Mechanism of light emission and electronic properties of a Eu3+-doped Bi2SrTa2O9 system determined by coupled X-ray absorption and emission spectroscopy

Chan, Ting Shan; Dong, Chung Li; Chen, Yi Hauan; Lü, Ying; Wu, Sheng Yun; Ron, Yuan; Lin, Chun Che; Liu, Ru‐Shi; Chen, Jeng-Lung; Guo, Jinghua; Lee, Jyh Fu; Sheu, Hwo Shuenn; Yang, Chun; Chen, Chi Liang

doi:10.1039/c1jm11849h

Cited by 17 publications

(4 citation statements)

References 41 publications

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“…The intensity of electric dipole transition is stronger than that of magnetic dipole transition, which indicates that Eu 3+ occupies a noncentrosymmetric environment. 14,15 Usually, the width of Eu 3+ f-f transitions is ∼10 cm −1 . 11,16 It can be seen from Figure 2b that the width is wider (∼200 cm −1 ) than the usual value of Eu 3+ f-f transitions.…”

Section: Resultsmentioning

confidence: 99%

Luminescent Properties of Eu3+-Activated Fluorogermanate Based Red Phosphor with High Thermal Stability

Zhang

Yan

Yuan

et al. 2015

ECS Solid State Letters

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The luminescence of new Eu 3+ -activated Sr 4 Ge 2 O 7 F 2 phosphor is reported. The pronounced broadening of linewidth in this host lattice indicates that the Eu 3+ ions are distributed in four different Sr 2+ sites. Sr 4 Ge 2 O 7 F 2 :Eu 3+ shows weak concentration quenching. Sr 4 Ge 2 O 7 F 2 :Eu 3+ exhibits a good thermal stability with T 0.5 = 500 K. The results indicate this phosphor could find application in tricolor fluorescent lamp.Rare earths and transition metals have been used as dopants in germinate crystal and glass hosts to produce fluorescence in the visible and infrared regions of the spectrum. 1-5 For alkaline earth metal fluorogermanates, only the luminescent properties of Mn 4+ activated magnesium fluorogermanate were reported in literature. 6-8 However, the crystal structures of alkaline earth metal fluorogermanates have not been reported in literature. Recently, the crystal structure of the first alkaline earth metal fluorogermanate (Sr 4 Ge 2 O 7 F 2 ) has been proposed by Akella et al. 9 The optical properties of Eu 3+ have been investigated extensively due to their applications in the field of lighting and display. 10-13 Eu 3+ ion is usually used as a fluorescent probe to study the crystal structure of specific crystal. In general, the intense emission features are associated with the 5 D 0 → 7 F 1 transition (magnetic-dipole transition) and 5 D 0 → 7 F 2 transition (electric-dipole transition). If the Eu 3+ ion occupies a site lacking a center of symmetry, the 5 D 0 → 7 F 2 transition (red emission) is expected to predominate. This paper reports the emission and excitation spectra of Eu 3+ in the Sr 4 Ge 2 O 7 F 2 crystal at high temperatures together with an analysis of the thermal stability of this material. ExperimentalSr 4 Ge 2 O 7 F 2 :Eu 3+ phosphors were synthesized using solid state reaction. The materials used in this experiment were obtained from Sigma Aldrich. The following reactants with purity level of 99% were used: SrCO 3 , GeO 2 , SrF 2 and Eu 2 O 3 . In order to keep charge balance, K 2 CO 3 was added as a charge compensation material, and the number of moles of K 2 CO 3 and Eu 2 O 3 is the same. Prior to the high temperature reaction, the materials were weighed in stoichiometric and thoroughly mixed. The homogenized powders were transferred to crucibles and sintered at a box furnace in oxygen atmosphere at 950 • C for 5 h at a heating rate of 10 • C/min; then allowed to cool to room temperature with no temperature control. Phase impurity and optical properties were characterized as reported earlier. 13

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Section: Resultsmentioning

confidence: 99%

Luminescent Properties of Eu3+-Activated Fluorogermanate Based Red Phosphor with High Thermal Stability

Zhang

Yan

Yuan

et al. 2015

ECS Solid State Letters

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“…Our experimental results and previous investigations reveal that b-NaLuF 4 is a promising host lattice for doping optically active lanthanide ions. 40,41 Accordingly, we mainly focus on comparison of the down-conversion (DC) luminescence properties of b-NaLuF 4 MCs with different doping patterns of rare-earth ions, in an effort to show that our current solvothermal method is an efficient process for the synthesis of this kind of fluoride phosphor. All of the doping ratios of rare-earth ions are molar ratios in our experiments.…”

Section: Influential Factors and Possible Formation Mechanismmentioning

confidence: 99%

“…Particularly, b-NaLuF 4 nanoand microcrystals have been regarded as excellent host lattices for the down-conversion (DC) and up-conversion (UC) luminescence of lanthanide ions. 40,41 In comparison with Y 3+ , Lu 3+ may be more favorable for trivalent lanthanide (Ln 3+ ) dopant emission due to the intensity-borrowing mechanism mixing the 4f and 5d orbitals of the Ln 3+ ions via the lattice valence band level. 42,43 Moreover, Lu 3+ ion doping can also influence the population life time of the emitters, which may, remarkably, tune the luminescence properties (e.g.…”

Section: Introductionmentioning

confidence: 99%

Morphology-controllable synthesis and enhanced luminescence properties of β-NaLuF4:Ln (Ln = Eu, Tb and Ce/Tb) microcrystals by solvothermal process

Niu

Zhang

et al. 2012

RSC Adv.

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“…5,6 Layered perovskite structures oxide compounds have been paid more attention due to their strong direct excitation bands and higher activator critical concentration. 7 As a compound with a layered perovskite structure, complex oxides ALnTiO 4 (A includes alkaline metal, Ag and other monovalent ions, Ln ¼ rare earth) contain ordered A-site cations, therefore these compounds are typical ionic conductors. Moreover, these compounds are suitable systems to investigate the luminescent properties of two-dimensional compounds, in which the concentration of dopant is higher than others because each Ln ion has four Ln neighbors via 180 interactions and eight Ln neighbors via double 90 interactions.…”

Section: Introductionmentioning

confidence: 99%

Synthesis, electronic structures and luminescent properties of Eu³⁺ doped KGdTiO₄

et al. 2014

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Mechanism of light emission and electronic properties of a Eu3+-doped Bi2SrTa2O9 system determined by coupled X-ray absorption and emission spectroscopy

Cited by 17 publications

References 41 publications

Luminescent Properties of Eu3+-Activated Fluorogermanate Based Red Phosphor with High Thermal Stability

Luminescent Properties of Eu3+-Activated Fluorogermanate Based Red Phosphor with High Thermal Stability

Morphology-controllable synthesis and enhanced luminescence properties of β-NaLuF4:Ln (Ln = Eu, Tb and Ce/Tb) microcrystals by solvothermal process

Synthesis, electronic structures and luminescent properties of Eu³⁺ doped KGdTiO₄

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Mechanism of light emission and electronic properties of a Eu3+-doped Bi2SrTa2O9 system determined by coupled X-ray absorption and emission spectroscopy

Cited by 17 publications

References 41 publications

Luminescent Properties of Eu3+-Activated Fluorogermanate Based Red Phosphor with High Thermal Stability

Luminescent Properties of Eu3+-Activated Fluorogermanate Based Red Phosphor with High Thermal Stability

Morphology-controllable synthesis and enhanced luminescence properties of β-NaLuF4:Ln (Ln = Eu, Tb and Ce/Tb) microcrystals by solvothermal process

Synthesis, electronic structures and luminescent properties of Eu3+ doped KGdTiO4

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Synthesis, electronic structures and luminescent properties of Eu³⁺ doped KGdTiO₄