Energy transfer from Pr 3+ to Gd 3+ ions in BaB 8 O 13 phosphor for phototherapy lamps

Tamboli, Sumedha; Nair, Govind B.; Burghate, D. K.

doi:10.1016/j.physb.2017.07.042

Cited by 31 publications

(8 citation statements)

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“…An additional peak was observed at 22.00° that might be due to the doping of RE ions in the host lattice. [ 24–26 ] This increase in intensity after doping with Dy 3+ may be due to an internal change in local crystal structure. [ 27,28 ]…”

Section: Resultsmentioning

confidence: 99%

“…An additional peak was observed at 22.00 that might be due to the doping of RE ions in the host lattice. [24][25][26] This increase in intensity after doping with Dy 3+ may be due to an internal change in local crystal structure. [27,28] It is well known that four main peaks (222), (400), (440), and (622) are characteristic of a defective fluorite structure.…”

Section: Phase and Crystal Analysismentioning

confidence: 99%

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Luminescence study of Sm³⁺,Eu³⁺‐doped Y₂Zr₂O₇ host: optical investigation of greenish yellow to red colour tunable pyrochlore phosphor

et al. 2022

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Pyrochlore phosphors have shown their worth in modern day lighting in the last few years. Colour tunability of the phosphor is one of the modern techniques used to obtain white light‐emitting diodes (WLEDs). In the proposed work, Y2Zr2O7:Sm3+,Eu3+ phosphors were investigated for WLED applications as well as display devices. A convectional solid‐state diffusion method was used to synthesize the proposed phosphors. X‐ray diffraction of the proposed phosphors was performed and compared with the standard Inorganic Crystal Structure Database. The crystal structure of the sample was cubic in nature, obtained from Rietveld refinement. Vibrational and morphological studies on the samples were carried out using Fourier transform infrared spectroscopy and scanning electron microscopy analysis. The photoluminescence study of the colour tunable phosphor showed the characteristic peak of Sm3+ together with the two sharp peaks of Eu3+ ions. Greenish yellow to red colour tunability was observed in the proposed phosphor with enhancement of Eu3+ ions. All these results showed the worth of this sample for WLEDs applications as well as in display devices.

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Section: Resultsmentioning

confidence: 99%

Section: Phase and Crystal Analysismentioning

confidence: 99%

Luminescence study of Sm³⁺,Eu³⁺‐doped Y₂Zr₂O₇ host: optical investigation of greenish yellow to red colour tunable pyrochlore phosphor

et al. 2022

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“…From Figure , a spectral overlap between the emission spectrum of Ce 3+ and the excitation spectrum of Tb 3+ can be seen. The prime condition for the energy transfer to take place is that there should be a spectral overlap between the emission and excitation spectra of sensitizers and activators, respectively . The Ce 3+ ions when excited by 279 nm emits in the broad band ranging from 300 to 400 nm, which is the excitation region for Tb 3+ ions as shown in Figure .…”

Section: Resultsmentioning

confidence: 99%

Green‐light emission through energy transfer from Ce³⁺ to Tb³⁺ ions in the Li₂SO₄–Al₂(SO₄)₃ system

2019

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An energy transfer process from Ce3+ to Tb3+ ions was successfully achieved in a Li2SO4–Al2(SO4)3 mixed‐sulphate system. A wet‐chemical synthesis was employed to prepare the Li2SO4–Al2(SO4)3 system by doping Ce3+ and Tb3+ ions individually as well as collectively. The phases were identified using X‐ray diffraction studies. The as‐prepared samples were characterized by FT‐IR and photoluminescence measurements. Green‐light emission was exhibited by Ce3+, Tb3+ co‐doped Li2SO4–Al2(SO4)3 system, thus, indicating its potential as a material for display devices or in the lamp industry.

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“…The UV-B band at 313 nm is very typical of the Gd 3+ ions and it's related to transitions corresponding to the 6 P7/2 → 8 S7/2 energy states [12] as depicted on Figure 4b. This type of radiation is known to be effective for treating skin diseases such as vitiligo vulgaris, psoriasis, and periodontitis [13][14][15][16][17][18]. The red emission peak at 628 nm can be attributed to the 6 G7/2 → 6 P3/2 transition as the excitation energy of 5.39 eV should be enough for the excited electron to reach the conduction band of the host material where the 6 Gj energy state of Gd 3+ is located [19].…”

Section: Optical Propertiesmentioning

confidence: 99%

Surface and Optical Properties of Gd-Doped ZrO2 Nano Films

Dimitrov

Stambolova

Vassilev

et al. 2020

The 2nd International Online-Conference on Nanomaterials

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Nanosized coatings of ZrO2 were deposited on silicon substrates using sol-gel and spin coating techniques. The precursor solutions were prepared from ZrOCl2.8H2O with the addition of different percentage (0.5–5%) of rare earth Gd3+ ions as dopant. The thin films were homogeneous, with average thickness of 115 nm and refractive index (n) of 1.83. The X-ray diffraction analysis (XRD) revealed the presence of a varying mixture of monoclinic and tetragonal ZrO2 polycrystalline phases, depending on the dopant, all of which with nanosized crystallites. Scanning electron microscopy (SEM) as well as atomic force microscopy (AFM) methods were deployed to investigate the surface morphology and roughness of the thin films, respectively. They revealed a smooth, well uniform and crack-free surface with average roughness of 0.8 nm. It was established that the dopant concentration affects the photoluminescence (PL) properties of the samples. The undoped films exhibited broad violet-blue PL emission, while the addition of Gd3+ ions resulted in new narrow bands in both UV-B and visible light regions, characteristic of the rare earth metal. The intensive emission located at 313 nm can find useful application in medical lamps for treatment of different skin conditions.

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Energy transfer from Pr 3+ to Gd 3+ ions in BaB 8 O 13 phosphor for phototherapy lamps

Cited by 31 publications

References 20 publications

Luminescence study of Sm³⁺,Eu³⁺‐doped Y₂Zr₂O₇ host: optical investigation of greenish yellow to red colour tunable pyrochlore phosphor

Luminescence study of Sm³⁺,Eu³⁺‐doped Y₂Zr₂O₇ host: optical investigation of greenish yellow to red colour tunable pyrochlore phosphor

Green‐light emission through energy transfer from Ce³⁺ to Tb³⁺ ions in the Li₂SO₄–Al₂(SO₄)₃ system

Surface and Optical Properties of Gd-Doped ZrO2 Nano Films

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Energy transfer from Pr 3+ to Gd 3+ ions in BaB 8 O 13 phosphor for phototherapy lamps

Cited by 31 publications

References 20 publications

Luminescence study of Sm3+,Eu3+‐doped Y2Zr2O7 host: optical investigation of greenish yellow to red colour tunable pyrochlore phosphor

Luminescence study of Sm3+,Eu3+‐doped Y2Zr2O7 host: optical investigation of greenish yellow to red colour tunable pyrochlore phosphor

Green‐light emission through energy transfer from Ce3+ to Tb3+ ions in the Li2SO4–Al2(SO4)3 system

Surface and Optical Properties of Gd-Doped ZrO2 Nano Films

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Luminescence study of Sm³⁺,Eu³⁺‐doped Y₂Zr₂O₇ host: optical investigation of greenish yellow to red colour tunable pyrochlore phosphor

Luminescence study of Sm³⁺,Eu³⁺‐doped Y₂Zr₂O₇ host: optical investigation of greenish yellow to red colour tunable pyrochlore phosphor

Green‐light emission through energy transfer from Ce³⁺ to Tb³⁺ ions in the Li₂SO₄–Al₂(SO₄)₃ system