Plasmonic enhancement of upconversion emission in Ag@NaYF4:Er3+/Yb3+ phosphor

Maurya, S. K.; Tiwari, S.P.; Kumar, Abhishek; Kumar, Kaushal

doi:10.1016/j.jre.2018.03.003

Cited by 23 publications

(9 citation statements)

References 51 publications

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“…The additional N-doped and CNS-doped TiO 2 phosphor composites show higher absorption intensities and a slight shift towards the visible region; the red-shift has been referenced by other researchers as being because of the lower energy levels in TiO 2 imparted by N or CNS doping elements [20,36]. the Er 3+ co-activator [35]. However, coating TiO2 on phosphor broadened the absorption spectra.…”

Section: Resultsmentioning

confidence: 76%

“…The stretching vibrations at 1044 and 616 cm −1 are because of hyponitrite and the Ti-O groups, respectively [34]. S9 absorption peaks were centered at 524 and 654 nm due to the Er 3+ co-activator [35]. However, coating TiO 2 on phosphor broadened the absorption spectra.…”

Section: Resultsmentioning

confidence: 98%

“…The third condition is CNS-doped TiO2 supported on NaYF4:Yb,Er, where the dotted line in the TiO2 band represents discrete energy levels imparted by C, N, or S elements. As illustrated, the upconversion phosphor as the support material contains Yb 3+ as the NIR sensitizer in the 2 F7/2 state, which transfers energy to the co-activator or Er 3+ through the 4 F7/2 and 4 I11/2 states [35,38,39]. Simultaneously, the Er 3+ emits UV-Vis-NIR photons of less than 980 nm.…”

Section: Discussionmentioning

confidence: 99%

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Photocatalytic Reactivity of Carbon–Nitrogen–Sulfur-Doped TiO2 Upconversion Phosphor Composites

et al. 2020

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Sol–gel synthesized N-doped and carbon–nitrogen–sulfur (CNS)-doped TiO2 solutions were deposited on upconversion phosphor using a dip coating method. Scanning electron microscopy (SEM) imaging showed that there was a change in the morphology of TiO2 coated on NaYF4:Yb,Er from spherical to nanorods caused by additional urea and thiourea doping reagents. Fourier transform infrared (FTIR) spectroscopy further verified the existence of nitrate–hyponitrite, carboxylate, and SO42− because of the doping effect. NaYF4:Yb,Er composites coated with N- and CNS-doped TiO2 exhibited a slight shift of UV-Vis spectra towards the visible light region. Photodecomposition of methylene blue (MB) was evaluated under 254 nm germicidal lamps and a 300 W Xe lamp with UV/Vis cut off filters. The photodegradation of toluene was evaluated on TiO2/NaYF4:Yb,Er and CNS-doped TiO2/NaYF4:Yb,Er samples under UV light illumination. The photocatalytic reactivity with CNS-doped TiO2/NaYF4:Yb,Er surpassed that of the undoped TiO2/NaYF4:Yb,Er for the MB solution and toluene. Photocatalytic activity is increased by CNS doping of TiO2, which improves light sensitization as a result of band gap narrowing due to impurity sites.

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Section: Resultsmentioning

confidence: 76%

Section: Resultsmentioning

confidence: 98%

Section: Discussionmentioning

confidence: 99%

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Photocatalytic Reactivity of Carbon–Nitrogen–Sulfur-Doped TiO2 Upconversion Phosphor Composites

et al. 2020

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“…As a matter of fact, the presence of gold NPs brings about absorption losses and introduces non-radiative decay channels that are detrimental for the UCPL, as previously reported for NaYF 4 :Yb,Er NPs decorated with Ag NPs. 46 In contrast, for the red emission band (red shaded region in Fig. 2b ), UCPL is enhanced roughly by ∼30% for gold-containing films, as shown in Fig.…”

Section: Resultsmentioning

confidence: 80%

Enhanced up-conversion photoluminescence in fluoride–oxyfluoride nanophosphor films by embedding gold nanoparticles

2022

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“…Upconversion (UC) phosphor materials doped/codoped with rare earth elements have attracted the interest of researchers due to their multipurpose applications. [1][2][3][4][5][6][7][8] The biological application of UC materials is possible due to key material properties made possible by the fluoride based phosphor materials. 4,6 Thus, due to their high luminescence intensity, low phonon frequency, and high refractive index, fluoride based UC phosphor materials are preferred to oxide based host materials.…”

Section: Introductionmentioning

confidence: 99%

Future prospects of fluoride based upconversion nanoparticles for emerging applications in biomedical and energy harvesting

Tiwari

Maurya

Yadav

et al. 2018

Journal of Vacuum Science &Amp; Technology B, Nanotechnology and Microelectronics: Materials, Processing, Measurement, and Phen

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Rare earth doped/codoped phosphors have been extensively studied for different types of applications based on their intense luminescence features. For this, researchers have tried to choose the inorganic host matrices having both a low phonon cut-off frequency and a high refractive index. Many articles have been published on oxide based phosphor materials, but due to their high cut-off phonon frequency, use of these materials is restricted for optical based applications. This is why additional research has been carried out on fluoride based host materials because of their low phonon frequencies, low composition degradation, and high quantum efficiency. In this paper, the authors review the rare earth fluoride based host nano-and micromaterials for different applications and discuss possible mechanisms.

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Plasmonic enhancement of upconversion emission in Ag@NaYF4:Er3+/Yb3+ phosphor

Cited by 23 publications

References 51 publications

Photocatalytic Reactivity of Carbon–Nitrogen–Sulfur-Doped TiO2 Upconversion Phosphor Composites

Photocatalytic Reactivity of Carbon–Nitrogen–Sulfur-Doped TiO2 Upconversion Phosphor Composites

Enhanced up-conversion photoluminescence in fluoride–oxyfluoride nanophosphor films by embedding gold nanoparticles

Future prospects of fluoride based upconversion nanoparticles for emerging applications in biomedical and energy harvesting

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