Study on the optical band gap and photoluminescence of PbMoO<sub>4</sub> nano powder synthesized by an auto igniting combustion technique

Vidya, S.; Thomas, J. K.

doi:10.1088/1757-899x/73/1/012120

Cited by 8 publications

(4 citation statements)

References 6 publications

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“…The low‐energy tail of this band extends to about 750 nm . Emission band with a peak at 460 nm has been observed in PbMoO 4 , which is attributed to the 1 T 2 → 1 A 1 transition of MoO 4 tetrahedron . Similar broad MoO 4 emission band with a peak at 550 nm, which extends to about 800 nm, has been observed in SrMoO 4 and in BaMoO 4 .…”

Section: Resultssupporting

confidence: 59%

Emission from Mo‐O charge‐transfer state and Yb³⁺ emission in Eu³⁺‐doped and nondoped molybdates under UV excitation

Qiao

Tsuboi

2017

J Am Ceram Soc

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Molybdates of Li + and Yb 3+ are studied to investigate the luminescence under UV excitation. LiYb(MoO 4 ) 2 and Eu 3+ -doped LiYb 1x Eux(MoO 4 ) 2 (x=001-1.0) phosphors were synthesized by solid state reaction under mixing of Eu 2 O 3 , Yb 2 O 3 , Li 2 CO 3 and MoO 2 in air atmosphere. Two broad absorption bands centered at 333 and 236 nm are observed in LiYb(MoO 4 ) 2 compound. They are attributed to the 1 A 1 ? 1 T 1 and 1 T 2 transitions due to the O 2À ?Mo 6+ electron transfers in MoO 4 tetrahedron. An emission band with a peak at about 440 nm is found, which is attributed to the 3 T 1 ? 1 A 1 transition of MoO 4 . Appearance of near-infrared (NIR) Yb 3+ emission observed under UV excitation is understood by the MoO 4 ?Yb 3+ Foerster-Type energy transfer due to spectral overlap between the low-energy tail of the broad 440 nm emission band and the high-energy tail of the broad Yb 3+ absorption band and due to short Yb 3+ -MoO 4 distance. Yb 3+ emission observed in LiYb 1Àx Eu x (MoO 4 ) 2 by Eu 3+ excitation is understood by the Eu 3+ ?Yb 3+ energy transfer by cross-relaxation (CR) process between the 5 D 0 ? 7 F 6 Eu 3+ transition and the 2 F 7/2 ? 2 F 5/2 Yb 3+ transition. The CR efficiency shows maximum efficiency of 0.24 at x=0.15 of higher acceptor Yb 3+ concentration than donor Eu 3+ concentration. Three Yb 3+ emission bands with peaks at 994, 1002, and 1023 nm are observed, depending on the excitation wavelength. This is explained by less-shielded 4f electrons of Yb 3+ by the 5s 2 5p 6 outermost electron shells, which are also responsible for unusual broadband Yb 3+ absorption and emission. From appearance of NIR Yb 3+ emission under excitation by not only UV light but also red light, these compounds are expected to be suitable for efficient photovoltaic application to Si-based solar cells. K E Y W O R D S europium, fluorescence, optical materials/properties, phosphors, ytterbium, photoluminescence

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Section: Resultssupporting

confidence: 59%

Emission from Mo‐O charge‐transfer state and Yb³⁺ emission in Eu³⁺‐doped and nondoped molybdates under UV excitation

Qiao

Tsuboi

2017

J Am Ceram Soc

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“…Up‐conversion (UC) materials, which have the ability to covert low energy photons that belong to near infrared (NIR) part of spectrum into higher energy photons of visible light, are of a great interest in the last decade due to their wide application such as solid‐state lasers, optical data storage, solar cells, temperature sensors, drug delivery carriers, scintillators, biomarkers . Such materials include tungstates, molybdates, oxides, fluorides, oxyfluorides, etc. Fluorides of NaYF 4 type are considered to be representatives, due to their low phonon energy (about 350 cm −1 ), low toxicity, high chemical stability, and fact that are excellent hosts for rare earth elements doping.…”

Section: Introductionmentioning

confidence: 99%

The gadolinium effect on crystallization behavior and luminescence of β‐NaYF₄:Yb,Er phase

Vuković

Mančić

Dinić

et al. 2019

Int J Applied Ceramic Tech

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Single phase β-NaY 0.8-x Gd x Yb 0.18 Er 0.02 F 4 nanoparticles with different concentrations of gadolinium ions were prepared via PVP-assisted solvothermal treating at 200°C (PVP-polyvinylpyrrolidone). With the increase in Gd 3+ concentration, size of the nanoparticles decreased. The up-converting spectra recorded upon 980 nm irradiation showed the green (510-560 nm) and red (640-690 nm) emissions, due to 2 H 11/2 , 4 S 3/2 → 4 I 15/2 and 4 F 9/2 → 4 I 15/2 transitions, respectively. The strongest up-conversion luminescence was detected in 15 mol% Gd 3+ -doped nanoparticles obtained after 20 hours of solvothermal treating. With the rise of Gd 3+ content up-conversion emission decreased due to increased defect concentration in the NaYF 4 matrix. Fourier transform infrared spectroscopy proved in situ generation of hydrophilic nanoparticles as a result of PVP ligands retention at the particle surface.

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“…Inorganic materials doped with rare earth ions (RE 3þ ) have been extensively studied based on their f -f type transitions due to their wide application in the field of illumination [18,19]. The electronic transitions and structural defects that RE 3þ dopants cause within a lattice are responsible for generating characteristics at the energy levels of the crystal that helps design phosphors for visualization applications.…”

Section: Introductionmentioning

confidence: 99%

Photoluminescence properties of (Eu, Tb, Tm) co-doped PbMoO4 obtained by sonochemical synthesis

Gurgel

Lovisa

Pereira

et al. 2017

Journal of Alloys and Compounds

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The PbMoO 4 co-doped with Tm 3þ , Tb 3þ Eu 3þ with scheelita structure was synthesized by the sonochemical method. The photoluminescent properties, structural and color coordinates emitted by phosphors were investigated. The structural analysis of the crystal and the changes in lattice parameters confirm that the rare earth ions (RE 3þ) were successfully introduced into the host of the PbMoO 4. The relationship between energy gap (Egap) and the concentration of RE 3þ ions was also discussed, the Egap is significantly influenced by the degree of structural order-disorder present in the crystal lattice. The PbMoO 4 :RE 3þ shows light emission in green. Under UV excitation, Photoluminescence (PL) shows a broad band centered at 520 nm and smaller bands belonging to transitions of RE 3þ :

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Study on the optical band gap and photoluminescence of PbMoO₄ nano powder synthesized by an auto igniting combustion technique

Cited by 8 publications

References 6 publications

Emission from Mo‐O charge‐transfer state and Yb³⁺ emission in Eu³⁺‐doped and nondoped molybdates under UV excitation

Emission from Mo‐O charge‐transfer state and Yb³⁺ emission in Eu³⁺‐doped and nondoped molybdates under UV excitation

The gadolinium effect on crystallization behavior and luminescence of β‐NaYF₄:Yb,Er phase

Photoluminescence properties of (Eu, Tb, Tm) co-doped PbMoO4 obtained by sonochemical synthesis

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Study on the optical band gap and photoluminescence of PbMoO4 nano powder synthesized by an auto igniting combustion technique

Cited by 8 publications

References 6 publications

Emission from Mo‐O charge‐transfer state and Yb3+ emission in Eu3+‐doped and nondoped molybdates under UV excitation

Emission from Mo‐O charge‐transfer state and Yb3+ emission in Eu3+‐doped and nondoped molybdates under UV excitation

The gadolinium effect on crystallization behavior and luminescence of β‐NaYF4:Yb,Er phase

Photoluminescence properties of (Eu, Tb, Tm) co-doped PbMoO4 obtained by sonochemical synthesis

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Study on the optical band gap and photoluminescence of PbMoO₄ nano powder synthesized by an auto igniting combustion technique

Emission from Mo‐O charge‐transfer state and Yb³⁺ emission in Eu³⁺‐doped and nondoped molybdates under UV excitation

Emission from Mo‐O charge‐transfer state and Yb³⁺ emission in Eu³⁺‐doped and nondoped molybdates under UV excitation

The gadolinium effect on crystallization behavior and luminescence of β‐NaYF₄:Yb,Er phase