Luminescence properties of the monoclinic phase of ferromagnetic Eu2(II)SiO4

Kaldis, E.; Streit, P.; Wächter, P.

doi:10.1016/s0022-3697(71)80018-5

Cited by 28 publications

(13 citation statements)

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“…The high temperature susceptibilities follow a Curie-Weiss behaviour, and the fit to 100-300 K gives an effective moment of 7.69 m B , which is close to the ideal value of 7.94 m B of Eu 2+ , and a Weiss temperature of 4.8 K. Magnetization field loops show a typical behaviour for soft ferromagnets at low temperatures, and the saturated magnetization at 2 K is 6.1 m B . A similar compound Eu 2 SiO 4 with monoclinic structure (b phase) is also ferromagnetic and shows a higher T c of 7 K. 23 The Curie temperature of LaEuSiO 3 N is similar to that shown by the layered oxynitridosilicate EuSi 2 O 2 N 2 , which is ferromagnetic below 4.5 K. 24 In summary, these results demonstrate the potential of the new family of lanthanum alkaline earth oxynitridosilicates LaMSiO 3 N (M = Sr, Ba) as hosts for luminescent materials analogous to the efficient phosphors M 2 SiO 4 :Eu 2+ but with longer emission wavelengths caused by the introduction of one nitride and one trivalent cation. The possible substitution of La 3+ by Y 3+ or by other trivalent rare earths and of Sr 2+ or Ba 2+ for Ca 2+ would expand the possibilities to tune the optical properties and finding new luminescent materials.…”

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Red luminescence and ferromagnetism in europium oxynitridosilicates with a β-K₂SO₄ structure

et al. 2015

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The new compounds LaSrSiO3N and LaBaSiO3N activated with Eu(2+) are orange-red light-emitting luminescent materials under excitation in the UV-blue range. They represent the first examples of stoichiometric alkaline earth oxynitridosilicates with a β-K2SO4 structure. The isostructural compound LaEuSiO3N is ferromagnetic with a Curie temperature of 3 K and also shows red luminescence (λmax = 705 nm) under excitation at 405 nm.

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Red luminescence and ferromagnetism in europium oxynitridosilicates with a β-K₂SO₄ structure

et al. 2015

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“…Poort et al report that at 300 K the emission intensity is reduced by a factor of 2 14. Usually such quenching behavior corresponds with an about 0.5 eV high energy barrier 17. The similarity between the energy barrier for thermal quenching and the 0.3–0.8 eV energy difference between the first 5d state and the bottom of the conduction band strongly suggests that ionization of the 5d electron to the conduction band is the cause for luminescence quenching.…”

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Mechanism of persistent luminescence in Sr₂MgSi₂O₇:Eu²⁺; Dy³⁺

Dorenbos

2004

Physica Status Solidi (b)

127

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Persistent luminescence is the phenomenon that a phosphor after exposure to UV-light (day light) shows visible luminescence in the dark that persists during the whole night (≈ 10 hours). In 1996 a mechanism was proposed by Matsuzawa et al. [1] In order to develop a better mechanism it is necessary to know the location of the levels of Eu and Dy relative to the top of the valence band and the bottom of the conduction band. Recently a new method has become available to construct a scheme with the level locations for each divalent lanthanide ion in a compound with the use of few experimental parameters [4][5][6]. In this work that method is applied to Sr 2 MgSi 2 O 7 with the aim to understand the mechanism for the persistent luminescence. In a related paper the method is applied to the persistent luminescence [10] is interpreted as the threshold energy E fa = 7.15 eV for fundamental absorption. The following maximum at E ex = 7.4 eV can be interpreted as the exciton creation energy. Adding the exciton electron-hole binding energy, we estimate the bottom of the conduction band at E VC = 7.9 eV. These values are typical for silicate compounds and similar to those for Li 2 CaSiO 4 and Lu 2 Si 2 O 7 [11,12]. The value for E VC is used in Fig. 1 to draw the bottom of the conduction band relative to the top of the valence band which we define as the zero of energy.Next, information is required on the energy of charge transfer from the valence band to one of the trivalent lanthanide ions. For Eu 3+ in oxide compounds this energy is usually between 4 and 6 eV [8]. Qi et al. [3] report that ≈ 250 nm (5.0 eV) is an efficient wavelength to excite Eu 3+ emission in Sr 2 MgSi 2 O 7 . We interpret this as the energy of charge transfer (CT) to Eu 3+ . The transition as indicated by arrow 1 in Fig. 1 starts at

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“…However, the fabrication methods in these works require costly epitaxial and doping techniques. On the other hand, though the photoluminescence from europium silicates has been studied for decades, 3,4 until now, no EL investigation of europium silicates to the Si substrate has been reported to our knowledge.…”

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Electroluminescence of europium silicate thin film on silicon

Matsumoto

Tanaka

et al. 1999

Applied Physics Letters

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Luminescence properties of the monoclinic phase of ferromagnetic Eu2(II)SiO4

Cited by 28 publications

References 5 publications

Red luminescence and ferromagnetism in europium oxynitridosilicates with a β-K₂SO₄ structure

Red luminescence and ferromagnetism in europium oxynitridosilicates with a β-K₂SO₄ structure

Mechanism of persistent luminescence in Sr₂MgSi₂O₇:Eu²⁺; Dy³⁺

Electroluminescence of europium silicate thin film on silicon

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Luminescence properties of the monoclinic phase of ferromagnetic Eu2(II)SiO4

Cited by 28 publications

References 5 publications

Red luminescence and ferromagnetism in europium oxynitridosilicates with a β-K2SO4 structure

Red luminescence and ferromagnetism in europium oxynitridosilicates with a β-K2SO4 structure

Mechanism of persistent luminescence in Sr2MgSi2O7:Eu2+; Dy3+

Electroluminescence of europium silicate thin film on silicon

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Red luminescence and ferromagnetism in europium oxynitridosilicates with a β-K₂SO₄ structure

Red luminescence and ferromagnetism in europium oxynitridosilicates with a β-K₂SO₄ structure

Mechanism of persistent luminescence in Sr₂MgSi₂O₇:Eu²⁺; Dy³⁺