Up-conversion fluorescence spectroscopy in Er3+: TiO2 planar waveguides prepared by a sol-gel process

Bahtat, A.; Bouazaoui, M.; Bahtat, M.; Garapon, C.; Jacquier, B.; Mugnier, J.

doi:10.1016/0022-3093(96)00172-x

Cited by 94 publications

(47 citation statements)

References 12 publications

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“…TiO 2 Sol-Solution Preparation: The titania thin films were prepared via a method described by Bahtat et al [29]. This initially involved rapidly adding glacial acetic acid (2.65 mL, 46 mol) to titanium tetrai-propoxide (Ti(i-PrOH) 4 , 97%, 2.35 mL, 7.7 mmol) under vigorous stirring.…”

Section: Methodsmentioning

confidence: 99%

Sol-Gel Based Vertical Optical Microcavities with Quantum Dot Defect Layers

et al. 2008

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The interaction between CdSe-CdS-ZnS semiconductor quantum dot emitters (QDs) and sol–gel based asymmetric Bragg microcavities is studied. It is found that the quality factor (Q) of such microcavities is limited by interlayer diffusion. This results in maximum Q values of less than 100. Despite this, these structures still exhibit optical signatures characteristic of the Purcell effect, where large modifications to the photoluminescence properties of QDs are observed

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Section: Methodsmentioning

confidence: 99%

Sol-Gel Based Vertical Optical Microcavities with Quantum Dot Defect Layers

et al. 2008

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“…[109] Prasad et al [26] reported the effect of crystal phase on the upconverted emission of Er 3 + in TiO 2 nanocrystals, be- cause different crystal phases, that is, anatase and rutile, appear at 700 and 1000 8C, respectively (Figure 9 b). Bahtat et al [110] reported UC fluorescence (blue, green, and red) in Er 3 +…”

Section: How Do the Crystal Phases Tune Uc Emission?mentioning

confidence: 97%

Lanthanide‐Doped Nanocrystals: Strategies for Improving the Efficiency of Upconversion Emission and Their Physical Understanding

2014

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The fundamental understanding of lanthanide-doped upconverted nanocrystals remains a frontier area of research because of potential applications in photonics and biophotonics. Recent studies have revealed that upconversion luminescence dynamics depend on host crystal structure, size of the nanocrystals, dopant concentration, and core-shell structures, which influence site symmetry and the distribution and energy migration of the dopant ions. In this review, we bring to light the influences of doping/co-doping concentration, crystal phase, crystal size of the host, and core-shell structure on the efficiency of upconversion emission. Furthermore, the lattice strain, due to a change in the crystal phase and by the core-shell structure, strongly influences the upconversion emission intensity. Analysis suggests that the local environment of the ion plays the most significant role in modification of radiative and nonradiative relaxation mechanisms of overall upconversion emission properties. Finally, an outlook on the prospects of this research field is given.

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“…The direct and indirect band gap energies depend on the size of the particle, approximately following the well-known E g versus R -2 linear dependence. Photoacoustic spectra evidence the 4 …”

Section: Discussionmentioning

confidence: 98%

“…Applications range from gas and/or humidity sensor, catalyst, optical coatings, to photovoltaic cells and rechargeable batteries, among many other [1][2][3][4][5]. To improve its optical performance, dye sensitization of TiO 2 has been performed towards a more efficient harvesting of optical energy, by absorbing light within a wider electromagnetic range [6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Photo-acoustic properties of nanoTiO2:Er

Palomino-Merino

Lozada‐Morales²,

Martínez-Juárez³

et al. 2016

IJBAS

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Nanocrystalline Er-doped TiO2 was prepared by sol-gel at room temperature. X-ray diffraction, photoacoustic spectroscopy (optical absorption), transmission electron microscopy (TEM), and electron dispersion microscopy (EDS) were carried out on both as-prepared and thermally-annealed (air at 700 ºC) samples, revealing the anatase crystalline phase of TiO2. The samples exhibit an average grain size from 38 to 5.1 nm, as the nominal concentration of Er varies from 0 % to 7 %. The photoacoustic spectra evidence the absorption edge at 300 nm attributed to TiO2, as well as several electronic transitions which are atomic energy absorption-line levels characteristics of Er.

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Up-conversion fluorescence spectroscopy in Er3+: TiO2 planar waveguides prepared by a sol-gel process

Cited by 94 publications

References 12 publications

Sol-Gel Based Vertical Optical Microcavities with Quantum Dot Defect Layers

Sol-Gel Based Vertical Optical Microcavities with Quantum Dot Defect Layers

Lanthanide‐Doped Nanocrystals: Strategies for Improving the Efficiency of Upconversion Emission and Their Physical Understanding

Photo-acoustic properties of nanoTiO2:Er

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