A red-emitting heavy doped phosphor Li6Y(BO3)3:Eu3+ for white light-emitting diodes

Ju, Guifang; Hu, Yihua; Wu, Haoyi; Yang, Zhongfu; Fu, Chu-Jun; Mu, Zhongfei; Kang, Fengwen

doi:10.1016/j.optmat.2011.03.002

Cited by 64 publications

(37 citation statements)

References 54 publications

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“…Concentration quenching can be increased if some big anion groups are incorporated into a matrix in which the Eu 3+ ions do not share any O 2− ions. 42 Pyrochlore structure can be treated as Figure 6. Observed (points), calculated (continuous line), and difference I obsd − I calcd (bottom line) profiles obtained after Rietveld refinement of Ca 0.8 Sr 0.2 Gd 0.9 SnNbO 7 :0.1Eu 3+ using GSAS program.…”

Section: Resultsmentioning

confidence: 99%

Influence of Cation Substitution and Activator Site Exchange on the Photoluminescence Properties of Eu³⁺-Doped Quaternary Pyrochlore Oxides

et al. 2013

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Stannate-based pyrochlore-type red phosphors CaGd(1-x)SnNbO7:xEu(3+), Ca(1-y)Sr(y)Gd(1-x)SnNbO7:xEu(3+), and Ca(0.8-x)Sr0.2GdSnNbO(7+δ): xEu(3+) were prepared via conventional solid-state method. Influence of cation substitution and activator site control on the photoluminescence properties of these phosphors are elucidated using powder X-ray diffraction, Rietveld analysis, Raman spectrum analysis, and photoluminescence excitation and emission spectra. The Eu(3+) luminescence in quaternary pyrochlore lattice exemplifies as a very good structural probe for the detection of short-range disorder in the lattice, which otherwise is not detected by normal powder X-ray diffraction technique. The Eu(3+) emission due to magnetic dipole transition ((5)D0-(7)F1 MD) is modified with the increase in europium concentration in the quaternary pyrochlore red phosphors. (5)D0-(7)F1 MD transition splitting is not observable for low Eu(3+) doping because of the short-range disorder in the pyrochlore lattice. Appearance of narrow peaks in Raman spectra confirms that short-range disorder in the crystal lattice disappears with progressive europium doping. By using Sr as a network modifier ion in place of Ca we were able to increase the f-f transition intensities and europium quenching concentration. The influence of effective positive charge of the central Eu(3+) ions when it replaces a metal ion having lower oxidation state such as Ca(2+) was also investigated. The relative intensities of A1g (∼500 cm(-1)) and F2g (∼330 cm(-1)) Raman vibrational modes get inverted when Eu(3+) ions replaces Ca(2+) ions instead of Gd(3+) as trivalent europium ions can attract the electron cloud of oxygen ions strongly in comparison with divalent calcium ions. The influence of positive charge effect of Eu(3+) in Ca0.7Sr0.2GdSnNbO7+δ:0.1Eu(3+) phosphor is greatly strengthened the charge transfer band and (7)F0-(5)L6 transition intensities than that of the Ca0.8Sr0.2Gd0.9SnNbO7:0.1Eu(3+) phosphor. Our results suggest that the photoluminescence properties can be enhanced by simple compositional adjustments in the quaternary pyrochlore-type red phosphors.

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Section: Resultsmentioning

confidence: 99%

Influence of Cation Substitution and Activator Site Exchange on the Photoluminescence Properties of Eu³⁺-Doped Quaternary Pyrochlore Oxides

et al. 2013

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“…The comparison shows that the XRD peaks positions are similar to that of LGBO and LYBO crystals with a very slight shift in few peaks position. It confirms that the grown LYGBO crystal possess similar phase as that of LGBO and LYBO having monoclinic structure with P2 1 /c space group [29,37]. A slight mismatch in the peak positions is expected and is supposed to be the cause of difference in the radii of gadolinium (Gd, 1.15 Å) and Yttrium (Y, 1.04 Å) ions; however, such minor shift in peaks is hard to notice in Fig.…”

Section: Characterizationmentioning

confidence: 52%

Scintillation properties of Li6Y0.5Gd0.5(BO3)3: Ce3+ single crystal

Fawad

Rooh

Kim

et al. 2015

Journal of Crystal Growth

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“…Recently, rare-earth doped inorganic phosphors play vital role in optoelectronic devices such as plasma display panel, light emitting diodes and thermo-graphic sensors [1][2][3]. In phosphor converted-LED lighting technology, the phosphors serve as a potential candidate for the generation of white light [4].…”

Section: Introductionmentioning

confidence: 99%

Phase formation and photoluminescence properties of Sm3+ doped Al5BO9 phosphor

Kumar

Ponnusamy

2015

Optik

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A red-emitting heavy doped phosphor Li6Y(BO3)3:Eu3+ for white light-emitting diodes

Cited by 64 publications

References 54 publications

Influence of Cation Substitution and Activator Site Exchange on the Photoluminescence Properties of Eu³⁺-Doped Quaternary Pyrochlore Oxides

Influence of Cation Substitution and Activator Site Exchange on the Photoluminescence Properties of Eu³⁺-Doped Quaternary Pyrochlore Oxides

Scintillation properties of Li6Y0.5Gd0.5(BO3)3: Ce3+ single crystal

Phase formation and photoluminescence properties of Sm3+ doped Al5BO9 phosphor

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A red-emitting heavy doped phosphor Li6Y(BO3)3:Eu3+ for white light-emitting diodes

Cited by 64 publications

References 54 publications

Influence of Cation Substitution and Activator Site Exchange on the Photoluminescence Properties of Eu3+-Doped Quaternary Pyrochlore Oxides

Influence of Cation Substitution and Activator Site Exchange on the Photoluminescence Properties of Eu3+-Doped Quaternary Pyrochlore Oxides

Scintillation properties of Li6Y0.5Gd0.5(BO3)3: Ce3+ single crystal

Phase formation and photoluminescence properties of Sm3+ doped Al5BO9 phosphor

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Influence of Cation Substitution and Activator Site Exchange on the Photoluminescence Properties of Eu³⁺-Doped Quaternary Pyrochlore Oxides

Influence of Cation Substitution and Activator Site Exchange on the Photoluminescence Properties of Eu³⁺-Doped Quaternary Pyrochlore Oxides