Blue emission of ZrO2:Tm nanocrystals with different crystal structure under UV excitation

Zhang, Hongwu; Fu, Xin; Niu, Shuyun; Xin, Qin

doi:10.1016/j.jnoncrysol.2007.08.064

Cited by 49 publications

(19 citation statements)

References 15 publications

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“…The band at 3.36 eV is due to the cumulative effect of uneven distribution of Zr 4+ at near surface sites, which arise due to the dangling bonds on the surface of the material and due to the radiative recombination of electrones and holes in gadolinium centers. The green emission at 2.24 eV is due to 6 G J to Gd 3+ transition that arise due to stark level manifolds [32][33][34][35][36]. From PL studies it is found that combination of Gd, Mg and Zr resulted in high oxygen vacancy in the material, this made the Gd:MgZrO 3 a robust photocatalyst for the degradation of RhB.…”

Section: Resultsmentioning

confidence: 99%

Solvothermal synthesis of nanoscale disc-like gadolinium doped magnesium zirconate for highly efficient photocatalytic degradation of rhodamine B in water

et al. 2020

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Highly ordered nanoscale disc-like cubic gadolinium doped magnesium zirconate (Gd:MgZrO 3) was synthesized by facile solvothermal route. The reaction time was found to be crucial in determining the final morphology of disc-like Gd:MgZrO 3. After studying the particles from time-dependent experiments, it is observed that, the formation of disc-like particles involved a complex process, in which rod-like or agglomerate particles were favorably formed after the initial thermal treatment. Owing to the chemical instability, they would turn into disc-like particles. After calcination, the generated product possessed good photocatalytic performance for the degradation of Rhodamine B (50 mg l −1) under UV light irradiation in contrast to morphologies of Gd:MgZrO 3 and other related state-of-the-art photocatalysts (e.g., TiO 2 , ZnO, WO 3 , BiVO 4 , Fe 2 O 3 , and g-C 3 N 4). The catalyst could be used for five cycles, maintaining its efficiency above 94.2%. These capacities made the disc-like Gd:MgZrO 3 a potential candidate for polluted water treatment. Also, the underlying photocatalysis mechanism of Gd:MgZrO 3 was proposed through radical trapping experiments.

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Section: Resultsmentioning

confidence: 99%

Solvothermal synthesis of nanoscale disc-like gadolinium doped magnesium zirconate for highly efficient photocatalytic degradation of rhodamine B in water

et al. 2020

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“…Zirconia nanocrystals that contain the rare earth element thulium emit blue fluorescence when exposed to UV light 24) . There are reports of fluorescence from pure zirconia (monoclinic phase) that has been doped with Tm 3+ ions or yttria-rich tetragonal phase-stabilized zirconia 25,26) .…”

Section: Discussionmentioning

confidence: 99%

Fluorescence of thulium-doped translucent zirconia

et al. 2018

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The fluorescence and physical properties of thulium-doped zirconia were investigated. A standard grade of zirconia (TZ-3Y-E) and two translucent dental zirconia materials (Zpex and Zpex Smile) were examined. The specimens were prepared by addition of 0-1.5 wt% TmO and then sintering. When exposed to UV light, the TmO-doped zirconia exhibited blue fluorescence with a peak wavelength of 460 nm. The fluorescence intensity of Zpex and Zpex Smile was higher than that of TZ-3Y-E, with Zpex being more intense than Zpex Smile. Zpex exhibited maximum fluorescence intensity when doped with 0.8 wt% TmO. XRD analysis revealed that TZ-3Y-E and Zpex contained primarily tetragonal zirconia, while Zpex Smile contained largely cubic phase zirconia. There were no changes observed in the microstructure or physical properties of the zirconia specimens when doped with TmO.

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“…This phenomenon can be also explained by the quenching concentration phenomenon of the emission. Indeed, the increase of rare earth activator concentration induces the shortening of the RE 3+ -RE 3+ distance, and it is well known that if the distance of luminescent centers is short enough, energy can transfer among these luminescent centers following a great deal of nonradiative transitions, which leads to the quenching of luminescence [26]. In the other hand, the concentration behaviour of the luminescence is a complex matter, since different energy transfers (mainly cross relaxation) can be involved and several experimental parameters are involved.…”

Section: Photoluminescencementioning

confidence: 99%

Optical Properties of Blue Phosphor

Derbal

Guerbous

Ouadjaout

et al. 2009

Advances in Condensed Matter Physics

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LiIn 1−x Tm x (WO 4 ) 2 (x = 0, 0.5, 1, 5, and 10 at.%) polycrystalline powders blue phosphors were prepared via the classical solid-state reaction method. X-ray diffraction (XRD), scanning electron microscope (SEM), photoluminescence excitation, and emission spectra were used to characterize LiIn 1−x Tm x (WO 4 ) 2 phosphors. By analyzing the excitation and emission spectra of LiIn 1−x Tm x (WO 4 ) 2 samples, the result indicates that there exists the energy transfer only from the WO 2− 4 group to the 1 G 4 energy level of Tm 3+ ion. On the other hand, the influence of the thulium concentration on the blue emission transition 1 D 2 → 3 F 4 and 1 G 4 → 3 H 6 and the emission of WO 2− 4 group are investigated.

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Blue emission of ZrO2:Tm nanocrystals with different crystal structure under UV excitation

Cited by 49 publications

References 15 publications

Solvothermal synthesis of nanoscale disc-like gadolinium doped magnesium zirconate for highly efficient photocatalytic degradation of rhodamine B in water

Solvothermal synthesis of nanoscale disc-like gadolinium doped magnesium zirconate for highly efficient photocatalytic degradation of rhodamine B in water

Fluorescence of thulium-doped translucent zirconia

Optical Properties of Blue Phosphor

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