Enhanced UV emission of Gd3+ in glass by Ag+ co-doping

Jiménez, José A.

doi:10.1016/j.matlet.2015.06.110

Cited by 22 publications

(9 citation statements)

References 22 publications

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“…This is at least two times the reported enhancement of Gd 3+ UVB emission obtained by excitation energy transfer from Ag + ions in the Ag−Gd codoped phosphate matrix. 5 The degree of enhancement is also greater than those reported by Kalpana et al 7 and Gandhi et al 22 of about four times for Gd 3+ -containing BaO−B 2 O 3 −P 2 O 5 and Li 2 O−PbO−P 2 O 5 glasses when mixed with 3.0 mol % of Al 2 O 3 and 3.0 mol % of SnO 2 , respectively. The top inset of Figure 5 shows a plot of the Gd 3+ UV emission intensity as a function of the Si contents, where the linear regression performed yielded a correlation coefficient r = 0.970.…”

Section: ■ Results and Discussionmentioning

confidence: 64%

“…In addition, as shown magnified in the inset of Figure 4, the 0.5Si−Gd glass displays visibly the absorption features characteristic of Gd 3+ ions around 275 nm. 1−5 In Figure 5, the PL of the Gd, 0.2Si−Gd, and 0.5Si−Gd glasses is examined under excitation at 275 nm, which is resonant with 8 S 7/2 → 6 I J transitions in Gd 3+ ions 1,5 (excitation spectra shown as Supporting Information, Figure S3). Interestingly, the UV type B emission of Gd 3+ around 312 nm due to 6 P 7/2 → 8 S 7/2 transitions increases noticeably with increasing concentration of silicon added to the 0.2Si−Gd and 0.5Si−Gd glasses.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

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Silicon-Induced UV Transparency in Phosphate Glasses and Its Application to the Enhancement of the UV Type B Emission of Gd³⁺

Jiménez

2017

ACS Appl. Mater. Interfaces

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The silicon route to improve the ultraviolet (UV) transparency in phosphate glasses is investigated and further exploited to enhance the UV type B (280-320 nm) emission of gadolinium(III) relevant for biomedical applications. The glasses were synthesized with a barium phosphate composition by melt-quenching in ambient atmosphere and the optical properties investigated by optical absorption and photoluminescence (PL) spectroscopy including emission decay kinetics. An improvement in the UV transparency was gradually developed for the glasses melted merely with increasing amounts of Si powder. A particular PL in the visible was also exhibited for such glasses under excitation at 275 nm, consistent with the presence of Si-induced defects. For Si-Gd codoped glasses, the UV transparency was likewise manifested, while the UV emission from Gd around 312 nm was enhanced with the increase in Si concentration (up to ∼6.7 times). Moreover, along with the Gd PL intensity enhancement, a linear correlation was revealed between the increase in decay times for the GdP-emitting state and the amount of silicon. It is then suggested that the improved PL properties of gadolinium(III) originate from the increased UV transparency of the host and the consequent precluding of a nonradiative energy transfer from Gd to the matrix. Accordingly, a role of Si as PL quenching inhibitor is supported. The demonstrated efficacy of the Si-Gd codoping concept realized by a facile glass synthesis procedure may appeal to the application of the UV-emitting glasses for phototherapy lamps.

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Section: ■ Results and Discussionmentioning

confidence: 64%

Section: ■ Results and Discussionmentioning

confidence: 99%

Silicon-Induced UV Transparency in Phosphate Glasses and Its Application to the Enhancement of the UV Type B Emission of Gd³⁺

Jiménez

2017

ACS Appl. Mater. Interfaces

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“…There have been a number of reports on Gd 3+ -doped UV-emitting phosphors published so far. Jiménez [30] reported an enhanced UV emission of the Gd 3+ in glass that was achieved using a silver-ion (Ag + ) codoping. Singh et al [31] studied UVB emission in the Gd-activated Y 4 Zr 3 O 12 phosphor.…”

Section: Introductionmentioning

confidence: 99%

Ultraviolet B emission from a $$\hbox {Gd}^{3+}$$ Gd 3 + -doped $$\hbox {BaAl}_{2}\hbox {O}_{4}$$

Singh

Sivaramaiah²,

Singh

et al. 2019

Bull Mater Sci

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A BaAl 2 O 4 :Gd 3+ phosphor was successfully prepared using a combustion technique. An X-ray diffraction pattern was used to characterize the resultant phosphor, and the photoluminescence (PL) of the prepared BaAl 2 O 4 :Gd 3+ was studied. Under a 273-nm excitation, the main emission peak of the phosphor is located at 314 nm, and this is attributed to the 6 P 7/2 → 8 S 7/2 transition of Gd 3+. Electron paramagnetic resonance (EPR) spectrum appears to be U-shaped, and lines are evident at g eff ∼ 2.14, 4.56 and 6.75. The PL and EPR analyses indicate the presence of Gd as Gd 3+ in this sample.

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“…A broad emission band is observed before HT which shows a dip around 410 nm. The broad luminescence can be ascribed to single Ag + ions in connection to electronic relaxation from the 4 d 9 5 s 1 excited‐state configuration . The excitation at 280 nm produces light absorption in Ag + ions owing to 1 S 0 → 1 D 2 transitions.…”

Section: Resultsmentioning

confidence: 99%

Ag and Si Codoped Phosphate Glasses: Plasmonic Nanocomposites with Enhanced UV Transparency

Jiménez

2016

J. Am. Ceram. Soc.

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The use of silicon powder to produce plasmonic Ag nanocomposite phosphate glasses which also exhibit improved transparency in the ultraviolet (UV) is proposed. Ag2O/Si codoped glasses were prepared in a barium‐phosphate matrix by a simple melt‐quench method in ambient atmosphere. The as‐prepared glasses exhibit enhanced UV transparency, whereby the surface plasmon resonance of Ag nanoparticles (NPs) is manifested for the glasses with higher Ag2O contents. 31P nuclear magnetic resonance spectroscopy is consistent with the formation of P–O–Si bonds, thus suggesting their possible role on the improved UV light transmission. Consequently, a model was presented accounting for the influence of silicon on the polymerization of the phosphate network concomitant with the creation of highly reactive oxygen species. Further exploiting the proposed reactive species, a real‐time spectroscopic study of the plasmonic response of Ag NPs in Ag/Si codoped glass samples was carried out during an in situ thermal processing. The temperature dependence of the Ag particle precipitation was studied in the 400°C–430°C range, from which an Arrhenius‐type plot allowed for estimating the activation energy of the process at 3.42 (±0.38) eV. Ultimately, the vanishing of the luminescence ascribed to Ag+ ions was observed in a heat‐treated sample, consistent with the high reactivity acquired by the glass matrix. Silicon thus appears promising for producing UV transparent glasses for high‐performance optics and for the reduction of Ag+ ions to produce Ag nanocomposites valuable for photonic (nanoplasmonic) applications.

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Enhanced UV emission of Gd3+ in glass by Ag+ co-doping

Cited by 22 publications

References 22 publications

Silicon-Induced UV Transparency in Phosphate Glasses and Its Application to the Enhancement of the UV Type B Emission of Gd³⁺

Silicon-Induced UV Transparency in Phosphate Glasses and Its Application to the Enhancement of the UV Type B Emission of Gd³⁺

Ultraviolet B emission from a $$\hbox {Gd}^{3+}$$ Gd 3 + -doped $$\hbox {BaAl}_{2}\hbox {O}_{4}$$

Ag and Si Codoped Phosphate Glasses: Plasmonic Nanocomposites with Enhanced UV Transparency

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Enhanced UV emission of Gd3+ in glass by Ag+ co-doping

Cited by 22 publications

References 22 publications

Silicon-Induced UV Transparency in Phosphate Glasses and Its Application to the Enhancement of the UV Type B Emission of Gd3+

Silicon-Induced UV Transparency in Phosphate Glasses and Its Application to the Enhancement of the UV Type B Emission of Gd3+

Ultraviolet B emission from a $$\hbox {Gd}^{3+}$$ Gd 3 + -doped $$\hbox {BaAl}_{2}\hbox {O}_{4}$$

Ag and Si Codoped Phosphate Glasses: Plasmonic Nanocomposites with Enhanced UV Transparency

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Silicon-Induced UV Transparency in Phosphate Glasses and Its Application to the Enhancement of the UV Type B Emission of Gd³⁺

Silicon-Induced UV Transparency in Phosphate Glasses and Its Application to the Enhancement of the UV Type B Emission of Gd³⁺