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Green-Emitting Gd 3 Ga 5 O 12 : Tb 3+ Nanoparticles Phosphor: Synthesis, Structure, and Luminescence

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ABSTRACT

Nano- and microceramics of Gd3Ga5O12 garnet doped with 1 mol % Tb3+ ions were synthesized via co-precipitation and high-temperature solid-state reaction methods. X-ray diffraction measurements confirmed the formation of the garnet structure with Ia3d space group in all investigated samples. Atomic force microscopy surface images and grain-size distribution diagrams of Gd3Ga5O12: 1 mol % Tb3+ nanoceramics with 300 and 400 g/mol of polyethylene glycol (PEG) were obtained. The relationship between the content of polyethylene glycol and the particle size of Gd3Ga5O12: Tb3+ phosphors was revealed. An intense broad band (λm = 266 nm) related to spin-allowed 4f8-4f75d1 transitions of Tb3+ ions was found in photoluminescence excitation spectra of Gd3Ga5O12: Tb3+ nanocrystalline ceramics with PEG-300 and PEG-400 at 300 K. The broad excitation band caused by spin-forbidden (λm = 295 nm) 4f-5d transitions in Tb3+ ions was additionally observed in the photoluminescence excitation spectra of Gd3Ga5O12: Tb3+ microceramics. Emission of Tb3+ ions under X-ray and UV excitations is presented by two groups of sharp lines which correspond to 5D3 and 5D4 → 7Fj transitions of Tb3+ ions with the most intense line at 546 nm (5D4 → 7F5). It was established that the increasing of PEG content leads to the decreasing of the X-ray and photoluminescence emission intensities.

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SEM image of cleavage surface of Gd3Ga5O12: 1 mol % Tb3+ microcrystalline sample synthesized via solid-state reaction method
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Fig5: SEM image of cleavage surface of Gd3Ga5O12: 1 mol % Tb3+ microcrystalline sample synthesized via solid-state reaction method

Mentions: Figure 5 shows SEM cleavage surface image of gadolinium gallium garnet microcrystalline sample. The irregular shape of crystallites is observed from this image. It can be seen that microcrystalline sample possesses a broad grain-size distribution. The grain size varies from a few to tens of micrometers. Small-sized grains fill the voids between huge size grains and complete it into the solid ceramic material.Fig. 5


Green-Emitting Gd 3 Ga 5 O 12 : Tb 3+ Nanoparticles Phosphor: Synthesis, Structure, and Luminescence
SEM image of cleavage surface of Gd3Ga5O12: 1 mol % Tb3+ microcrystalline sample synthesized via solid-state reaction method
© Copyright Policy - OpenAccess
Related In: Results  -  Collection

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Show All Figures
getmorefigures.php?uid=PMC5383918&req=5

Fig5: SEM image of cleavage surface of Gd3Ga5O12: 1 mol % Tb3+ microcrystalline sample synthesized via solid-state reaction method
Mentions: Figure 5 shows SEM cleavage surface image of gadolinium gallium garnet microcrystalline sample. The irregular shape of crystallites is observed from this image. It can be seen that microcrystalline sample possesses a broad grain-size distribution. The grain size varies from a few to tens of micrometers. Small-sized grains fill the voids between huge size grains and complete it into the solid ceramic material.Fig. 5

View Article: PubMed Central - PubMed

ABSTRACT

Nano- and microceramics of Gd3Ga5O12 garnet doped with 1 mol % Tb3+ ions were synthesized via co-precipitation and high-temperature solid-state reaction methods. X-ray diffraction measurements confirmed the formation of the garnet structure with Ia3d space group in all investigated samples. Atomic force microscopy surface images and grain-size distribution diagrams of Gd3Ga5O12: 1 mol % Tb3+ nanoceramics with 300 and 400 g/mol of polyethylene glycol (PEG) were obtained. The relationship between the content of polyethylene glycol and the particle size of Gd3Ga5O12: Tb3+ phosphors was revealed. An intense broad band (λm = 266 nm) related to spin-allowed 4f8-4f75d1 transitions of Tb3+ ions was found in photoluminescence excitation spectra of Gd3Ga5O12: Tb3+ nanocrystalline ceramics with PEG-300 and PEG-400 at 300 K. The broad excitation band caused by spin-forbidden (λm = 295 nm) 4f-5d transitions in Tb3+ ions was additionally observed in the photoluminescence excitation spectra of Gd3Ga5O12: Tb3+ microceramics. Emission of Tb3+ ions under X-ray and UV excitations is presented by two groups of sharp lines which correspond to 5D3 and 5D4 → 7Fj transitions of Tb3+ ions with the most intense line at 546 nm (5D4 → 7F5). It was established that the increasing of PEG content leads to the decreasing of the X-ray and photoluminescence emission intensities.

No MeSH data available.