The new phosphates Ca9(PO4)7 (M = Li, Na; Ln = rare earth, Y, Bi)

Lazoryak, B. I.; Strunenkova, T.V.; Вовк, Е. А.; Mikhailin, V. V.; Shpinkov, I.N.; Romanenko, A. Yu.; Schekoldin, V.N.

doi:10.1016/0025-5408(96)00058-x

Cited by 32 publications

(16 citation statements)

References 8 publications

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“…For instance, europium-doped silicated oxyapatites (britholites) of general formula Eu: Ca 10Àx La x (SiO 4 ) y (PO 4 ) 6Ày O z & 2Àz fluoridated [1] or unfluoridated [2,3], were synthesized by heating a mixture of powders at 1400 C. In the same way, europium-doped strontium hydroxylapatite, Sr 10Àx Eu x (PO 4 ) 6 O x (OH) 2Àx [4,5], and europium-doped oxyhydroxylapatite Ca 10Àx Eu x (PO 4 ) 6 O x (OH) 2Àx [6] have been prepared by heating around 1300 C. Europium-doped borohydroxylapatites have also been synthesized at 1000 C [7], and europium-doped b tricalcium phosphates have been obtained in a solidstate reaction at 1300 C [10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Synthesis of luminescent bioapatite nanoparticles for utilization as a biological probe

Doat

Pellé²,

Gardant³

et al. 2004

Journal of Solid State Chemistry

113

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Section: Introductionmentioning

confidence: 99%

Synthesis of luminescent bioapatite nanoparticles for utilization as a biological probe

Doat

Pellé²,

Gardant³

et al. 2004

Journal of Solid State Chemistry

113

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“…Compounds with whitlockite-like structure exhibit interesting properties with potential applications, especially in heterogeneous catalysis (1}3), as luminescent (4,5) or sensor materials (6), and as intermediators for two-stage oxidation of hydrogen (7). Analysis of the number and dimensions of the polyhedra in the -Ca (PO ) structure (8), which belongs to the whitlockite Ca Mg Fe H (PO ) (9), allowed simulation of new compounds Ca R(PO ) (R"rare earth, Y, Bi, Sc, Cr, Fe, In) (10,11), Ca M(PO ) and Ca MgM(PO ) (M"Li, Na, K, Cu) (12,13), and triple phosphates in Ca (PO ) }RPO }Na PO To whom correspondence should be addressed.…”

Section: Introductionmentioning

confidence: 99%

Preparation, Structure Determination, and Redox Characteristics of New Calcium Copper Phosphates

Lazoryak¹,

Khan²,

Морозов³

et al. 1999

Journal of Solid State Chemistry

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“…[9,25] B.I. Lazoryak [26] reported that the Ca 9 MLn 0.667 (PO 4 ) 7 compounds have been obtained as a result of 9Ca 2+ + □ = 6M + + 4Ln 3+ substitution in the β-Ca 3 (PO 4 ) 2 structure. As a member of this crystal family, the Eu 2+ -doped Ca 9 Na 1-x Li x Sc 0.667 (PO 4 ) 7 :2%Eu 2+ (0 ≤ x ≤ 1) phosphors were not previously reported.…”

Section: Introductionmentioning

confidence: 99%

Li⁺ Ion Induced Full Visible Emission in Single Eu²⁺‐Doped White Emitting Phosphor: Eu²⁺ Site Preference Analysis, Luminescence Properties, and WLED Applications

Zhang

Zheng

et al. 2021

Advanced Optical Materials

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field. Compared with the traditional light source, it has the advantages of high brightness, environmental friendliness, long duration, and energy saving. [2] Nowadays, the universal method for obtaining white light is to combine a Y 3 Al 5 O 12 :Ce 3+ (YAG:Ce 3+ ) yellow phosphor with an InGaN blue LED chip. [3] Meanwhile, this approach suffers from poor colorrendering (R a < 75) and high correlated color temperatures (CCT > 4500 K) due to the lack of a red spectral component. [4] Another effective solution to realize the high-quality white light is the convergence of the n-UV chip with RGB (red, green, and blue) phosphors. [5] However, the strong re-absorption of blue light by the red and green phosphors actually causes obvious energy loss. [6] The single-phase white emitting phosphors are accepted as an appropriate material to avert the reabsorption problem. [7] In previous reports, energy transfer was considered as an easy way to obtain single-phase white emitting phosphors. However, in many cases, due to the deficiency of some light components, the CCT and R a parameters of the WLEDs devices were not ideal, and even get cold white light. [8] The cold white light is bad for the human eye, impeding the widespread application of WLEDs in some areas, such as offices, hospitals, and the home. [9] Generally, in addition to energy transfer, promising approaches for the optimization of luminescence properties mainly include doping level control, [10] cationic-anionic substitution, [3a,11] crystal-site engineering approach, [12] and mixing of the nanophase. [13] Effective structure regulation can improve the luminescent properties of phosphors, such as enhancing quantum efficiency (QE), [14] improving thermal stability, [3a] and color tuning. [15] Therefore, to optimize and design novel single-composition white-emitting phosphors materials, structural engineering is a feasible method.Due to the sensitivity of 5d orbitals to a crystal field environment, Eu 2+ -doped phosphors possess broad absorption and emission spectra, which is more suitable for application in WLEDs. [16] Among various rare-earth-activated luminescent materials, phosphates are extensively explored as hosts because of its low synthesis temperature and exceptional optical properties. [17] Up to now, all sorts of whitlockite-type β-Ca 3 (PO 4 ) 2 -based A series of Eu 2+ single doped Ca 9 Na 1-x Li x Sc 0.667 (PO 4 ) 7 phosphors with fullspectrum emission have been synthesized. Under the 385 nm excitation, the Eu 2+ single doped Ca 9 NaSc 0.667 (PO 4 ) 7 without Li + doping displays a broad cold white light emission with the peaks at about 480 and 610 nm. With the introduction of Li + ions, the Eu 2+ ions selectively occupy the Ca1, Ca2/Ca3, and Na sites. The variation of local environment of Eu 2+ ions caused by Li + ions enhances the luminous intensity, solves the problem of the lack of a red light component, and realizes the emission color tuning from cold white via warm white to orange. A special charge compensation method caused by Li + ...

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The new phosphates Ca9(PO4)7 (M = Li, Na; Ln = rare earth, Y, Bi)

Cited by 32 publications

References 8 publications

Synthesis of luminescent bioapatite nanoparticles for utilization as a biological probe

Synthesis of luminescent bioapatite nanoparticles for utilization as a biological probe

Preparation, Structure Determination, and Redox Characteristics of New Calcium Copper Phosphates

Li⁺ Ion Induced Full Visible Emission in Single Eu²⁺‐Doped White Emitting Phosphor: Eu²⁺ Site Preference Analysis, Luminescence Properties, and WLED Applications

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The new phosphates Ca9(PO4)7 (M = Li, Na; Ln = rare earth, Y, Bi)

Cited by 32 publications

References 8 publications

Synthesis of luminescent bioapatite nanoparticles for utilization as a biological probe

Synthesis of luminescent bioapatite nanoparticles for utilization as a biological probe

Preparation, Structure Determination, and Redox Characteristics of New Calcium Copper Phosphates

Li+ Ion Induced Full Visible Emission in Single Eu2+‐Doped White Emitting Phosphor: Eu2+ Site Preference Analysis, Luminescence Properties, and WLED Applications

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Li⁺ Ion Induced Full Visible Emission in Single Eu²⁺‐Doped White Emitting Phosphor: Eu²⁺ Site Preference Analysis, Luminescence Properties, and WLED Applications