 at. %, 8.4 at. %), while the TiO 2 :Pd (23 at. %) thin films displayed XRD-amorphous behaviour. Images obtained from AFM displayed dense, nanocrystalline structure with homogenous distribution of crystallites. Additionally performed secondary ion mass spectroscopy investigation confirmed homogenous distribution of Pd in the whole thickness of the prepared thin films. PACS

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Section: Introductionmentioning

confidence: 99%

“…TiO 2 (V,Pd) [16]). Moreover, doping with rare earth elements, like Eu, makes prepared thin films optically active [15].…”

Section: Introductionmentioning

confidence: 99%

Optical and electrical properties of nanocrystalline TiO2:Pd semiconducting oxides

et al. 2011

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“…Plasma processes with the pressure lower than 10 −1 Pa are called low pressure sputtering [3,8,[17][18][19]. The main advantage of low pressure is longer mean free path that allows oxygen ions to bombard the surface with higher energy.…”

Section: Methodsmentioning

confidence: 99%

Study of Structure Densification in TiO₂Coatings Prepared by Magnetron Sputtering under Low Pressure of Oxygen Plasma Discharge

et al. 2011

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Current work presents results of studies on structural and optical properties of the TiO2 thin films prepared by reactive magnetron sputtering. Oxide thin films were deposited from metallic targets using oxygen gas only instead of usually used mixture of Ar-O2. Additionally, an increased amplitude of unipolar pulses powering the magnetron has been applied. It is shown that all prepared coatings were stoichiometric and by changing only the discharge voltage it is possible to influence the resulting structural phase and optical properties of prepared thin films. Depending on conditions of magnetron powering, TiO2 thin films had either the anatase structure with refraction index n = 2.1 (λ = 500 nm) or a high temperature stable rutile structure with n = 2.52 (λ = 500 nm).

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“…[1 -4] Among RE-doped compounds, the titania doped with europium (Eu) is characterised by excellent luminescent properties, [5] therefore, it can be used as a light-emitting material in the visible and near-infrared range for many technological applications. [6] RE-doped titania nanopowders and thin films, prepared by several techniques, such as hydrothermal procedures, [2] solvothermal techniques, [7] sol-gel methodologies [6] and lowpressure hot-target magnetron sputtering [1] have been extensively examined. However, RE-doped TiO 2 nanofibres, fabricated by electrospinning, have been rarely investigated.…”

Section: Introductionmentioning

confidence: 99%

Structure and composition of electrospun titania nanofibres doped with Eu

Mezzi

Kačiulis

Cacciotti

et al. 2010

Surface & Interface Analysis

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Electrospinning technique was used to prepare the nanofibres of pure and Europium (Eu)-doped titania with Eu content of 3-10%mol. The solution was electrospun in air at room temperature. The obtained fibrous mats were thermally treated at 500 or 1000• C. Morphology and phase analyses of the resulting fibrous ceramic mats were carried out by using SEM and X-ray diffraction (XRD), while the surface chemical composition was investigated by XPS. Annealed mats consisted of randomly oriented fibres with fairly uniform and nanometric diameter, dependent on the doping level. The main titania phase in the samples, heated at 500• C, was anatase, whereas rutile phase with small traces of Eu 2 Ti 2 O 7 were identified in the samples calcined at 1000 • C. From the XPS analysis, it was determined that all the samples were composed of Ti 4+ and Eu 3+ species. XPS quantification of annealed samples revealed a surface enrichment with Eu. XPS depth profiles demonstrated that the chemical composition of the samples was constant. Moreover, it was observed that the Ti 4+ reduction, induced by ion sputtering, decreased in the samples with higher concentration of Eu dopant.

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Photoluminescence of Eu-doped TiO2 thin films prepared by low pressure hot target magnetron sputtering

Cited by 41 publications

References 8 publications

Optical and electrical properties of nanocrystalline TiO2:Pd semiconducting oxides

Optical and electrical properties of nanocrystalline TiO2:Pd semiconducting oxides

Study of Structure Densification in TiO₂Coatings Prepared by Magnetron Sputtering under Low Pressure of Oxygen Plasma Discharge

Structure and composition of electrospun titania nanofibres doped with Eu

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Photoluminescence of Eu-doped TiO2 thin films prepared by low pressure hot target magnetron sputtering

Cited by 41 publications

References 8 publications

Optical and electrical properties of nanocrystalline TiO2:Pd semiconducting oxides

Optical and electrical properties of nanocrystalline TiO2:Pd semiconducting oxides

Study of Structure Densification in TiO2Coatings Prepared by Magnetron Sputtering under Low Pressure of Oxygen Plasma Discharge

Structure and composition of electrospun titania nanofibres doped with Eu

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Study of Structure Densification in TiO₂Coatings Prepared by Magnetron Sputtering under Low Pressure of Oxygen Plasma Discharge