Matrix-induced synthesis and photoluminescence of M2RENbO6: Eu3+ (M=Ca, Sr, Ba; RE = Y, Gd, La) phosphors by hybrid precursors

Xiao, Xiu Zhen; Yan, Bing

doi:10.1016/j.jallcom.2006.06.058

Cited by 18 publications

(4 citation statements)

References 40 publications

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“…The spectral resolution is not adequate for band assignments of crystal field levels. The emission spectra (Figure 4b) exhibit maximum intensity at ∼595 nm and differ considerably from those reported by Xiao and Yan 33 but are consistent with the emission spectrum of Blasse et al 4 and Yu et al 34 The room temperature charge transfer excitation and emission bands of Ba 2 YNbO 6 and Ba 2 YTaO 6 have been reported at 314, 263 nm (excitation) and 530, 390 nm (emission), respectively. 13 The maxima in the room temperature excitation spectra (Figure 3a) are at 262 nm and 277, 305 nm, respectively for Ta−O and Nb−O charge transfer bands, but the corresponding emission bands are almost quenched via energy transfer to Eu 3+ .…”

Section: ■ Experimental Sectionsupporting

confidence: 86%

Double Perovskite Structure: A Vibrational and Luminescence Investigation Providing a Perspective on Crystal Field Strength

Ning

Tanner

2012

J. Phys. Chem. A

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The luminescence spectra of Eu(3+) doped in a series of double perovskite lattices Ba(2)LnMO(6) (Ln = Y, Gd; M = Nb, Ta) have been recorded at room temperature and 10 K. Together with FT-IR and FT-Raman spectra and aided by DFT vibrational energy calculations, assignments have been made for the crystal field levels of the (5)D(J) (J = 0,1) and (7)F(J) (J = 0-2) multiplets. The luminescence spectra are consistent with monoclinic symmetry of these systems. The crystal field parameters from the fitting of the energy level data set of Ba(2)YNbO(6):Eu(3+) enable the crystal field strength to be calculated, and the order of magnitude is Cl(-) < O(2-) < F(-) for the EuX(6)(n-) (n = 6 for halogen, 9 for oxide) moieties. For these systems, an empirical linear relationship between crystal field strength and electronegativity of ligand X has been found. By contrast, the nephelauxetic series from the depression of the Slater parameter F(2) is Cl(-) ≈ O(2-) > F(-) > free ion for these systems.

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Section: ■ Experimental Sectionsupporting

confidence: 86%

Double Perovskite Structure: A Vibrational and Luminescence Investigation Providing a Perspective on Crystal Field Strength

Ning

Tanner

2012

J. Phys. Chem. A

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“…A simulation of the spectral embedded EuO 6 9− cluster in this host lattice gave poor agreement with experiment . Other reports of the luminescence of Ba 2 LaNbO 6 :Eu 3+ and Ba 2 GdNbO 6 :Eu 3+ have been recorded at low resolution so that spectral features are not resolved. Although Ba 2 GdNbO 6 and Ba 2 LaNbO 6 were at one time considered to crystallize in the Fm 3̅ m system, more sensitive investigations have shown the respective space groups to be tetragonal I 4/ m and monoclinic I 2/ m , respectively, at ambient temperatures.…”

Section: Resultsmentioning

confidence: 77%

“…Blasse et al employed room-temperature luminescence to investigate the site symmetry of Eu 3+ in Ba 2 GdNbO 6 and concluded that Eu 3+ is situated at a site of octahedral symmetry. Conflicting reports of concentration quenching have been reported for this system, , and evidently Li + codoping increases the photoluminescence intensity . Qi et al reported that the emission spectrum of Nd 3+ in Ba 2 NdNbO 6 is broadened by crystal disorder.…”

Section: Introductionmentioning

confidence: 86%

Luminescence Properties of Lanthanide and Transition Metal Ion-Doped Ba₂LaNbO₆: Detection of MnO₆⁸⁻ and CrO₆⁹⁻ Clusters

Tanner

Pan

2009

Inorg. Chem.

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The as-prepared double-perovskite Ba(2)LaNbO(6) (space group I2/m at ambient temperatures) exhibited an unexpected well-resolved red luminescence, which was found to arise from parts-per-million impurity of Mn(4+). The ions Mn(4+) or Cr(3+) doped into this host are situated at Nb(5+) sites with slightly distorted octahedral symmetry, with the distortion greater for the case of greater charge mismatch. The Stokes luminescence spectra of the dopant ions comprise nu(3), nu(4), and nu(6) moiety mode vibronic origins, and the high vibrational frequency ratio nu(4)/nu(3) signals the stiffness of the O-M-O (M = Mn, Cr) angle in the double perovskite. The site symmetry at the La(3+) site of lanthanide ions doped into Ba(2)LaNbO(6) comprises a 2-fold axis at most. All dopant ions exhibit concentration quenching in this lattice.

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“…The computed energy bandgap of the host material indicates there was sufficient bandgap to accommodate the luminescent center within the host material. [ 37,38 ] The bandgap energies reduced from 4.043 to 3.928 eV. Because of the slight change in the activator concentration and lower particle size, the optical bandgap shifted.…”

Section: Resultsmentioning

confidence: 99%

Color‐Tunable Eu³⁺, Eu²⁺‐Activated CaSiO₃ Nano Phosphor Extract from Agricultural‐Recycling‐Food‐Waste Materials for Display Applications

Raju

Samudrala

Yadav

et al. 2023

Advanced Photonics Research

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A series of Eu3+ and Eu2+ doped wollastonite is produced with a modified sol–gel technique using agricultural‐food waste materials. Rice husk ash (RHA) and eggshell (ES) are used as an usher for silica and calcium oxide, appropriately, at different concentrations (0.0, 0.2, 0.4, 0.6, 0.8, and 1 mol%). Most investigations have documented photoluminescence (PL) from Eu3+ ions caused by electronic transitions between 4f levels (5D0 → 7FJ) but there is limited information on emissions from Eu2+ ions. Fourier transform infrared (FTIR) spectra and X‐ray diffraction (XRD) studies reveal that varying amounts of europium ions do not have any effect on the structure of the host. PL spectra display that europium ions exist in both trivalent and divalent forms. A valence change from Eu3+ to Eu2+ ion is investigated using luminescence measurements. As‐prepared Eu3+ activated β‐wollastonite emitted as red and reduction atmosphere using argon gas produced Eu2+ activated phosphor gives off blue light. X‐Ray photoelectron spectroscopy reveals that throughout the processing of the samples, Eu3+ cations are partially reduced to Eu2+ cations in argon gas atmosphere. These findings prove the feasibility of fabricating white light‐emitting diodes (white‐LEDs) for three‐band type (RGB) phosphors utilizing only one host crystal.

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Matrix-induced synthesis and photoluminescence of M2RENbO6: Eu3+ (M=Ca, Sr, Ba; RE = Y, Gd, La) phosphors by hybrid precursors

Cited by 18 publications

References 40 publications

Double Perovskite Structure: A Vibrational and Luminescence Investigation Providing a Perspective on Crystal Field Strength

Double Perovskite Structure: A Vibrational and Luminescence Investigation Providing a Perspective on Crystal Field Strength

Luminescence Properties of Lanthanide and Transition Metal Ion-Doped Ba₂LaNbO₆: Detection of MnO₆⁸⁻ and CrO₆⁹⁻ Clusters

Color‐Tunable Eu³⁺, Eu²⁺‐Activated CaSiO₃ Nano Phosphor Extract from Agricultural‐Recycling‐Food‐Waste Materials for Display Applications

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Matrix-induced synthesis and photoluminescence of M2RENbO6: Eu3+ (M=Ca, Sr, Ba; RE = Y, Gd, La) phosphors by hybrid precursors

Cited by 18 publications

References 40 publications

Double Perovskite Structure: A Vibrational and Luminescence Investigation Providing a Perspective on Crystal Field Strength

Double Perovskite Structure: A Vibrational and Luminescence Investigation Providing a Perspective on Crystal Field Strength

Luminescence Properties of Lanthanide and Transition Metal Ion-Doped Ba2LaNbO6: Detection of MnO68− and CrO69− Clusters

Color‐Tunable Eu3+, Eu2+‐Activated CaSiO3 Nano Phosphor Extract from Agricultural‐Recycling‐Food‐Waste Materials for Display Applications

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Luminescence Properties of Lanthanide and Transition Metal Ion-Doped Ba₂LaNbO₆: Detection of MnO₆⁸⁻ and CrO₆⁹⁻ Clusters

Color‐Tunable Eu³⁺, Eu²⁺‐Activated CaSiO₃ Nano Phosphor Extract from Agricultural‐Recycling‐Food‐Waste Materials for Display Applications