Luminescence, structure and antiferroelectric-type phase transition in Ca8ZnEu(PO4)7
Source abstract
Abstract
Abstract Photoluminescence excitation and emission spectra of new phosphate Ca8ZnEu(PO4)7 have been investigated. The influence of the composition on the luminescence intensity has been shown. The substitution of Zn2+ for Ca2+ in Ca9Eu(PO4)7 with the formation of Ca8ZnEu(PO4)7 leads to the increased emission intensity 5D0 → 7F2 by about 1.5 times and to decreased number of bands from three to one in the range of 5D0 → 7F0 transition. Conditions of preparation do not influence the luminescent properties and distribution of Eu3+ cations in the structure. DSC, SHG data and dielectric spectroscopy reveal that Ca8ZnEu(PO4)7 belongs to antiferroelectrics (Tc = 836 K). The first-order antiferroelectric/paraelectric transformations are accompanied by a changing symmetry (R 3 ¯ с to R 3 ¯ m). The structure of Ca8ZnEu(PO4)7 (sp. gr. R 3 ¯ с) was refined by the Rietveld method. The Zn2+ cations occupy the M5 site. The Eu3+ and Ca2+ ions are located in the M1 and M3 sites of β-Ca3(PO4)2-type structure.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Luminescence Properties of Advanced Materials · Crystal Structures and Properties · Solid-state spectroscopy and crystallography
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References (47)
Show source-provided references
1. Nakamura · 1997
2. Solid-State lighting: toward superior illumination10.1109/JPROC.2005.853537 ↗
3. A novel pure red phosphor Ca8MgLu(PO4)7:Eu3+ for near ultraviolet white light-emitting diodes10.1016/j.ceramint.2015.04.023 ↗
4. Crystallographic studies of the role of Mg as a stabilizing impurity in β-Ca3(PO4)2. The crystal structure of pure β-Ca3(PO4)210.1016/0022-4596(74)90030-9 ↗
5. Structural study of Yb3+, Eu3+ and Pr3+ doped Ca9Lu(PO4)710.1016/S1002-0721(14)60515-9 ↗
6. New insight in the structure–luminescence relationships of Ca9Eu(PO4)710.1016/j.jssc.2009.06.018 ↗
7. Luminescence properties and site occupations of Eu3+ ions doped in double phosphates Ca9R(PO4)7 (R = Al, Lu)10.1039/c0jm03324c ↗
8. The luminescence spectroscopy and thermal stability of red-emitting phosphor Ca9Eu(VO4)710.1016/j.ceramint.2011.03.031 ↗
9. Thermal quenching mechanisms of the Eu3+ luminescence in Ca9Al(PO4)7 obtained by citric route10.1016/j.materresbull.2012.10.034 ↗
10. On the interconfigurational 4fn↔fn-15d optical transitions of Ce3+ and Pr3+ in Ca9R(PO4)7 [R = Al, Ga, Sc, Lu, Y, Gd, La]10.1016/j.jlumin.2016.04.004 ↗
11. Crystal structure and luminescence properties of a single-component white-light-emitting phosphor Ca8ZnLa(PO4)7:Eu2+, Mn2+10.1111/jace.14868 ↗
12. Synthesis and luminescence of Eu3+-doped in triple phosphate Ca8MgBi(PO4)7 with whitlockite structure10.1002/bio.2878 ↗
13. Antiferroelectric properties and site occupations of R3+ cations in Ca8MgR(PO4)7 luminescent host materials10.1016/j.jallcom.2016.12.288 ↗
14. Energy transfer and luminescent properties of Ca8MgLu(PO4)7:Tb3+/Eu3+ as a green-to-red color tunable phosphor under NUV excitation10.1039/C5RA08680A ↗
15. Tunable luminescence and energy transfer properties in Ca8MgLu(PO4)7:Ce3+, Tb3+, Mn2+ phosphors10.1039/C4TC02433H ↗
16. Luminescence and microstructures of Eu3+-doped in triple phosphate Ca8MgR(PO4)7 (R = La, Gd, Y) with whitlockite structure10.1016/j.materresbull.2008.09.025 ↗
17. Standard white-emitting Ca8MgY(PO4)7:Eu2+, Mn2+ phosphor for white-light-emitting LEDs10.1149/2.019309jss ↗
18. Synthesis and investigation of photo/cathodoluminescence properties of a novel green emission phosphor Sr8ZnLu(PO4)7:Eu2+10.1016/j.jallcom.2016.01.249 ↗
19. A single-composition trichromatic white-light-emitting phosphor based on Sr8ZnY(PO4)7 coactivated with Ce3+, Tb3+, and Mn2+10.1007/s11664-016-5175-0 ↗
20. Sr8ZnSc(PO4)7:Eu3+, Li+ novel red-emitting phosphors: synthesis and photoluminescence properties10.1016/j.materresbull.2016.10.021 ↗
21. Novel yellow-emitting Sr8MgLn(PO4)7:Eu2+ (Ln = Y, La) phosphors for applications in white LEDs with excellent color rendering index10.1021/ic200515w ↗
22. Whitlockite solid solutions Ca9−xMxR(PO4)7 (x = 1, 1.5; M = Mg, Zn, Cd; R = Ln, Y) with antiferroelectric properties10.1134/S0036023607030023 ↗
23. Dielectric and nonlinear optical properties of the Ca9R(PO4)7 (R = Ln) phosphates
24. Structural aspects of calcium ion transport in Ca3(VO4)2 and Ca3–xNd2x/3(VO4)2 solid solutions
25. Effect of vacancies on Ca45 diffusion in the solid solutions Ca3(1-x)Eu2x(VO4)2
26. Ca3(VO4)2-LaVO4 cation conductors10.1023/A:1024057405145 ↗
27. The new phosphates Ca9MLn2/3(PO4)7 (M = Li, Na; Ln = rare earth, Y, Bi)10.1016/0025-5408(96)00058-X ↗
28. Luminescence and microstructures of Eu3+-doped Ca9LiGd2(PO4)710.1039/c1dt11075f ↗
29. Double phosphates Ca9R(PO4)7 (R = Rare-Earth Element, Y, Bi) with the whitlockite structure
30. Site occupancy and mechanisms of thermally stimulated luminescence in Ca9Ln(PO4)7 (Ln = lanthanide)10.1016/j.actamat.2012.08.034 ↗
31. Distribution of Eu ions in whitlockite-type orthophosphates Ca3-xEu2x/3(PO4)2
32. A novel red Ca8.5Pb0.5Eu(PO4)7 phosphor for light emitting diodes application10.1016/j.jallcom.2015.06.123 ↗
33. Luminescence properties and site occupations of Eu3+ ions doped in double phosphates Ca9R(PO4)7 (R = Al, Lu)10.1039/c0jm03324c ↗
34. Comment on “Tuning of photoluminescence and local structures of substituted cations in xSr2Ca(PO4)2−(1−x)Ca10Li(PO4)7:Eu2+ phosphors”10.1021/acs.chemmater.7b00625 ↗
35. Color tuning in (Ca1−xSrx)8MgLu(PO4)7:Eu2+, Mn2+ phosphor via host composition design and energy transfer10.1016/j.ceramint.2017.04.059 ↗
36. Tuning of photoluminescence and local structures of substituted cations in xSr2Ca(PO4)2-(1-x)Ca10Li(PO4)7:Eu2+ phosphors10.1021/acs.chemmater.7b00006 ↗
37. A profile refinement method for nuclear and magnetic structures10.1107/S0021889869006558 ↗
38. Crystallographic computing system JANA2006: General features
39. Tuning of nonlinear optic and ferroelectric properties via the cationic composition of Ca9.5-1.5xBixCd(VO4)7 solid solutions10.1016/j.matdes.2016.11.107 ↗
40. High-temperature phase transition in the whitlockite type phosphate Ca9In(PO4)710.1006/jssc.2001.9521 ↗
41. Optical non-linearity tuning in Ca8–xPbxMBi(VO4)7 whitlockite-type systems10.1016/j.jallcom.2016.02.218 ↗
42. Antiferroelectric phase transition in Sr9In(PO4)710.1103/PhysRevB.70.172103 ↗
43. Role of the sintering temperature and doping level in the structural and spectral properties of Eu-doped nanocrystalline YVO410.1021/ic202444s ↗
44. Some misconceptions concerning the electronic spectra of tri-positive europium and cerium10.1039/c3cs60033e ↗
45. The emission spectrum and the radiative lifetime of Eu3+ in luminescent lanthanide complexes
46. Synthesis, crystal structure and luminescence characteristics of a novel red phosphor Ca19Mg2(PO4)14:Eu3+ for light emitting diodes and field emission displays10.1039/c3tc31263a ↗
47. On the Eu3+ fluorescence in mixed metal oxides10.1016/0022-3697(66)90236-8 ↗