Phase transitions in Ca3(BN2)2 and Sr3(BN2)2

Häberlen, Marco; Gläser, Jochen; Meyer, H.‐Jürgen

doi:10.1016/j.jssc.2005.02.008

Cited by 23 publications

(18 citation statements)

References 9 publications

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“…Therefore, the superstructure of β-Ca 3 B 2 N 4 is a result of the ordering of ions and vacancies on the 8c position of the cubic α- Ca 3 B 2 N 4 structure. As reported by Marco Häberlen, the phase transformation between the α-Ca 3 B 2 N 4 and β-Ca 3 B 2 N 4 would happen due to the different heating and cooling rates.…”

Section: Results and Discussionmentioning

confidence: 79%

“…The phases of α-Ca 3 B 2 N 4 and β-Ca 3 B 2 N 4 have been reported by Marco Häberlen, which illustrated that the phase transformation would happen between α-Ca 3 B 2 N 4 and β-Ca 3 B 2 N 4 with the production of defect. In the phase of α-Ca 3 B 2 N 4 , there is one type of Ca site occupying the equivalent (8c) positions with the occupancy of 0.875, and β-Ca 3 B 2 N 4 has two kinds of Ca sites occupying the equivalent (4b) and (4a) positions with the same occupancy of 0.5.…”

Section: Introductionmentioning

confidence: 72%

See 1 more Smart Citation

Self-Activated Yellow Light Emitting Phosphors of α, β-Ca₃B₂N₄ with Long Afterglow Properties

Ding

Long

et al. 2016

Inorg. Chem.

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Defect luminescence has been considered to be one of the most efficient ways to resolve the problem of the recent limited supply and increased demand for rare-earth elements. So, in this work, a novel self-activated long-persistent green-yellow and yellow emitting phosphors of α-CaBN and β-CaBN has been successfully synthesized by sample-pressuring sintering. The α-CaBN and β-CaBN all have a broad excitation band peaked at 300 and 350 nm and emit yellow-green light peaked at 550 nm and yellow light peaked at 575 nm respectively with the long afterglow properties. The crystal structures and electron structures of α-CaBN and β-CaBN have been investigated to show that orthorhombic β-CaBN corresponds to an ordered superstructure of cubic α-CaBN and the phase transformation between α-CaBN and β-CaBN would happen during the preparation process, which produces many intrinsic defects forming the luminescent center. The thermoluminescence (TL) curve shows that there are traps in the host lattice with the TL peak located at 310 K. The results indicate that α-CaBN and β-CaBN with the defect-related PL and LPL properties have potential applications in the LED and LPL used phosphors.

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Section: Results and Discussionmentioning

confidence: 79%

Section: Introductionmentioning

confidence: 72%

Self-Activated Yellow Light Emitting Phosphors of α, β-Ca₃B₂N₄ with Long Afterglow Properties

Ding

Long

et al. 2016

Inorg. Chem.

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“…[1] Such phases form with the alkali metals lithium (α-and β-Li 3 [BN 2 ]) [2][3][4][5] and sodium (Na 3 [BN 2 ] and an ordered phase Na 2 K[BN 2 ]) [6,7] and the alkaline earth metals. [8][9][10][11][12] In the latter case, polymorphism has been observed for the calcium and strontium compound and Ba 3 [BN 2 ] 2 [9] shows a distinctly different arrangement of the [BN 2 ] 3-units. Combing an alkali and an alkaline earth cation leads to ordered phases, e.g.…”

Section: Introductionmentioning

confidence: 99%

Li₄Ba[BN₂]₂ – Structure and Vibrational Spectra

Seidel

Somer

Kiraz

et al. 2017

Zeitschrift anorg allge chemie

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“…10 It is interesting to find that Eu 3+ ions can exist in the phase of α-M 3 B 2 N 4 (M = Ca, Sr). The phases of α-Sr 3 B 2 N 4 and α-Ca 3 B 2 N 4 have been reported by Haberlen,11 illustrating that α-M 3 B 2 N 4 (M = Ca, Sr) has a stable crystal structure due to the [N = BN] 3− and that there are two kinds of sites for rare earth to occupy. However, the luminescence properties of α-M 3 B 2 N 4 (M = Ca, Sr) have never been reported.…”

Section: Introductionmentioning

confidence: 71%

α-M₃B₂N₄ (M = Ca, Sr):Eu³⁺: A Nitride-based Red Phosphor with a Sharp Emission Line and Broad Excitation Band Used for WLED

Ding

et al. 2017

J. Phys. Chem. C

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For solving the problem that Eu3+-activated phosphors cannot be well excited by the near UV-LED chips, the charge transfer band (CTB) of Eu3+-N3– in α-M3B2N4 (M = Ca, Sr) has been investigated in this work. Compared with the sharp excitation peaks due to the f–f transitions of Eu3+, the charge transfer band is broad and the excitation band of α-M3B2N4 (M = Ca, Sr):Eu3+ centered at 370 or 350 nm lies in near-UV, implying a promising excitation. The electron and crystal structures of α-M3B2N4 (M = Ca, Sr) has been analyzed in detailed, indicating that they all crystallize in cubic phase with the space group (Im3̅m) and have similar band-gap structures. The double bond of [N = BN]3– combining with the face-shared (Ca, Sr)N6 octahedron forms the stable and compact crystal structure, and the band gap with the value about 4 eV is suitable for Eu3+ to form a luminescent center. Under near-UV excitation, the sharp red light that peaked at 613 and 593 nm resulting from the f–f transition of Eu3+ ions has been obtained. The optimal concentration of Eu3+ in the α-M3B2N4 (M = Ca, Sr) has been measured, and the decay curves of samples prove that the energy transfer happens between Eu3+ ions through the dipole–dipole interaction. The thermal stability of samples has been measured to access their application in the WLED.

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Phase transitions in Ca3(BN2)2 and Sr3(BN2)2

Cited by 23 publications

References 9 publications

Self-Activated Yellow Light Emitting Phosphors of α, β-Ca₃B₂N₄ with Long Afterglow Properties

Self-Activated Yellow Light Emitting Phosphors of α, β-Ca₃B₂N₄ with Long Afterglow Properties

Li₄Ba[BN₂]₂ – Structure and Vibrational Spectra

α-M₃B₂N₄ (M = Ca, Sr):Eu³⁺: A Nitride-based Red Phosphor with a Sharp Emission Line and Broad Excitation Band Used for WLED

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Phase transitions in Ca3(BN2)2 and Sr3(BN2)2

Cited by 23 publications

References 9 publications

Self-Activated Yellow Light Emitting Phosphors of α, β-Ca3B2N4 with Long Afterglow Properties

Self-Activated Yellow Light Emitting Phosphors of α, β-Ca3B2N4 with Long Afterglow Properties

Li4Ba[BN2]2 – Structure and Vibrational Spectra

α-M3B2N4 (M = Ca, Sr):Eu3+: A Nitride-based Red Phosphor with a Sharp Emission Line and Broad Excitation Band Used for WLED

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Self-Activated Yellow Light Emitting Phosphors of α, β-Ca₃B₂N₄ with Long Afterglow Properties

Self-Activated Yellow Light Emitting Phosphors of α, β-Ca₃B₂N₄ with Long Afterglow Properties

Li₄Ba[BN₂]₂ – Structure and Vibrational Spectra

α-M₃B₂N₄ (M = Ca, Sr):Eu³⁺: A Nitride-based Red Phosphor with a Sharp Emission Line and Broad Excitation Band Used for WLED