Improvement in upconversion/downshifting luminescence of Gd2O3 :Ho3+/Yb3+ phosphor through Ca2+ / Zn2+ incorporation and optical thermometry studies

Kumar, Abhishek; Silva, Joaquim C. G. Esteves da; Kumar, Kaushal; Swart, H.C.; Maurya, S. K.; Kumar, Promod; Tiwari, S.P.

doi:10.1016/j.materresbull.2018.11.031

Cited by 43 publications

(13 citation statements)

References 43 publications

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“…43-1014. 23 No diffraction peaks of any impurity were observed, indicating the high purity of the final products. These results suggest that the precursor samples crystallized into their analogous oxide nanoparticles at a heating temperature of 700 °C.…”

Section: Resultsmentioning

confidence: 99%

Novel lanthanide(III) 4-methylbenzoylhydrazide complexes as precursors for lanthanide oxide nanophotocatalysts

et al. 2019

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Section: Resultsmentioning

confidence: 99%

Novel lanthanide(III) 4-methylbenzoylhydrazide complexes as precursors for lanthanide oxide nanophotocatalysts

et al. 2019

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“…The survey spectrum of GIZO is shown in Figure 3A, authenticating the presence of respective elements. Figure 3B shows the Gd 3d 3/2 and Gd 3d 5/2 signals appearing in Gd 3d XPS spectrum with a spin‐orbit splitting around 32.2 eV, which affirms their 3 + characteristics 17 . The associated satellite peaks additionally approve the existence of Gd 2 O 3 phase in GIZO.…”

Section: Methodsmentioning

confidence: 55%

Highly efficient overall water splitting performance of gadolinium‐indium‐zinc ternary oxide nanostructured electrocatalyst

et al. 2020

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Summary Metal oxide nanostructures gain specific interest for bifunctional electrocatalytic functions in efficient water splitting reactions. From this perspective, Gd‐In‐Zn‐based ternary oxides were solution processed and studied for oxygen and hydrogen evolution activities under different pH alkaline media. The nanostructure morphology was ascertained using high‐power analytical tools such as scanning and transmission electron microscopes. Signals obtained from X‐ray diffraction data revealed the prevalence of Gd2O3 phase in ternary oxide. Valence state of Gd, In, and Zn ions and their oxide traits was examined using X‐ray photoelectron spectroscopy. Ternary oxides of Gd‐In‐Zn showcased their overall potential for water splitting applications. Overpotential (η) for oxygen and hydrogen (OER/HER) evolution reactions was recorded to be 282 and 271 mV for ±10 mA/cm2. The results demonstrated the processed oxide as an effective OER/HER electrocatalyst with profound Tafel slopes (121/64 mV/dec for OER/HER) and excellent long‐term stability.

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“…5a, b, and c, separately. The Gd 3d core level spectra shows two peaks at about 1185.7 and 1217.3 eV related to Gd 3d 5/2 and Gd 3d 3/2, individually, affirming the presence of Gd 3+ ions (Kumar et al 2019). Similarly, the Ti 2p range comprises of two peaks at about 458 and 464 eV signifying the Ti 4+ octahedral state of oxide structure (Logar et al 2014).…”

Section: Depiction Of Gd 2 O 3 -Tio 2 Nanocompositesmentioning

confidence: 81%

Photocatalytic visible-light-driven removal of the herbicide imazapyer using nanocomposites based on mesoporous TiO2 modified with Gd2O3

et al. 2020

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In this work, mesoporous Gd 2 O 3 -TiO 2 nanocomposites synthetized by a sol-gel with vary Gd 2 O 3 concentration were investigated for photo-destruction of imazapyr herbicide waste. Textural, structural and surface properties of the synthetized nanocomposites are verified by N 2 physisorption, X-ray diffractometry, HRTEM and various spectroscopic techniques (FTIR, DRS UV-Vis, Raman, PL and XPS). HRTEM micrographs of the calcined Gd 2 O 3 -TiO 2 revealed the existence of a mesoporous matrix consisting of homogeneously distributed TiO 2 nanoparticles (NPs, 12 nm) which are decorated with Ga 2 O 3 nanoparticles. It was found a reverse correlation between the amount of Gd 2 O 3 concentration and the TiO 2 nanoparticle size: the formation of smaller TiO 2 nanoparticles was favored by the use of high Gd 2 O 3 concentration. The photocatalytic efficiency of the synthetized Gd 2 O 3 -TiO 2 nanocomposites was appraised in the photo-destruction of imazapyr herbicide below visible-light irradiation. The best herbicide destruction was achieved using 3%Gd 2 O 3 -TiO 2 photocatalyst and degraded the imazapyr herbicide 20.5 and 8.2 times faster than a commercial P25 and non-promoted TiO 2 , respectively, indicating that modification of TiO 2 with Gd 2 O 3 led to a significant improvement of photocatalyst efficiency. This was explained as due to a lessening of the apparent optical bandgap and the formation of a large amount of surface defect states favoring the separation between electrons and holes. Besides its high efficiency, the 3%Gd 2 O 3 -TiO 2 photocatalyst demonstrated to be recyclable and stable in the visible-light-driven photocatalytic destruction of imazapyr herbicide.

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Improvement in upconversion/downshifting luminescence of Gd2O3 :Ho3+/Yb3+ phosphor through Ca2+ / Zn2+ incorporation and optical thermometry studies

Cited by 43 publications

References 43 publications

Novel lanthanide(III) 4-methylbenzoylhydrazide complexes as precursors for lanthanide oxide nanophotocatalysts

Novel lanthanide(III) 4-methylbenzoylhydrazide complexes as precursors for lanthanide oxide nanophotocatalysts

Highly efficient overall water splitting performance of gadolinium‐indium‐zinc ternary oxide nanostructured electrocatalyst

Photocatalytic visible-light-driven removal of the herbicide imazapyer using nanocomposites based on mesoporous TiO2 modified with Gd2O3

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