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Title: Photoluminescence properties of a novel phosphor, Na{sub 3}La{sub 9}O{sub 3}(BO{sub 3}){sub 8}:RE {sup 3+}(RE=Eu,Tb)

Abstract

The new oxyborate phosphors, Na{sub 3}La{sub 9}O{sub 3}(BO{sub 3}){sub 8}:Eu{sup 3+} (NLBO:Eu) and Na{sub 3}La{sub 9}O{sub 3}(BO{sub 3}){sub 8}:Tb{sup 3+} (NLBO:Tb) were prepared by solid-state reactions. The photoluminescence characteristics under UV excitation were investigated. The dominated emission of Eu{sup 3+} corresponding to the electric dipole transition {sup 5} D {sub 0}{sup {yields}}{sup 7} F {sub 2} is located at 613 nm and bright green luminescence of NLBO:Tb attributed to the transition {sup 5} D {sub 4}{sup {yields}}{sup 7} F {sub 5} is centered at 544 nm. The concentration dependence of the emission intensity showed that the optimum doping concentration of Eu and Tb is 30% and 10%, respectively. - Graphical abstract: The dominated emission of NLBO:Eu located at 613 nm is from the electric dipole transition {sup 5} D {sub 0}{sup {yields}}{sup 7} F {sub 2}. NLBO:Tb emit bright green luminescence centered at 544 nm attributed to the transition {sup 5} D {sub 4}{sup {yields}}{sup 7} F {sub 5}. The concentration dependence of the emission intensity showed that the optimum doping concentration of Eu and Tb is 30% and 10%, respectively.

Authors:
 [1];  [2];  [1];  [3]
  1. Technical Institute of Physics and Chemistry, Chinese Academy of Science, Beijing 100080 (China)
  2. (China)
  3. Technical Institute of Physics and Chemistry, Chinese Academy of Science, Beijing 100080 (China), E-mail: pzfu@cl.cryo.ac.cn
Publication Date:
OSTI Identifier:
21015839
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Solid State Chemistry; Journal Volume: 180; Journal Issue: 5; Other Information: DOI: 10.1016/j.jssc.2007.03.027; PII: S0022-4596(07)00139-9; Copyright (c) 2007 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:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; BORATES; E1-TRANSITIONS; EUROPIUM COMPOUNDS; EUROPIUM IONS; LANTHANUM COMPOUNDS; PHOSPHORS; PHOTOLUMINESCENCE; TERBIUM COMPOUNDS; TERBIUM IONS

Citation Formats

Bai Xiaoyan, Graduate School of Chinese Academy of Sciences, Beijing 100039, Zhang Guochun, and Fu Peizhen. Photoluminescence properties of a novel phosphor, Na{sub 3}La{sub 9}O{sub 3}(BO{sub 3}){sub 8}:RE {sup 3+}(RE=Eu,Tb). United States: N. p., 2007. Web.
Bai Xiaoyan, Graduate School of Chinese Academy of Sciences, Beijing 100039, Zhang Guochun, & Fu Peizhen. Photoluminescence properties of a novel phosphor, Na{sub 3}La{sub 9}O{sub 3}(BO{sub 3}){sub 8}:RE {sup 3+}(RE=Eu,Tb). United States.
Bai Xiaoyan, Graduate School of Chinese Academy of Sciences, Beijing 100039, Zhang Guochun, and Fu Peizhen. Tue . "Photoluminescence properties of a novel phosphor, Na{sub 3}La{sub 9}O{sub 3}(BO{sub 3}){sub 8}:RE {sup 3+}(RE=Eu,Tb)". United States. doi:.
@article{osti_21015839,
title = {Photoluminescence properties of a novel phosphor, Na{sub 3}La{sub 9}O{sub 3}(BO{sub 3}){sub 8}:RE {sup 3+}(RE=Eu,Tb)},
author = {Bai Xiaoyan and Graduate School of Chinese Academy of Sciences, Beijing 100039 and Zhang Guochun and Fu Peizhen},
abstractNote = {The new oxyborate phosphors, Na{sub 3}La{sub 9}O{sub 3}(BO{sub 3}){sub 8}:Eu{sup 3+} (NLBO:Eu) and Na{sub 3}La{sub 9}O{sub 3}(BO{sub 3}){sub 8}:Tb{sup 3+} (NLBO:Tb) were prepared by solid-state reactions. The photoluminescence characteristics under UV excitation were investigated. The dominated emission of Eu{sup 3+} corresponding to the electric dipole transition {sup 5} D {sub 0}{sup {yields}}{sup 7} F {sub 2} is located at 613 nm and bright green luminescence of NLBO:Tb attributed to the transition {sup 5} D {sub 4}{sup {yields}}{sup 7} F {sub 5} is centered at 544 nm. The concentration dependence of the emission intensity showed that the optimum doping concentration of Eu and Tb is 30% and 10%, respectively. - Graphical abstract: The dominated emission of NLBO:Eu located at 613 nm is from the electric dipole transition {sup 5} D {sub 0}{sup {yields}}{sup 7} F {sub 2}. NLBO:Tb emit bright green luminescence centered at 544 nm attributed to the transition {sup 5} D {sub 4}{sup {yields}}{sup 7} F {sub 5}. The concentration dependence of the emission intensity showed that the optimum doping concentration of Eu and Tb is 30% and 10%, respectively.},
doi = {},
journal = {Journal of Solid State Chemistry},
number = 5,
volume = 180,
place = {United States},
year = {Tue May 15 00:00:00 EDT 2007},
month = {Tue May 15 00:00:00 EDT 2007}
}
  • In the present work, we have synthesized maleevite mineral phase BaB{sub 2}Si{sub 2}O{sub 8} for the first time, which is isostructural with the pekovite mineral SrB{sub 2}Si{sub 2}O{sub 8}. In these europium doped host lattices, we observed the partial reduction of Eu{sup 3+} to Eu{sup 2+} at high temperature during the synthesis in air. Tb{sup 3+} co-doping in MB{sub 2}Si{sub 2}O{sub 8}:0.01(Eu{sup 3+}/Eu{sup 2+}) [M=Sr, Ba] improves the emission properties towards white light. The emission color varies from bluish white to greenish white under UV lamp excitation when the host cation changes from Sr to Ba. - Graphical abstract: Themore » figure shows structure refinement of both MB{sub 2}Si{sub 2}O{sub 8} [M=Sr, Ba]. The structure refinement of newly synthesized phase BaB{sub 2}Si{sub 2}O{sub 8} was carried out by taking SrB{sub 2}Si{sub 2}O{sub 8} as starting structure model. Inset in the figure shows the structure projection of BaB{sub 2}Si{sub 2}O{sub 8}. The Sr{sup 2+}/Ba{sup 2+} are embedded in polyanionic network formed by corner sharing BO{sub 4}{sup 5-} and SiO{sub 4}{sup 4-} tetrahedral that intern form interconnected layers of 4 and 8 membered rings perpendicular to b-axis.« less
  • Using Na{sub 2}CO{sub 3}-H{sub 3}BO{sub 3}-NaF as fluxes, transparent RE:Na{sub 3}La{sub 9}O{sub 3}(BO{sub 3}){sub 8} (abbr. RE:NLBO, RE=Er, Yb) crystals have been grown by the top seed solution growth (TSSG) method. The X-ray powder diffraction analysis shows that the RE:NLBO crystals have the same structure with NLBO. The element contents were determined by molar to be 0.64% Er{sup 3+} in Er:NLBO, 2.70% Yb{sup 3+} in Yb:NLBO, respectively. The polarized absorption spectra of RE:NLBO have been measured at room temperature and show that both Er:NLBO and Yb:NLBO have a strong absorption bands near 980 nm with wide FWHM (Full Wave atmore » Half Maximum) (21 nm for Er:NLBO and 25 nm for Yb:NLBO). Fluorescence spectra have been recorded. Yb:NLBO has the emission peaks at 985 nm, 1028 nm and 1079 nm and the emission peak of Er:NLBO is at 1536 nm. Spectral parameters have been calculated by the Judd-Ofelt theory for Er:NLBO and the reciprocity method for Yb:NLBO, respectively. The calculated values show that Er:NLBO is a candidate of 1.55 {mu}m laser crystals and Yb:NLBO is a candidate for self-frequency doubling crystal. - Graphical abstract: Fluorescence spectra show the emission peaks at 985, 1028 and 1079 nm of Yb:NLBO and at 1536 nm of Er:NLBO.« less
  • The comparative study of the structure and photoluminescence (PL) properties of the Eu{sup 3+} and Tb{sup 3+} activated Na{sub 3}Ln(BO{sub 3}){sub 2}, with Ln=Y, Gd, showed the important role of the host lattice structure upon PL. Higher emission intensities of Eu{sup 3+} and Tb{sup 3+} are observed for Na{sub 3}Gd(BO{sub 3}){sub 2} than for Na{sub 3}Y(BO{sub 3}){sub 2}, through direct Eu{sup 3+} excitation at 395 nm for Eu{sup 3+} doped borates, and through Gd{sup 3+} excitation around 280 nm for Tb{sup 3+} doped borates. This higher performance for Na{sub 3}Gd(BO{sub 3}){sub 2} is due to the less regular environment ofmore » Eu{sup 3+} (Tb{sup 3+}) in the Gd sites than in the Y sites and to energy transfer from Gd{sup 3+} to Eu{sup 3+}(Tb{sup 3+}). The smaller critical concentration in Na{sub 3}Ln{sub 1-x}Tb{sub x}(BO{sub 3}){sub 2} observed for Ln=Gd, x=0.5, compared to x=0.6 for Ln=Y, is explained by shorter Ln-Ln distances (4.11 A for Gd-Gd vs. 4.59 A for Y-Y). Both Na{sub 3}Y{sub 0.4}Tb{sub 0.6}(BO{sub 3}){sub 2} and Na{sub 3}Gd{sub 0.5}Tb{sub 0.5}(BO{sub 3}){sub 2} show intense green emission under UV excitation. - Graphical abstract: The PL properties of Eu{sup 3+} and Tb{sup 3+} are studied in Na{sub 3}Ln(BO{sub 3}){sub 2} (Ln=Y, Gd) borates. Eu{sup 3+} and Tb{sup 3+}exhibits higher emission intensity in Na{sub 3}Gd(BO{sub 3}){sub 2} compared to Na{sub 3}Y(BO{sub 3}){sub 2} due to the less regular environment of the Gd{sup 3+} ion. Energy transfer from Gd{sup 3+} to Tb{sup 3+} is observed. Highlights: Black-Right-Pointing-Pointer Crystal structure of Na{sub 3}Gd(BO{sub 3}){sub 2} by X-ray powder diffraction. Black-Right-Pointing-Pointer Photoluminescence properties of Eu{sup 3+} and Tb{sup 3+} doped Na{sub 3}Ln(BO{sub 3}){sub 2} (Ln=Y, Gd). Black-Right-Pointing-Pointer Higher Eu{sup 3+} and Tb{sup 3+} emission for Na{sub 3}Gd(BO{sub 3}){sub 2} due to an irregular environment of Gd{sup 3+}. Black-Right-Pointing-Pointer Higher Eu{sup 3+} and Tb{sup 3+} emission for Na{sub 3}Gd(BO{sub 3}){sub 2} due to energy transfer from Gd{sup 3+}. Black-Right-Pointing-Pointer Lower Tb{sup 3+} critical concentration for Na{sub 3}Gd(BO{sub 3}){sub 2} due to short Gd{sup 3+}-Gd{sup 3+} distances.« less
  • Three rare earth borosilicate oxyapatites, RE {sub 5}Si{sub 2}BO{sub 13} (RE=La, Gd, Y), were synthesized via wet chemical method, of which RE {sub 5}Si{sub 2}BO{sub 13} (RE=Gd, Y) were first reported in this work. In the three oxyapatites, [BO{sub 4}] and [SiO{sub 4}] share the [TO{sub 4}] tetrahedral oxyanion site, and RE {sup 3+} ions occupy all metal sites. The differential scanning calorimetry-thermo gravimetry measurements and high temperature powder X-ray diffraction pattern revealed a vitrification process within 300-1200 deg. C, which was due to the glass-forming nature of borosilicates. From the VUV excitation spectra of Eu{sup 3+} and Tb{sup 3+}more » in RE {sub 5}Si{sub 2}BO{sub 13}, the optical band gaps were found to be 6.31, 6.54 and 6.72 eV for RE {sub 5}Si{sub 2}BO{sub 13} (RE=La, Gd, Y), respectively. The emission and excitation bands of Eu{sup 3+} and Tb{sup 3+} are discussed relating with their coordination environments. Among the three hosts, Y{sub 5}Si{sub 2}BO{sub 13} would be the best for Eu{sup 3+} and Tb{sup 3+}-doped phosphors. - Graphical abstract: The perspective view of RE {sub 5}Si{sub 2}BO{sub 13} (RE=La, Gd, Y) oxyapatite along [001] direction. All non-tetrahedral metal sites are occupied by RE {sup 3+}, and the tetrahedral sites by SiO{sub 4} and BO{sub 4} groups. Y{sub 5}Si{sub 2}BO{sub 13} is a good host for both Eu{sup 3+} and Tb{sup 3+} activated phosphors.« less
  • Highlights: ► NaLa{sub 1−x}MgWO{sub 6}:xRE{sup 3+} phosphors were synthesized by solid-state reaction method. ► Compared with Y{sub 2}O{sub 3}:Eu{sup 3+}, NaLaMgWO{sub 6}:Eu{sup 3+} performed better luminescence properties. ► The results demonstrated NaLaMgWO{sub 6} as a suitable host for RE{sup 3+}-doping. -- Abstract: Single phase of NaLa{sub 1−x}MgWO{sub 6}:xRE{sup 3+} (0 < x ≤1) (RE = Eu, Sm, Tb) phosphors were prepared by solid-state reaction method. X-ray diffraction, scanning electron microscopy, the morphology energy-dispersive X-ray spectroscopy, UV–vis diffuse reflectance spectra and photoluminescence were used to characterize the samples. Under the light excitation, NaLaMgWO{sub 6}:Eu{sup 3+}, NaLaMgWO{sub 6}:Sm{sup 3+} and NaLaMgWO{sub 6}:Tb{supmore » 3+}, phosphors showed the characteristic emissions of Eu{sup 3+} ({sup 5}D{sub 0} → {sup 7}F{sub 4,3,2,1}), Sm{sup 3+} ({sup 4}G{sub 5/2} → {sup 6}H{sub 5/2,7/2,9/2}), and Tb{sup 3+} ({sup 5}D{sub 4} → {sup 7}F{sub 6,5,4,3}), respectively. The intensity of the red emission for Na(La{sub 0.6}Eu{sub 0.4})MgWO{sub 6} is 2.5 times higher than that of (Y{sub 0.95}Eu{sub 0.05}){sub 2}O{sub 3} under blue light irradiation. The quantum efficiencies of the entitled phosphors excited under 394 nm and 464 nm are also investigated and compared with commercial phosphors Y{sub 2}O{sub 3}:Eu{sup 3+}, Sr{sub 2}Si{sub 5}N{sub 8}:Eu{sup 2+} and Y{sub 3}A{sub 5}G{sub 12}:Ce{sup 3+}. The results demonstrated NaLaMgWO{sub 6}:RE{sup 3+} phosphors as potential candidates for white light emitting diode pumped by UV or blue chip.« less