Derivation of quantum yields for visible emission transitions of Sm3+ in heavy metal tellurite glass

Wang, X.Y.; Lin, Hai; Li, C.M.; Tanabe, Setsuhisa

doi:10.1016/j.optcom.2007.03.073

Cited by 7 publications

(3 citation statements)

References 14 publications

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“…Based on Figure , one can conclude that the Sm-based lattice is not an efficient luminescence matrix. In general, no high efficiencies are reached in Sm 3+ -doped materials . From the energy level scheme in Figure it can be seen that the Sm 3+ ion possesses a large variety of energy levels in the visible wavelength range.…”

Section: Discussionmentioning

confidence: 97%

“…In general, no high efficiencies are reached in Sm 3+ -doped materials. 62 From the energy level scheme in Figure 20 it can be seen that the Sm 3+ ion possesses a large variety of energy levels in the visible wavelength range. The advantage of this is an efficient energy transfer between Sm and Eu, as was confirmed by the rising component in the 5 D 0 decay.…”

Section: Discussionmentioning

confidence: 99%

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Crystal Structure and Luminescent Properties of R_2–xEu_x(MoO₄)₃ (R = Gd, Sm) Red Phosphors

et al. 2014

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The R 2 (MoO 4 ) 3 (R = rare earth elements) molybdates doped with Eu 3+ cations are interesting redemitting materials for display and solid state lighting applications. The structure and luminescent properties of the R 2−x Eu x (MoO 4 ) 3 (R=Gd, Sm) solid solutions have been investigated as a function of chemical composition and preparation conditions. Monoclinic (α-) and orthorhombic (β´-) R 2−x Eu x (MoO 4 ) 3 (R=Gd, Sm, 0≤x≤2) modifications were prepared by solid-state reaction and their structures were investigated using synchrotron powder X-ray diffraction and transmission electron microscopy. The pure orthorhombic β´-phases could be synthesized only by quenching from high temperature to room temperature for Gd 2−x Eu x (MoO 4 ) 3 in the Eu 3+ -rich part (x > 1) and for all Sm 2−x Eu x (MoO 4 ) 3 solid solutions. The transformation from the α-phase to the β´-phase results in a notable increase (~24%) of the unit cell volume for all R 2−x Eu x (MoO 4 ) 3 (R = Sm, Gd) solid solutions. The luminescent properties of all R 2−x Eu x (MoO 4 ) 3 (R = Gd, Sm; 0≤x≤2) solid solutions were measured, and their optical properties were related to their structural properties. All R 2−x Eu x (MoO 4 ) 3 (R= Gd, Sm; 0≤x≤2) phosphors emit intense red light dominated by the 5 D 0 -7 F 2 transition at ~616 nm. However, a change in the multiplet splitting is observed when switching from the monoclinic to the orthorhombic structure, as a consequence of the change in coordination polyhedron of the luminescent ion from RO 8 to RO 7 for the α-and β´-modification, respectively. The Gd 2−x Eu x (MoO 4 ) 3 solid solutions are the most efficient emitters in the range of 0

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Section: Discussionmentioning

confidence: 97%

Section: Discussionmentioning

confidence: 99%

Crystal Structure and Luminescent Properties of R_2–xEu_x(MoO₄)₃ (R = Gd, Sm) Red Phosphors

et al. 2014

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“…A further increase in the concentration of Sm 3+ cations leads to lower europium luminescence intensity ( Figure 4 and Table S1 ). The phosphors with a high concentration of Sm 3+ are not related to the materials with a high luminescence efficiency [ 34 , 35 ] due to the large number of Sm 3+ energy levels in the visible region of the spectrum ( Figure 9 ). The presence of a large number of energy levels in the Sm 3+ cation promotes energy transfer between the Sm 3+ and Eu 3+ cations.…”

Section: Discussionmentioning

confidence: 99%

Novel Red Phosphor of Gd3+, Sm3+ co-Activated AgxGd((2−x)/3)−0.3−ySmyEu3+0.30☐(1−2x−2y)/3WO4 Scheelites for LED Lighting

et al. 2023

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Gd3+ and Sm3+ co-activation, the effect of cation substitutions and the creation of cation vacancies in the scheelite-type framework are investigated as factors influencing luminescence properties. AgxGd((2−x)/3)−0.3−ySmyEu3+0.3☐(1−2x)/3WO4 (x = 0.50, 0.286, 0.20; y = 0.01, 0.02, 0.03, 0.3) scheelite-type phases (AxGSyE) have been synthesized by a solid-state method. A powder X-ray diffraction study of AxGSyE (x = 0.286, 0.2; y = 0.01, 0.02, 0.03) shows that the crystal structures have an incommensurately modulated character similar to other cation-deficient scheelite-related phases. Luminescence properties have been evaluated under near-ultraviolet (n–UV) light. The photoluminescence excitation spectra of AxGSyE demonstrate the strongest absorption at 395 nm, which matches well with commercially available UV-emitting GaN-based LED chips. Gd3+ and Sm3+ co-activation leads to a notable decreasing intensity of the charge transfer band in comparison with Gd3+ single-doped phases. The main absorption is the 7F0 → 5L6 transition of Eu3+ at 395 nm and the 6H5/2 → 4F7/2 transition of Sm3+ at 405 nm. The photoluminescence emission spectra of all the samples indicate intense red emission due to the 5D0 → 7F2 transition of Eu3+. The intensity of the 5D0 → 7F2 emission increases from ~2 times (x = 0.2, y = 0.01 and x = 0.286, y = 0.02) to ~4 times (x = 0.5, y = 0.01) in the Gd3+ and Sm3+ co-doped samples. The integral emission intensity of Ag0.20Gd0.29Sm0.01Eu0.30WO4 in the red visible spectral range (the 5D0 → 7F2 transition) is higher by ~20% than that of the commercially used red phosphor of Gd2O2S:Eu3+. A thermal quenching study of the luminescence of the Eu3+ emission reveals the influence of the structure of compounds and the Sm3+ concentration on the temperature dependence and behavior of the synthesized crystals. Ag0.286Gd0.252Sm0.02Eu0.30WO4 and Ag0.20Gd0.29Sm0.01Eu0.30WO4, with the incommensurately modulated (3 + 1)D monoclinic structure, are very attractive as near-UV converting phosphors applied as red-emitting phosphors for LEDs.

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Photon Quantization in Sm³⁺ Doped Red Glass Phosphors for Laser‐Induced Illumination

Zhang

Li²,

Zhao³

et al. 2018

Physica Status Solidi (a)

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Multi-peak red fluorescence emissions in Sm 3þ -doped multicomponentalkali-alkaline-borate (MCAAB) glasses for laser-induced illumination are quantitatively characterized, revealing that the quantum yield (QY) is closely related with the wavelength of pumping sources. Under the excitation of 370 nm UVA-LED, the net emission photon numbers of 1.00 wt% Sm 2 O 3doped MCAAB glasses are derived to be 58.0 Â 10 12 cps, and the QY reaches to 25.3% which is about twice as much as 12.2% under 469 nm blue-LED pumping, which is attributed to the better excitability in UVA spectral region. In order to extend the effective excitation range to UVB, Ce 3þ is co-doped in Sm 3þ -doped MCAAB glasses as a sensitizer, which results in an enhancement of Sm 3þ excitation intensity by a maximum sensitization factor of 9.16 in the UVB region. Absolute spectral parameters under 453 nm blue laser excitation exhibit that net emission photon numbers are up to 199.4 Â 10 12 cps in 1.00 wt% Sm 2 O 3 doping case, and QY is solved to be 6.2%. Higher QY of the Sm 3þ -doped MCAAB glasses is expected to be achieved by further adopting wavelength-matched pumping laser, implying that Sm 3þ -doped MCAAB glasses is a promising candidate as high power-density light source in special laser-induced illumination.

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Derivation of quantum yields for visible emission transitions of Sm3+ in heavy metal tellurite glass

Cited by 7 publications

References 14 publications

Crystal Structure and Luminescent Properties of R_2–xEu_x(MoO₄)₃ (R = Gd, Sm) Red Phosphors

Crystal Structure and Luminescent Properties of R_2–xEu_x(MoO₄)₃ (R = Gd, Sm) Red Phosphors

Novel Red Phosphor of Gd3+, Sm3+ co-Activated AgxGd((2−x)/3)−0.3−ySmyEu3+0.30☐(1−2x−2y)/3WO4 Scheelites for LED Lighting

Photon Quantization in Sm³⁺ Doped Red Glass Phosphors for Laser‐Induced Illumination

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Derivation of quantum yields for visible emission transitions of Sm3+ in heavy metal tellurite glass

Cited by 7 publications

References 14 publications

Crystal Structure and Luminescent Properties of R2–xEux(MoO4)3 (R = Gd, Sm) Red Phosphors

Crystal Structure and Luminescent Properties of R2–xEux(MoO4)3 (R = Gd, Sm) Red Phosphors

Novel Red Phosphor of Gd3+, Sm3+ co-Activated AgxGd((2−x)/3)−0.3−ySmyEu3+0.30☐(1−2x−2y)/3WO4 Scheelites for LED Lighting

Photon Quantization in Sm3+ Doped Red Glass Phosphors for Laser‐Induced Illumination

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Product

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Crystal Structure and Luminescent Properties of R_2–xEu_x(MoO₄)₃ (R = Gd, Sm) Red Phosphors

Crystal Structure and Luminescent Properties of R_2–xEu_x(MoO₄)₃ (R = Gd, Sm) Red Phosphors

Photon Quantization in Sm³⁺ Doped Red Glass Phosphors for Laser‐Induced Illumination