Color tunability of the upconversion emission in Er–Yb doped the wide band gap nanophosphors ZrO2 and Y2O3

Meza, O.; Dı́az-Torres, L.A.; Salas, P.; Rosa, E. De la; Solís, David

doi:10.1016/j.mseb.2010.03.015

Cited by 48 publications

(16 citation statements)

References 19 publications

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“…In accordance to the literature, the following oxides have been investigated up to now: Y 2 O 3 ,Gd 2 O 3 , Lu 2 O 3 , ZrO 2 and TiO 2 [9][10][11][12][13]. In particular, rare-earth sesquioxides are well recognized because of their excellent chemical stability, good thermal conductivity and high light output.…”

Section: Introductionmentioning

confidence: 87%

Structural, morphological and luminescence properties of nanocrystalline up-converting Y1.89Yb0.1Er0.01O3 phosphor particles synthesized through aerosol route

Lojpur

Mančić

Rabanal

et al. 2013

Journal of Alloys and Compounds

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Nanocrystalline up-converting Y 2 O 3 :Yb 3+ ,Er 3+ phosphor particles were processed in a dispersed system-aerosol, generated ultrasonically at 1.3 MHz from common nitrate precursor solution having fixed ytter-bium-to-erbium concentration ratio. The appropriate process parameters: residence time 21 s, carrier gas (air) flow rate 1.6 dm 3 /min, synthesis temperature 900 °C, led to the formation of unagglomerated spherical nanostructured secondary particles, having mean particle size of approx 450 nm, composed of primary nanoscaled (20 nm) subunits. In order to reach targeting phase crystallinity, the asprepared particles were additionally annealed at 1100 °C in air for 12, 24 and 48 h, respectively. Particle structure, morphology and purity were analyzed by X-ray powder diffraction (XRPD), scanning electron microscopy (FESEM/SEM), analytical and high resolution transmission electron microscopy (TEM/HRTEM) in combi-nation with energy dispersive X-ray analysis and Fourier Transform Infrared Spectroscopy (FTIR). All samples crystallized in a cubic bixbyte-structure, space group Ia-3. The crystallite size changed with annealing time from 30 nm in as-prepared sample to 135 nm in sample annealed for 48 h, respectively. Emission spectra were assigned to the following trivalent erbium f-f electronic transitions: 2 H 9/2 ? 4 I 15/2 (blue: 407-420 nm), ( 2 H 11/2 , 4 S 3/2 ) ? 4 I 15/2 (green: 510-590 nm), and 4 F 9/2 ? 4 I 15/2 (red: 640-720 nm). The significant improvement of the emission decay times were observed after thermal treatment and this effect is correlated further with the structural and morphological particles characteristics. For the anneal-ing time of 12 h a quite high emission decay times were achieved (blue: 0.14 ms, green: 0.32 ms and red: 0.39 ms).

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Section: Introductionmentioning

confidence: 87%

Structural, morphological and luminescence properties of nanocrystalline up-converting Y1.89Yb0.1Er0.01O3 phosphor particles synthesized through aerosol route

Lojpur

Mančić

Rabanal

et al. 2013

Journal of Alloys and Compounds

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“…In the past decade, attention has been paid to the development of third generation visible-light-active photocatalysts based on ZrO 2 due to its suitable flat band potentials for many reduction and oxidation reactions, low cost and high thermal and chemical stability (Ni et al, 2007 ). For instance, rare earth metals [e.g., Ce, (Gnanamoorthi et al, 2015 ), Er, Yb (Meza et al, 2010 ), Y, Eu, Sm and Tb (Bugrov et al, 2016 )] have been employed to modify the microstructural and optical properties of ZrO 2 . Moreover, ZrO 2 powders doped with metals, i.e.…”

Section: Introductionmentioning

confidence: 99%

Insights Into the Sunlight-Driven Water Oxidation by Ce and Er-Doped ZrO2

et al. 2018

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In the present work, the activity of Ce and Er-doped ZrO2 nanopowders for sun-driven photocatalytic water oxidation has been investigated. ZrO2 powders with tunable amounts of tetragonal, monoclinic and cubic polymorphs have been synthesized by introducing Ce and Er (from 0.5 to 10 mol % on an oxide basis) through hydrothermal method. The aim of this work is to investigate the role of rare earth (RE) ions rich of electrons (Er3+) and with entirely empty levels (Ce4+) in the ZrO2 matrix for the sun-driven photocatalytic water oxidation reaction. The samples have been characterized by means of UV-Vis spectroscopy, X-Ray diffraction (XRD), N2 adsorption, X-ray photoelectron spectrophotometry (XPS) and transmission electronic microscopy (TEM) with energy dispersive spectroscopy (EDS). With respect to the bare ZrO2 mainly containing monoclinic (m-) phase, an increasing amount of rare-earth (RE) dopant was found to improve the specific BET surface area and to stabilize the tetragonal (t-) or cubic (c-) polymorphs of ZrO2 at room temperature. XRD data confirmed that dopants were mainly inserted in the t-ZrO2 phase. The photocatalytic O2 evolution from water under AM 1.5 G simulated sunlight illumination of the prepared samples have been correlated with their optical, structural and chemical properties. The effect of the dopant concentration on the chemical-physical and photocatalytic properties of the Er- and Ce-doped ZrO2 materials was elucidated. The samples with 5% of RE oxide were the most active, i.e., three times more than pure zirconia. Their superior photocatalytic activity was found to be mainly correlated to two factors: (i) an optimal surface concentration of RE ions of about 3.7%, which increased charge carriers separation in the photocatalysts surface due more superficial defects of the t-ZrO2 and a higher surface area, thus enhancing the reaction kinetics, (ii) a controlled amount of monoclinic vs. tetragonal (or cubic) polymorphs of zirconia with an optimum ratio of about 70/30 of t-ZrO2/m-ZrO2. Instead, the increased ability of the RE-doped ZrO2 to harvest visible light was found to have a secondary role on the photocatalytic activity of the Ce-doped ZrO2 material.

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“…Rare earth element doped up-conversion luminescent materials have many advantages [10][11][12][13][14][15][16][17][18], including higher chemical stability, lower potential toxicity, and longer fluorescence lifetime. In particular, due to the nearinfrared emitting property, the emitting light of these materials has larger optical penetration depth, lower generation of autofluorescence and almost no damage in biological tissue [19][20][21][22].…”

Section: Introductionmentioning

confidence: 99%

Er 3+ /Yb 3+ co-doped bioactive glasses with up-conversion luminescence prepared by containerless processing

Xing

Chen

et al. 2016

Ceramics International

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Color tunability of the upconversion emission in Er–Yb doped the wide band gap nanophosphors ZrO2 and Y2O3

Cited by 48 publications

References 19 publications

Structural, morphological and luminescence properties of nanocrystalline up-converting Y1.89Yb0.1Er0.01O3 phosphor particles synthesized through aerosol route

Structural, morphological and luminescence properties of nanocrystalline up-converting Y1.89Yb0.1Er0.01O3 phosphor particles synthesized through aerosol route

Insights Into the Sunlight-Driven Water Oxidation by Ce and Er-Doped ZrO2

Er 3+ /Yb 3+ co-doped bioactive glasses with up-conversion luminescence prepared by containerless processing

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