Stability of divalent/trivalent oxidation state of europium in some Sr-based inorganic compounds

Song, Zhitang; Liao, Jing; Ding, Xianlin; Zhou, Tianliang; Liu, Quanlin

doi:10.1016/j.jlumin.2012.02.013

Cited by 26 publications

(11 citation statements)

References 39 publications

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“…Table 2. The data are covert to the relation, which is used to calculate the active bond valence of each Al 3+ site based on bond valence theory and can be described as follows: 43,44 0 exp( )…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…For Al-O bond, d 0 = 1.651, C = 0.37 Å. 43,44 Thus, according to Eqs. (2) and 3, the values of bond valence are shown in Table 2.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…Before the discussion of the relationship between the solid-state NMR chemical shift ( 27 Al) and local chemical environments in AlO 4 and AlO 6 as well as the distribution of the resonance peaks in different Al 3+ sites, the coordination of Al 3+ and the bond length of Al–O data are listed in Table . The data are converted to the relation, which is used to calculate the active bond valence of each Al 3+ site based on bond valence theory and can be described as follows: , …”

Section: Resultsmentioning

confidence: 99%

“…The effective valence can be evaluated obeying the following formula: where d ij is the length of the bond between atoms of i and j , C is a universal constant, d 0 is the parameter of Al–O bonds, and j is the coordination number (or bond number). For the Al–O bond, d 0 = 1.651, C = 0.37 Å. , Thus, according to eqs and , the values of bond valence are shown in Table . The active valences of Al 3+ ions (Al1, Al2, and Al3) are close to +3, indicating that the AlO 4 tetrahedron possess strong covalence.…”

Section: Resultsmentioning

confidence: 99%

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Aluminate Red Phosphor in Light-Emitting Diodes: Theoretical Calculations, Charge Varieties, and High-Pressure Luminescence Analysis

Zhang

Tsai

Fang

et al. 2017

ACS Appl. Mater. Interfaces

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Searching for a non-rare-earth-based oxide red-emitting phosphor is crucial for phosphor-converted light-emitting diodes (LEDs). In this study, we optimized a blue and UV-light excited SrAlO:Mn phosphor exhibiting red emission peaked at ∼653 nm, which was successfully synthesized by solid-state reaction. The crystal structure, micromorphology, and luminescent properties of SrAlO:Mn phosphors were characterized by X-ray Rietveld refinement, high-resolution transmission electron microscopy, and photoluminescence spectra. The band gap and electronic structure of SrAlO were analyzed by density functional theory calculations using the hybrid exchange-correlation functional. The crystal field environment effect of Al sites from introducing activator Mn ions was investigated with the aid of Raman Al nuclear magnetic resonance spectra and electron spin resonance. The pressure dependent luminescent properties and decay time of this compound were presented. The tricolor display spectrum by combining blue InGaN chips, commercial β-SiAlON:Eu green phosphor, and SrAlO:Mn red phosphor were evaluated for commercial applications: using the present SrAlO:Mn red phosphor converted LED as a backlighting source.

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Section: ■ Results and Discussionmentioning

confidence: 99%

“…For Al-O bond, d 0 = 1.651, C = 0.37 Å. 43,44 Thus, according to Eqs. (2) and 3, the values of bond valence are shown in Table 2.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

See 2 more Smart Citations

Aluminate Red Phosphor in Light-Emitting Diodes: Theoretical Calculations, Charge Varieties, and High-Pressure Luminescence Analysis

Zhang

Tsai

Fang

et al. 2017

ACS Appl. Mater. Interfaces

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“…with no radioactive radiation and therefore it is an important materials for various ceramics industries. Rare earth‐doped silicate phosphors have been widely studied recently due to their potential application as white light emitting diodes (white LEDs) and fluorescence lamps, which are the promising candidates for next generation solid state lighting materials. The sharp spectral width, high chemical and thermal stability, diversity of crystal structure and low cost of synthesis are the outstanding merits of silicate phosphors for these applications .…”

Section: Introductionmentioning

confidence: 99%

Orange‐red emitting europium doped strontium ortho‐silicate phosphor prepared by a solid state reaction method

Sahu

2016

Luminescence

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In the present article we report europium-doped strontium ortho-silicates, namely Sr SiO :xEu (x = 1.0, 1.5, 2.0, 2.5 or 3.0 mol%) phosphors, prepared by solid state reaction method. The crystal structures of the sintered phosphors were consistent with orthorhombic crystallography with a Pmna space group. The chemical compositions of the sintered phosphors were confirmed by energy dispersive X-ray spectroscopy (EDS). Thermoluminescence (TL) kinetic parameters such as activation energy, order of kinetics and frequency factors were calculated by the peak shape method. Orange-red emission originating from the D - F (J = 0, 1, 2, 3) transitions of Eu ions could clearly be observed after samples were excited at 395 nm. The combination of these emissions constituted orange-red light as indicated on the Commission Internationale de l'Eclairage (CIE) chromaticity diagram. Mechanoluminescence (ML) intensity of the prepared phosphor increased linearly with increasing impact velocity of the moving piston that suggests that these phosphors can also be used as sensors to detect the stress of an object. Thus, the present investigation indicates that the piezo-electricity was responsible for producing ML in the prepared phosphor.

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Studies on the luminescence behavior of SrCaMgSi2O7:Eu3+ phosphor by solid state reaction method

Sahu

Bisen

Brahme

et al. 2015

J Mater Sci: Mater Electron

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Stability of divalent/trivalent oxidation state of europium in some Sr-based inorganic compounds

Cited by 26 publications

References 39 publications

Aluminate Red Phosphor in Light-Emitting Diodes: Theoretical Calculations, Charge Varieties, and High-Pressure Luminescence Analysis

Aluminate Red Phosphor in Light-Emitting Diodes: Theoretical Calculations, Charge Varieties, and High-Pressure Luminescence Analysis

Orange‐red emitting europium doped strontium ortho‐silicate phosphor prepared by a solid state reaction method

Studies on the luminescence behavior of SrCaMgSi2O7:Eu3+ phosphor by solid state reaction method

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