Long-lasting luminescent ZnGa2O4:Cr3+transparent glass-ceramics

Chenu, Sébastien; Véron, Emmanuel; Genevois, Cécile; Garcia, Alain; Matzen, Guy; Allix, Mathieu

doi:10.1039/c4tc02081b

Cited by 75 publications

(70 citation statements)

References 41 publications

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“…1) is typical of a strong volume crystallization mechanism. The ceramic microstructure appears quite similar to the one observed in glass-ceramics elaborated from a nanometer-scale phase separated glass (spinodal decomposition) 50 . We stipulate that the high cooling rate from the melt prevents phase separation to take place during glass forming but we cannot exclude that nanoscale phase separation may occur upon crystallization heat treatment, which would explain the high nucleation rate and the observed nanostructure.…”

Section: Resultssupporting

confidence: 62%

Pressureless glass crystallization of transparent yttrium aluminum garnet-based nanoceramics

et al. 2018

Nat Commun

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152

115

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Transparent crystalline yttrium aluminum garnet (YAG; Y3Al5O12) is a dominant host material used in phosphors, scintillators, and solid state lasers. However, YAG single crystals and transparent ceramics face several technological limitations including complex, time-consuming, and costly synthetic approaches. Here we report facile elaboration of transparent YAG-based ceramics by pressureless nano-crystallization of Y2O3–Al2O3 bulk glasses. The resulting ceramics present a nanostructuration composed of YAG nanocrystals (77 wt%) separated by small Al2O3 crystalline domains (23 wt%). The hardness of these YAG-Al2O3 nanoceramics is 10% higher than that of YAG single crystals. When doped by Ce3+, the YAG-Al2O3 ceramics show a 87.5% quantum efficiency. The combination of these mechanical and optical properties, coupled with their simple, economical, and innovative preparation method, could drive the development of technologically relevant materials with potential applications in wide optical fields such as scintillators, lenses, gem stones, and phosphor converters in high-power white-light LED and laser diode.

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Section: Resultssupporting

confidence: 62%

Pressureless glass crystallization of transparent yttrium aluminum garnet-based nanoceramics

et al. 2018

Nat Commun

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152

115

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“…Typical examples are transparent ceramics of Cr

^{3 +}

or Ce

^{3 +}

activated garnets [24,25,26], (glass-)ceramics of SrAl

_{2}

_{4}

:Eu

^{2 +}

, Dy

^{3 +}

[27,28,29], near-infrared-emitting ZnGa

_{2}

_{4}

:Cr

^{3 +}

[30,31] and other oxide phosphors [10,32,33]. The luminance or radiance decay curve of a thick ceramic sample will remain above a pre-defined threshold for a much longer time than for a powder sample with a comparable storage capacity and trap depth distribution, making an objective comparison between powder and ceramic samples impossible unless the amount of excited phosphor material is well-controlled.…”

Section: Introductionmentioning

confidence: 99%

Counting the Photons: Determining the Absolute Storage Capacity of Persistent Phosphors

et al. 2017

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The performance of a persistent phosphor is often determined by comparing luminance decay curves, expressed in cd/m2. However, these photometric units do not enable a straightforward, objective comparison between different phosphors in terms of the total number of emitted photons, as these units are dependent on the emission spectrum of the phosphor. This may lead to incorrect conclusions regarding the storage capacity of the phosphor. An alternative and convenient technique of characterizing the performance of a phosphor was developed on the basis of the absolute storage capacity of phosphors. In this technique, the phosphor is incorporated in a transparent polymer and the measured afterglow is converted into an absolute number of emitted photons, effectively quantifying the amount of energy that can be stored in the material. This method was applied to the benchmark phosphor SrAl2O4:Eu,Dy and to the nano-sized phosphor CaS:Eu. The results indicated that only a fraction of the Eu ions (around 1.6% in the case of SrAl2O4:Eu,Dy) participated in the energy storage process, which is in line with earlier reports based on X-ray absorption spectroscopy. These findings imply that there is still a significant margin for improving the storage capacity of persistent phosphors.

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“…Selective doping of Ni 2+ in Zn 1+ x Ga 2−2 x Ge x O 4 nanocrystals embedded in GCs has been reported; however, the NIR luminescence properties were not clearly identified in this case 22 . To date the authors of this article are not aware of any study relating to the luminescence properties of ZnGa 2 O 4 : Ni 2+ GCs, although GCs containing ZnGa 2 O 4 : Cr 3+ nanocrystals, showing persistent luminescence and temperature sensing properties, have recently been extensively studied 12, 23 .…”

Section: Introductionmentioning

confidence: 99%

Selective doping of Ni2+ in highly transparent glass-ceramics containing nano-spinels ZnGa2O4 and Zn1+x Ga2−2x Ge x O4 for broadband near-infrared fiber amplifiers

Gao

Liu

Ren

et al. 2017

Sci Rep

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Selective doping of Ni2+ in octahedral sites provided by nanocrystals embedded in glass-ceramics (GCs) is crucial to the enhancement of broadband near-infrared (NIR) emission. In this work, a NIR emission with a full-width-at-half-maximum (FWHM) of 288 nm is first reported from ZnGa2O4: Ni2+ nano-spinels embedded GCs with excellent transparency. A comparison is made of the NIR luminescence properties of Ni2+ doped GCs containing ZnGa2O4, germanium-substituted ZnGa2O4 nano-spinels (Zn1+xGa2−2xGexO4), and Zn2GeO4/Li2Ge4O9 composite nanocrystals that are free of Ga3+. The results show that ZnGa2O4: Ni2+ GCs exhibit a significantly enhanced NIR emission. The incorporation of the nucleating agent TiO2 is favored in terms of the increased luminescence intensity and prolonged lifetime. The possible causes for the enhancement effect are identified from the crystal structure/defects viewpoint. The newly developed GCs incorporate good reproducibility to allow for a tolerance of thermal treatment temperature and hence hold great potential of fiberization via the recently proposed “melt-in-tube” method. They can be considered as promising candidates for broadband fiber amplifiers.

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Long-lasting luminescent ZnGa₂O₄:Cr³⁺transparent glass-ceramics

Abstract: Highly transparent ZnGa2O4 glass-ceramic materials, showing red long-lasting luminescence arising from the entire sample volume, are reported.

Cited by 75 publications

References 41 publications

Pressureless glass crystallization of transparent yttrium aluminum garnet-based nanoceramics

Pressureless glass crystallization of transparent yttrium aluminum garnet-based nanoceramics

Counting the Photons: Determining the Absolute Storage Capacity of Persistent Phosphors

Selective doping of Ni2+ in highly transparent glass-ceramics containing nano-spinels ZnGa2O4 and Zn1+x Ga2−2x Ge x O4 for broadband near-infrared fiber amplifiers

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