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Title: Enhancing luminescence of Lu{sub 2}MoO{sub 6}:Eu{sup 3+} phosphors by doping with Li{sup +} ions for near ultraviolet based solid state lighting

Abstract

Graphical abstract: The emission spectra of Lu{sub 2}MoO{sub 6}:3%Eu{sup 3+}, x%Li{sup +} phosphors under 365 nm excitation. The inset represents emission intensity of 610 nm as a function of Li{sup +} molar concentration. - Highlights: • Lu{sub 2}MoO{sub 6}:3%Eu{sup 3+}, x%Li{sup +} phosphors were synthesized by solid-state reaction method. • All the prepared phosphors can be assigned to its monoclinic phase. • The optimal concentration of Li{sup +} ions is 30mol%. • The luminescent intensity of Lu{sub 2}MoO{sub 6}:Eu{sup 3+} phosphors has been greatly enhanced by codoping Li{sup +} ions. - Abstract: Lu{sub 2}MoO{sub 6}: 3% Eu{sup 3+} co-doped with x% Li{sup +} (x = 0–40 mol) phosphors were synthesized by high-temperature solid-state reaction method. The structure and luminescent properties of these phosphors were investigated. The X-ray diffraction (XRD) results show that all prepared phosphors can be assigned to monoclinic phase and codoping with Li{sup +} ions does not change their crystallographic structure. The excitation and emission spectra show that the samples can be effectively excited by the near ultraviolet light at 365 nm and exhibit strong red emission centered at 610 nm. The experimental results indicate the red luminescent intensity of Lu{sub 2}MoO{sub 6}:Eu{sup 3+} phosphors has been greatlymore » enhanced by codoping with Li{sup +} ions. The enhancement of the luminescent intensity can be the consequence of the modification of the local field symmetry around the Eu{sup 3+} ion, improved crystallization, and the enlarged grain size induced by the Li{sup +} ions.« less

Authors:
 [1]; ; ; ; ; ;  [1];  [2]
  1. School of Sciences, Chongqing University of Posts and Telecommunications, Chongqing 400065 (China)
  2. Department of Physics, University of Science and Technology of China, Hefei 230026 (China)
Publication Date:
OSTI Identifier:
22581551
Resource Type:
Journal Article
Resource Relation:
Journal Name: Materials Research Bulletin; Journal Volume: 78; Other Information: Copyright (c) 2016 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ABSORPTION SPECTRA; CONCENTRATION RATIO; CRYSTAL STRUCTURE; CRYSTALLIZATION; CRYSTALS; DOPED MATERIALS; EMISSION SPECTRA; EUROPIUM IONS; GRAIN SIZE; LITHIUM IONS; LUMINESCENCE; LUTETIUM COMPOUNDS; MOLYBDATES; MONOCLINIC LATTICES; PHOSPHORS; ULTRAVIOLET RADIATION; X-RAY DIFFRACTION

Citation Formats

Li, Li, E-mail: lilic@cqupt.edu.cn, Shen, Jun, Pan, Yu, Zhou, Xianju, Huang, He, Chang, Wenxuan, He, Qiwei, and Wei, Xiantao. Enhancing luminescence of Lu{sub 2}MoO{sub 6}:Eu{sup 3+} phosphors by doping with Li{sup +} ions for near ultraviolet based solid state lighting. United States: N. p., 2016. Web. doi:10.1016/J.MATERRESBULL.2016.02.006.
Li, Li, E-mail: lilic@cqupt.edu.cn, Shen, Jun, Pan, Yu, Zhou, Xianju, Huang, He, Chang, Wenxuan, He, Qiwei, & Wei, Xiantao. Enhancing luminescence of Lu{sub 2}MoO{sub 6}:Eu{sup 3+} phosphors by doping with Li{sup +} ions for near ultraviolet based solid state lighting. United States. doi:10.1016/J.MATERRESBULL.2016.02.006.
Li, Li, E-mail: lilic@cqupt.edu.cn, Shen, Jun, Pan, Yu, Zhou, Xianju, Huang, He, Chang, Wenxuan, He, Qiwei, and Wei, Xiantao. Wed . "Enhancing luminescence of Lu{sub 2}MoO{sub 6}:Eu{sup 3+} phosphors by doping with Li{sup +} ions for near ultraviolet based solid state lighting". United States. doi:10.1016/J.MATERRESBULL.2016.02.006.
@article{osti_22581551,
title = {Enhancing luminescence of Lu{sub 2}MoO{sub 6}:Eu{sup 3+} phosphors by doping with Li{sup +} ions for near ultraviolet based solid state lighting},
author = {Li, Li, E-mail: lilic@cqupt.edu.cn and Shen, Jun and Pan, Yu and Zhou, Xianju and Huang, He and Chang, Wenxuan and He, Qiwei and Wei, Xiantao},
abstractNote = {Graphical abstract: The emission spectra of Lu{sub 2}MoO{sub 6}:3%Eu{sup 3+}, x%Li{sup +} phosphors under 365 nm excitation. The inset represents emission intensity of 610 nm as a function of Li{sup +} molar concentration. - Highlights: • Lu{sub 2}MoO{sub 6}:3%Eu{sup 3+}, x%Li{sup +} phosphors were synthesized by solid-state reaction method. • All the prepared phosphors can be assigned to its monoclinic phase. • The optimal concentration of Li{sup +} ions is 30mol%. • The luminescent intensity of Lu{sub 2}MoO{sub 6}:Eu{sup 3+} phosphors has been greatly enhanced by codoping Li{sup +} ions. - Abstract: Lu{sub 2}MoO{sub 6}: 3% Eu{sup 3+} co-doped with x% Li{sup +} (x = 0–40 mol) phosphors were synthesized by high-temperature solid-state reaction method. The structure and luminescent properties of these phosphors were investigated. The X-ray diffraction (XRD) results show that all prepared phosphors can be assigned to monoclinic phase and codoping with Li{sup +} ions does not change their crystallographic structure. The excitation and emission spectra show that the samples can be effectively excited by the near ultraviolet light at 365 nm and exhibit strong red emission centered at 610 nm. The experimental results indicate the red luminescent intensity of Lu{sub 2}MoO{sub 6}:Eu{sup 3+} phosphors has been greatly enhanced by codoping with Li{sup +} ions. The enhancement of the luminescent intensity can be the consequence of the modification of the local field symmetry around the Eu{sup 3+} ion, improved crystallization, and the enlarged grain size induced by the Li{sup +} ions.},
doi = {10.1016/J.MATERRESBULL.2016.02.006},
journal = {Materials Research Bulletin},
number = ,
volume = 78,
place = {United States},
year = {Wed Jun 15 00:00:00 EDT 2016},
month = {Wed Jun 15 00:00:00 EDT 2016}
}
  • The Ba{sub 2}GdNbO{sub 6}: Eu{sup 3+}/Dy{sup 3+} and Li{sup +}-doped Ba{sub 2}GdNbO{sub 6}: Eu{sup 3+}/Dy{sup 3+} phosphors were prepared by solid-state reaction process. X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM) and photoluminescence (PL) as well as lifetimes, was utilized to characterize the resulting phosphors. Under the excitation of ultraviolet light, the Ba{sub 2}GdNbO{sub 6}: Eu{sup 3+}/Dy{sup 3+} and Li{sup +}-doped Ba{sub 2}GdNbO{sub 6}: Eu{sup 3+}/Dy{sup 3+} show the characteristic emissions of Eu{sup 3+} ({sup 5}D{sub 0}-{sup 7}F{sub 1,2,3} transitions dominated by {sup 5}D{sub 0}-{sup 7}F{sub 1} at 593 nm) and Dy{sup 3+} ({sup 4}F{sub 9/2}-{sup 6}H{sub 15/2},{sub 13/2}more » transitions dominated by {sup 4}F{sub 9/2}-{sup 6}H{sub 15/2} at 494 nm), respectively. The incorporation of Li{sup +} ions into the Ba{sub 2}GdNbO{sub 6}: Eu{sup 3+}/Dy{sup 3+} phosphors has enhanced the PL intensities depending on the doping concentration of Li{sup +}, and the highest emission was obtained in Ba{sub 2}Gd{sub 0.9}NbO{sub 6}: 0.10Eu{sup 3+}, 0.01Li{sup +} and Ba{sub 2}Gd{sub 0.95}NbO{sub 6}: 0.05Dy{sup 3+}, 0.07Li{sup +}, respectively. An energy level diagram was proposed to explain the luminescence process in the phosphors. - Graphical abstract: The Ba{sub 2}GdNbO{sub 6}: Eu{sup 3+}/Dy{sup 3+} and Li{sup +}-doped Ba{sub 2}GdNbO{sub 6}: Eu{sup 3+}/Dy{sup 3+} phosphors were prepared by solid-state reaction. The incorporation of Li{sup +} ions into the Ba{sub 2}GdNbO{sub 6}: Eu{sup 3+}/Dy{sup 3+} phosphors has enhanced the photoluminescence intensities of Eu{sup 3+} and Dy{sup 3+}, depending on the doping concentration of Li{sup +}.« less
  • Red phosphors gadolinium tungstate and molybdate with the formula Gd{sub (2-x)}MO{sub 6}:Eu{sub x}{sup 3+} (M=Mo, W) were successfully synthesized by the solid-state reaction at 900 and 1300 deg. C for 4 h, respectively. The products were characterized by an X-ray powder diffractometer (XRD), TG-DSC, FT-IR, PL, UV-vis and SEM. Room-temperature photoluminescence indicated that the as-prepared Gd{sub (2-x)}MO{sub 6}:Eu{sub x}{sup 3+} (M=Mo, W) had a strong red emission, which is due to the characteristic transitions of Eu{sup 3+} ({sup 5}D{sub 0}{yields}{sup 7}F{sub J}, J=0, 1, 2, 3, 4) for these phosphors. Meanwhile, the {sup 5}D{sub 0}{yields}{sup 7}F{sub 2} is in themore » dominant position. The emission quantum efficiency of Eu{sup 3+} in the Gd{sub (2-x)}MO{sub 6}:Eu{sub x}{sup 3+} (M=Mo, W) system has been investigated. The XRD results indicate that both Gd{sub 2}WO{sub 6} and Gd{sub 2}MoO{sub 6} belong to the monoclinic system with space group C2/c [A. Bril, G. Blasse, J. Chem. Phys. 45 (1966) 2350-2356] and I2/a [A. Bril, G. Blasse, J. Chem. Phys. 45 (1966) 2350-2356], respectively. SEM images indicate that the shape of Gd{sub 1.96}WO{sub 6}:Eu{sub 0.04}{sup 3+} is aggregated small particles with a mean diameter of about 300 nm, and the shape of Gd{sub 1.96}MoO{sub 6}:Eu{sub 0.04}{sup 3+} is block-like structures. - Graphical abstract: Excellent red phosphors gadolinium tungstate and molybdate with the formula Gd{sub (2-x)}MO{sub 6}:Eu{sub x}{sup 3+} (M = Mo, W) were synthesized by the conventional solid-state reaction at 900 and 1300deg. C for 4 h, respectively. SEM imagines indicate that the morphology of Gd{sub 1.96}WO{sub 6}:Eu{sup 3+}{sub 0.04} has 3D micro-pore network structures better than the block-like Gd{sub 1.96}MoO{sub 6}:Eu{sup 3+}{sub 0.04}. Their quantum efficiency has been investigated.« less
  • The g-C{sub 3}N{sub 4}/Y{sub 2}MoO{sub 6}:Eu{sup 3+} composite phosphors were synthesized and characterized by X-ray diffraction, Fourier transform-infrared spectroscopy, ultraviolet visible diffuse reflection spectra, photoluminescence spectra and luminescence decay curves. Under the excitation of 360 nm near ultraviolet light, these composite phosphors show tunable emission from blue to red region, in which white light emission can be obtained in term of appropriate quality proportion of Y{sub 2}MoO{sub 6}:Eu{sup 3+} relative to g-C{sub 3}N{sub 4}/Y{sub 2}MoO{sub 6}:Eu{sup 3+}. In addition, the emission color can be also dependent on the excitation wavelength in g-C{sub 3}N{sub 4}/Y{sub 2}MoO{sub 6}:Eu{sup 3+} composite phosphor. -more » Graphical abstract: Under the excitation of 360 nm near ultraviolet light, the g-C{sub 3}N{sub 4}/Y{sub 2}MoO{sub 6}:Eu{sup 3+} composite phosphors show tunable emission from blue to red region, in which white light emission can be obtained. - Highlights: • The g-C3N4/Y2MoO6:Eu{sup 3+} composite phosphors were synthesized and characterized. • White light emission was realized in the g-C3N4/Y2MoO6:Eu{sup 3+} composites under UV excitation. • A novel idea to realize the broadband sensitized white light emission in phosphors was provided.« less
  • Optical spectra of the compounds of the type Ln/sub 2/MO/sub 6/ (M = Mo, W; Ln = La-Lu) were investigated. There are two luminescence centers of Eu/sup 3 +/, differing in the polarizing action of the nonequivalent oxygen atoms in the 4f shell. Analysis of the crystalline field parameters along the crystallochemical series reveals that the monoclinic distortion increases as the ionic radius of the rare earth decreases. It is shown that oxygen atoms at the vertices of the octahedra and tetrahedra are shifted toward the rare earth ion to a greater extent than the oxygen atoms in the Mo(W)more » plane. The nonequivalence of the oxygen atoms plays a leading part in the monoclinic distortion of the structure.« less