Preparation and optical properties of Eu 3+ doped and Er 3+ /Yb 3+ codoped oxyfluoride glass ceramics containing Ba 1−x Lu x F 2+x nanocrystals

Fei, Yong; Zhao, Shilong; Sun, Xiao Wei; Huang, Lihui; Deng, Degang; Xu, Shiqing

doi:10.1016/j.jnoncrysol.2015.08.004

Cited by 19 publications

(7 citation statements)

References 22 publications

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“…The size of BaF 2 nanocrystals is consistent with average crystal size estimated from Scherrer equation. To compare, the annealing conditions and sizes of BaF 2 :Eu 3+ nanocrystals in another glass-ceramics presented in literature were shown in Table 1 [25,26,27,28,29]. The similar crystal size was identified for sol-gel glass-ceramic materials (95SiO 2 -5BaF 2 ): 1% Eu 3+ (mol %) obtained during controlled heat-treatment at 800 °C per 1 h [25] as well as for conventional glasses with composition of 68SiO 2 -15BaF 2 -13K 2 CO 3 -2.75La 2 O 3 -1Sb 2 O 3 -0.25Eu 2 O 3 (mol %) during annealing at 600 °C per 24 h (6–10 nm) [26].…”

Section: Resultsmentioning

confidence: 99%

Reddish-Orange Luminescence from BaF2:Eu3+ Fluoride Nanocrystals Dispersed in Sol-Gel Materials

et al. 2019

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Nanocrystalline transparent BaF2:Eu3+ glass-ceramic materials emitting reddish-orange light were fabricated using a low-temperature sol-gel method. Several experimental techniques were used to verify structural transformation from precursor xerogels to sol-gel glass-ceramic materials containing fluoride nanocrystals. Thermal degradation of xerogels was analyzed by thermogravimetric analysis (TG) and differential scanning calorimetry method (DSC). The presence of BaF2 nanocrystals dispersed in sol-gel materials was confirmed by the X-ray diffraction (XRD) analysis and transmission electron microscopy (TEM). In order to detect structural changes in silica network during annealing process, the infrared spectroscopy (IR-ATR) was carried out. In particular, luminescence spectra of Eu3+ and their decays were examined in detail. Some spectroscopic parameters of Eu3+ ions in glass-ceramics containing BaF2 nanocrystals were determined and compared to the values obtained for precursor xerogels. It was observed, that the intensities of two main red and orange emission bands corresponding to the 5D0→7F2 electric-dipole transition (ED) and the 5D0→7F1 magnetic-dipole (MD) transition are changed significantly during transformation from xerogels to nanocrystalline BaF2:Eu3+ glass-ceramic materials. The luminescence decay analysis clearly indicates that the measured lifetime 5D0 (Eu3+) considerably enhanced in nanocrystalline BaF2:Eu3+ glass-ceramic materials compared to precursor xerogels. The evident changes in luminescence spectra and their decays suggest the successful migration of Eu3+ ions from amorphous silica network to low-phonon BaF2 nanocrystals.

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Section: Resultsmentioning

confidence: 99%

Reddish-Orange Luminescence from BaF2:Eu3+ Fluoride Nanocrystals Dispersed in Sol-Gel Materials

et al. 2019

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“…BaF 2 -REF 3 compounds have been extensively studied as nanocrystals in various oxyfluoride glass ceramics. Efficient UCL processes in glass ceramics containing fluorite type phases such as Ba 2 LaF 7 [24], BaYF 5 [25], BaYbF 5 [26] and Ba 1−x Lu x F 2+x [27]. Oxyfluoride glass ceramics are excellent candidates for applications in which transparency is required.…”

Section: Introductionmentioning

confidence: 99%

Phase transitions and upconversion luminescence in oxyfluoride glass ceramics containing Ba4Gd3F17 nanocrystals

Krieķe

Šarakovskis

Ignatāns

et al. 2017

Journal of the European Ceramic Society

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Novel transparent Er3+ doped oxyfluoride glass-ceramics containing Ba4Gd3F17 nanocrystals were prepared by melt quenching followed by heat treatment of as-prepared glasses. The phase composition and microstructure were investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). Intense upconversion luminescence (UCL) was detected. Longer characteristic decay times and splitting of the luminescence bands compared to the precursor glass indicated the incorporation of erbium ions in the crystalline phase. The spectroscopic properties of glass ceramics were compared with single phase cubic and rhombohedral Ba4Gd3F17 ceramics. The unit cell parameters and atomic positions in the rhombohedral phase were calculated using Rietveld refinement. The local environment of Er3+ and the phonon energy of both polymorphs were analyzed using luminescence and Raman spectroscopy. In the glass ceramics, a phase transition from distorted metastable fluorite to ordered rhombohedral Ba4Gd3F17 was observed and resulted in the enhancement of the efficiency of UCL.

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“…Additionally, the hydro(solvo)-thermal method is more suitable to prepare highly crystalline uorides nanomaterials under relatively mild condition. 28,[42][43][44] Compared with the traditional high temperature solid state reaction route, the hydrothermal synthesis of UC uorides has the advantage of controlled morphology and size, but it loses the high emission efficiency due to the high concentration defects and OH À . In the past decade, many approaches have been reported to increase the UC emission efficiency of lanthanide-doped nanoparticles, for example, using noble metal nanocrystal plasma, 45 photonic crystal effect, 46 surface coating through core-shell structure 47 and ion-exchange modi-ed hydrothermal method.…”

Section: Introductionmentioning

confidence: 99%

Hydrothermal synthesis of Ba₃Sc₂F₁₂:Yb³⁺, Ln³⁺ (Ln = Er, Ho, Tm) crystals and their up conversion white light emission

Wang

et al. 2017

RSC Adv.

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Preparation and optical properties of Eu 3+ doped and Er 3+ /Yb 3+ codoped oxyfluoride glass ceramics containing Ba 1−x Lu x F 2+x nanocrystals

Cited by 19 publications

References 22 publications

Reddish-Orange Luminescence from BaF2:Eu3+ Fluoride Nanocrystals Dispersed in Sol-Gel Materials

Reddish-Orange Luminescence from BaF2:Eu3+ Fluoride Nanocrystals Dispersed in Sol-Gel Materials

Phase transitions and upconversion luminescence in oxyfluoride glass ceramics containing Ba4Gd3F17 nanocrystals

Hydrothermal synthesis of Ba₃Sc₂F₁₂:Yb³⁺, Ln³⁺ (Ln = Er, Ho, Tm) crystals and their up conversion white light emission

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Preparation and optical properties of Eu 3+ doped and Er 3+ /Yb 3+ codoped oxyfluoride glass ceramics containing Ba 1−x Lu x F 2+x nanocrystals

Cited by 19 publications

References 22 publications

Reddish-Orange Luminescence from BaF2:Eu3+ Fluoride Nanocrystals Dispersed in Sol-Gel Materials

Reddish-Orange Luminescence from BaF2:Eu3+ Fluoride Nanocrystals Dispersed in Sol-Gel Materials

Phase transitions and upconversion luminescence in oxyfluoride glass ceramics containing Ba4Gd3F17 nanocrystals

Hydrothermal synthesis of Ba3Sc2F12:Yb3+, Ln3+ (Ln = Er, Ho, Tm) crystals and their up conversion white light emission

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Hydrothermal synthesis of Ba₃Sc₂F₁₂:Yb³⁺, Ln³⁺ (Ln = Er, Ho, Tm) crystals and their up conversion white light emission