Structures and luminescent properties of single-phase La 5.90−x Ba 4+x (SiO 4 ) 6−x (PO 4 ) x F 2 :0.10Ce 3+ phosphors

Guo, Qingfeng; Liao, Libing; Mei, Lefu; Liu, Haikun

doi:10.1016/j.jlumin.2015.12.013

Cited by 14 publications

(1 citation statement)

References 24 publications

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“…Luminescence properties, such as the thermal stability and spectral position, can be effectively improved. Thus, anionic polyhedral substitution has become an effective way of designing a new host to modify the luminescence properties. − For example, through chemical unit cosubstitution of (Al 3+ -F – ) for (Si 4+ -O 2– ), the emission peak shifts from 520 to 490 nm with increasing (Al 3+ -F – ) content in (1 – x )Sr 3 SiO 5 - x (Sr,Ba) 3 AlO 4 F:Ce 3+ . The emission peak of Lu x Sr 1.97– x N x O 4– x :0.03Eu 2+ redshifts from 563 to 583 nm with increasing (Lu 3+ -N 3– ) content .…”

Section: Introductionmentioning

confidence: 99%

Mechanism of Crystal Structure Transformation and Abnormal Reduction in Ca_5–y(BO₃)_3–x(PO₄)_xF (CBP_xF):yBi³⁺

Wang

Liu

et al. 2018

Inorg. Chem.

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Tricoordinated planar triangle (PO 4 ) 3− may be formed due to the structural differences between planar triangular (BO 3 ) 3− and tetrahedral (PO 4 ) 3− when (BO 3 ) 3− is gradually substituted by (PO 4 ) 3− . This transformation of structure may affect the luminescence properties of phosphor. Therefore, a series of Ca 5−y (BO 3 ) 3−x (PO 4 ) x F (CBP x F):yBi 3+ (y = 0.05, 0.15; x = 0−3), Ca 5−y (PO 4 ) 3−X (BO 3 ) X F (CPB X F):yBi 3+ (y = 0.05, 0.15; X = 0−1), Ca 4.9 (PO 4 ) 3 F (CPF):0.1Eu 3+ , Ca 4.95 (PO 4 ) 3 F (CPF):0.05Bi 3+ , and nCaF 2 /CaCl 2 (n = 0−0.1) are synthesized to explore transformation of the crystal structure on luminescence properties. In CBP x F:0.15Bi 3+ (x = 0−3), (PO 4 ) 3− is doped to substitute for (BO 3 ) 3− , the position of emission spectra remains unchanged and the emission intensity decreases rapidly with increasing x. The underlying main reason for that is formation of the triangular plane (PO 4 ) 3− , which has been verified by performing a series of verification experiments of CPB X F:yBi 3+ (y = 0.5, 0.15; X = 0−1). In CPB X F:yBi 3+ (y = 0.5, 0.15; X = 0−1), (BO 3 ) 3− is doped to substitute for (PO 4 ) 3− , P− O2 bond breaks and the coordination of (PO 4 ) 3− varies from four to three when 0.5 < X < 1; meanwhile, the crystal structure transforms from Ca 5 (PO 4 ) 3 F (ICSD-9444) to Ca 5 (PO 4 ) 3 F (ISCD-30261), which impedes abnormal reduction from Bi 3+ to Bi 2+ . Furthermore, Bi 3+ should non-luminance in the plane triangular (PO 4 ) 3− , but luminescence in (BO 3 ) 3− . Therefore, the emission intensity starts to increase and the emission position suddenly changes from 553 to 474 nm in CPB X F:yBi 3+ (y = 0.05, 0.15; 0.5 < X < 1). From this, the crystal structures of CBP x F:yBi 3+ (y = 0.05, 0.15; x = 0−3) has been inferred to transform from Ca 5 (BO 3 ) 3 F (ISCD-65763) to Ca 5 (PO 4 ) 3 F (ISCD-30261), and then to Ca 5 (PO 4 ) 3 F (ISCD-9444) with x increasing. Emission position remains unchanged and the emission intensity decreases rapidly in CBP x F:yBi 3+ (y = 0.05, 0.15; x = 0−3) do to formation of the triangular plane (PO 4 ) 3− . In addition, the rate of abnormal reduction from Bi 3+ to Bi 2+ can be improved by reducing the electronegativity of the environment around the activator or increasing the ionization energy of the activator, which has been confirmed by verification experiments of CPF:0.05Bi 3+ , nCaF 2 /CaCl 2 (n = 0−0.1), and CPF:0.1Eu 3+ .

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Section: Introductionmentioning

confidence: 99%

Mechanism of Crystal Structure Transformation and Abnormal Reduction in Ca_5–y(BO₃)_3–x(PO₄)_xF (CBP_xF):yBi³⁺

Wang

Liu

et al. 2018

Inorg. Chem.

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Structural and photoluminescence behavior of a blue–green-emitting Y6Ba4(SiO4)6F2:xTb3+ fluorapatite phosphor

Sahu

Agrawal

2020

J Mater Sci: Mater Electron

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Synthesis of silicate apatite phosphors with enhanced luminescence via optimized precipitation technique through pH control

Perhaița

Mureşan

Tudoran

et al. 2020

J Sol-Gel Sci Technol

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Structures and luminescent properties of single-phase La 5.90−x Ba 4+x (SiO 4 ) 6−x (PO 4 ) x F 2 :0.10Ce 3+ phosphors

Cited by 14 publications

References 24 publications

Mechanism of Crystal Structure Transformation and Abnormal Reduction in Ca_5–y(BO₃)_3–x(PO₄)_xF (CBP_xF):yBi³⁺

Mechanism of Crystal Structure Transformation and Abnormal Reduction in Ca_5–y(BO₃)_3–x(PO₄)_xF (CBP_xF):yBi³⁺

Structural and photoluminescence behavior of a blue–green-emitting Y6Ba4(SiO4)6F2:xTb3+ fluorapatite phosphor

Synthesis of silicate apatite phosphors with enhanced luminescence via optimized precipitation technique through pH control

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Structures and luminescent properties of single-phase La 5.90−x Ba 4+x (SiO 4 ) 6−x (PO 4 ) x F 2 :0.10Ce 3+ phosphors

Cited by 14 publications

References 24 publications

Mechanism of Crystal Structure Transformation and Abnormal Reduction in Ca5–y(BO3)3–x(PO4)xF (CBPxF):yBi3+

Mechanism of Crystal Structure Transformation and Abnormal Reduction in Ca5–y(BO3)3–x(PO4)xF (CBPxF):yBi3+

Structural and photoluminescence behavior of a blue–green-emitting Y6Ba4(SiO4)6F2:xTb3+ fluorapatite phosphor

Synthesis of silicate apatite phosphors with enhanced luminescence via optimized precipitation technique through pH control

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Mechanism of Crystal Structure Transformation and Abnormal Reduction in Ca_5–y(BO₃)_3–x(PO₄)_xF (CBP_xF):yBi³⁺

Mechanism of Crystal Structure Transformation and Abnormal Reduction in Ca_5–y(BO₃)_3–x(PO₄)_xF (CBP_xF):yBi³⁺