Luminescent properties and energy transfer mechanism of NaGd(MoO4)2:Sm3+, Eu3+ phosphors

Bi, Wenbo; Meng, Qingyu; Sun, Wei

doi:10.1016/j.ceramint.2016.06.017

Cited by 28 publications

(6 citation statements)

References 29 publications

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“…Hence, the concentration quenching mechanism in LL 1− x M: x Sm 3+ is by electric dipole—electric dipole interaction. This concentration quenching mechanism is consistent with that in NaGd(MoO 4 ) 2 :Sm 3+ ,Eu 3+ [48]. …”

Section: Resultssupporting

confidence: 87%

“…The excitation spectra are composed of a broad band in the ultraviolet region and a number of narrow-band peaks in the near-ultraviolet to visible region. There is a wide absorption band from 230 to 320 nm, attributed to the charge transfer transition O 2− → Mo 6+ due to the transition of a 2 p electron of O 2− to the d orbital of Mo 6+ [48]. The narrow bands detected over 340–550 nm are the typical weak, sharp 4f—4f transitions of rare earth ions and the terminal states of Sm 3+ are labeled.…”

Section: Resultsmentioning

confidence: 99%

“…Hence, the inhomogeneous broadening of the bands occurs when rare earth ions are doped to replace La 3+ ions in these crystals [47]. Many groups have made efforts to develop such phosphors, for example: LiLa(MoO 4 ) 2 :Eu 3+ [24], LiY(MoO 4 ) 2 :Sm 3+ [23], KY 1− x Ln x (MoO 4 ) 2 :Ln (Ln = Sm 3+ ,Eu 3+ ) [11], NaGd(MoO 4 ) 2 :Sm 3+ ,Eu 3+ [48], etc. The energy transfer from Sm 3+ to Eu 3+ has been found and the transfer mechanism and efficiency were studied.…”

Section: Introductionmentioning

confidence: 99%

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The Preparation and Optical Properties of Novel LiLa(MoO4)2:Sm3+,Eu3+ Red Phosphor

Luo

Huang

et al. 2018

Materials

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Novel LiLa1−x−y(MoO4)2:xSm3+,yEu3+ (in short: LL1−x−yM:xSm3+,yEu3+) double molybdate red phosphors were synthesized by a solid-state reaction at as low temperature as 610 °C. The optimal doping concentration of Sm3+ in LiLa1−x(MoO4)2:xSm3+ (LL1−xM:xSm3+) phosphor is x = 0.05 and higher concentrations lead to emission quenching by the electric dipole—electric dipole mechanism. In the samples co-doped with Eu3+ ions, the absorption spectrum in the near ultraviolet and blue regions became broader and stronger than these of the Sm3+ single-doped samples. The efficient energy transfer from Sm3+ to Eu3+ was found and the energy transfer efficiency was calculated. Under the excitation at 403 nm, the chromaticity coordinates of LL0.95−yM:0.05Sm3+,yEu3+ approach to the NTSC standard values (0.670, 0.330) continuously with increasing Eu3+ doping concentration. The phosphor exhibits high luminous efficiency under near UV or blue light excitation and remarkable thermal stability. At 150 °C, the integrated emission intensity of the Eu3+ remained 85% of the initial intensity at room temperature and the activation energy is calculated to be 0.254 eV. The addition of the LL0.83M:0.05Sm3+,0.12Eu3+ red phosphors can improve the color purity and reduce the correlated color temperature of WLED lamps. Hence, LL1−x−yM:xSm3+,yEu3+ is a promising WLED red phosphor.

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Section: Resultssupporting

confidence: 87%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The Preparation and Optical Properties of Novel LiLa(MoO4)2:Sm3+,Eu3+ Red Phosphor

Luo

Huang

et al. 2018

Materials

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“…The probable energy transfer pathway, as determined from the analysis above, is displayed in Figure 7. The electrons of Sm 3+ , after being excited into 4 K 11/2 level, rapidly relaxed down to the 4 G 5/2 state owing to lattice vibration, and then returned to the ground states through the energy transfer to the 5 D 0 level rather than the 5 D 1 level of Eu 3+ [23,24]. …”

Section: Resultsmentioning

confidence: 99%

Blue-Light-Excited Eu3+/Sm3+ Co-Doped NaLa(MoO4)2 Phosphors: Synthesis, Characterizations and Red Emission Enhancement for WLEDs

et al. 2018

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The system NaLa(MoO4)2:Eu3+/Sm3+ phosphors were prepared by solid-state reaction followed by heat treatment at 450–600 °C. As shown by X-ray powder diffraction, the phosphors had a body-centered tetragonal structure, high phase purity and high crystallinity. The photoluminescence measurements carried out under excitation at 464 nm indicated the main emission at about 615 nm corresponding to the electric dipole transition 5D0→7F2 of Eu3+, which agreed well with the emission wavelengths of the GaN-based blue LED chips. In NaLa(MoO4)2:Eu3+/Sm3+ phosphors, Sm3+ can efficiently transfer excitation energy to Eu3+, which resulted in a significant improvement of the fluorescence intensity, and the fluorescence intensity of the phosphors calcined at 550 °C maximized at the doping concentrations of Eu3+ and Sm3+ of 15.0 and 2.0 mol %, respectively. The decay curves and CIE (Commission Internationale de L’ Eclairage) coordinates of Sm3+ or/and Eu3+ doped phosphors were analyzed for the investigation of the energy transfer mechanism and color variation trend. Thus, NaLa(MoO4)2:Eu3+,Sm3+ can be classified as a potential red-emitting phosphor for white light-emitting diodes (WLEDs).

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“…No other peak was observed in the excitation spectra of un-doped BaWO 4 . According to the principle of atomic orbital, the strong absorption band of BaWO 4 in ultraviolet region comes from the high vibration energy transition that the electrons of group 2 [19]. The characteristics of the emission peaks at 483 nm (blue) and 571 nm (green) can be detected excited by 350 nm.…”

Section: +mentioning

confidence: 99%

Luminescence Properties of Phosphate Phosphor: Barium Tungstate Doped with Dy

Hu¹,

Zhang²,

Hu³

et al. 2016

MSCE

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Luminescent properties and energy transfer mechanism of NaGd(MoO4)2:Sm3+, Eu3+ phosphors

Cited by 28 publications

References 29 publications

The Preparation and Optical Properties of Novel LiLa(MoO4)2:Sm3+,Eu3+ Red Phosphor

The Preparation and Optical Properties of Novel LiLa(MoO4)2:Sm3+,Eu3+ Red Phosphor

Blue-Light-Excited Eu3+/Sm3+ Co-Doped NaLa(MoO4)2 Phosphors: Synthesis, Characterizations and Red Emission Enhancement for WLEDs

Luminescence Properties of Phosphate Phosphor: Barium Tungstate Doped with Dy

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