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New Insight into Phase Formation of MxMg2Al(4+x)Si(5-x)O18:Eu2+ Solid Solution Phosphors and Its Luminescence Properties.

Zhou J, Xia Z, Chen M, Molokeev MS, Liu Q - Sci Rep (2015)

Bottom Line: XRD results revealed that the as-prepared phosphors with different M(+) contents were iso-structural with Mg2Al4Si5O18 phase.The emission peaks of MxMg2Al(4+x)Si(5-x)O18:Eu(2+) (M = K, Rb) phosphors with various x values performed a systematic red-shift tendency, which was ascribed to the elongation of [MgO6] octahedra.The temperature stable photoluminescence and internal quantum efficiency (QE) of MxMg2Al(4+x)Si(5-x)O18:Eu(2+) (M = K, Rb) phosphors were enhanced owing to the filling of M(+) in the void channels suggesting a new insight to design the solid solution phosphors with improved photoluminescence properties.

View Article: PubMed Central - PubMed

Affiliation: School of Materials Sciences and Technology, China University of Geosciences, Beijing 100083, China.

ABSTRACT
Here we reported the phase formation of MxMg2Al(4+x)Si(5-x)O18:Eu(2+) (M = K, Rb) solid solution phosphors, where M(+) ions were introduced into the void channels of Mg2Al4Si5O18 via Al(3+)/Si(4+) substitution to keep the charge balance. XRD results revealed that the as-prepared phosphors with different M(+) contents were iso-structural with Mg2Al4Si5O18 phase. The combined analysis of the Rietveld refinement and high resolution transmission electron microscopy (HRTEM) results proved that M(+) ions were surely introduced into the intrinsic channels in Mg2Al4Si5O18. The emission peaks of MxMg2Al(4+x)Si(5-x)O18:Eu(2+) (M = K, Rb) phosphors with various x values performed a systematic red-shift tendency, which was ascribed to the elongation of [MgO6] octahedra. The temperature stable photoluminescence and internal quantum efficiency (QE) of MxMg2Al(4+x)Si(5-x)O18:Eu(2+) (M = K, Rb) phosphors were enhanced owing to the filling of M(+) in the void channels suggesting a new insight to design the solid solution phosphors with improved photoluminescence properties.

No MeSH data available.


Schematic crystal structure diagrams of Mg2Al4Si5O18 with channel void along c-axis (a) and MxMg2Al4+xSi5−xO18 compounds showing the existence of K+/Rb+ doping into the void (b).
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f1: Schematic crystal structure diagrams of Mg2Al4Si5O18 with channel void along c-axis (a) and MxMg2Al4+xSi5−xO18 compounds showing the existence of K+/Rb+ doping into the void (b).

Mentions: Figure 1 presents the structural diagram of Mg2Al4Si5O18 and typical compound of MxMg2Al4+xSi5−xO18, respectively. As can be seen from Fig. 1a, Mg2Al4Si5O18 belongs to hexagonal structure and has void channels along c-axis. In the structure, the [MgO6] octahedral was surrounded by the Si6O18-type 6-membered rings, which consists of corner-shared tetrahedra of [AlO4] and [(Si/Al)O4]. There is no direct bonding between rings, but they are linked by [MgO6] and by [AlO4] above and below. The Si atoms in the rings are bonded to two oxygen atoms in layers above and below and to two oxygen atoms in the ring. To the best of our knowledge, there are no further reports on this void channels and their potential optical application. Based on this, we tried to synthesize MxMg2Al4+xSi5−xO18:Eu2+ (M = K, Rb) with different contents by introducing M+ into the void channels and using Al3+ and Si4+ to balance the charge.


New Insight into Phase Formation of MxMg2Al(4+x)Si(5-x)O18:Eu2+ Solid Solution Phosphors and Its Luminescence Properties.

Zhou J, Xia Z, Chen M, Molokeev MS, Liu Q - Sci Rep (2015)

Schematic crystal structure diagrams of Mg2Al4Si5O18 with channel void along c-axis (a) and MxMg2Al4+xSi5−xO18 compounds showing the existence of K+/Rb+ doping into the void (b).
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4507260&req=5

f1: Schematic crystal structure diagrams of Mg2Al4Si5O18 with channel void along c-axis (a) and MxMg2Al4+xSi5−xO18 compounds showing the existence of K+/Rb+ doping into the void (b).
Mentions: Figure 1 presents the structural diagram of Mg2Al4Si5O18 and typical compound of MxMg2Al4+xSi5−xO18, respectively. As can be seen from Fig. 1a, Mg2Al4Si5O18 belongs to hexagonal structure and has void channels along c-axis. In the structure, the [MgO6] octahedral was surrounded by the Si6O18-type 6-membered rings, which consists of corner-shared tetrahedra of [AlO4] and [(Si/Al)O4]. There is no direct bonding between rings, but they are linked by [MgO6] and by [AlO4] above and below. The Si atoms in the rings are bonded to two oxygen atoms in layers above and below and to two oxygen atoms in the ring. To the best of our knowledge, there are no further reports on this void channels and their potential optical application. Based on this, we tried to synthesize MxMg2Al4+xSi5−xO18:Eu2+ (M = K, Rb) with different contents by introducing M+ into the void channels and using Al3+ and Si4+ to balance the charge.

Bottom Line: XRD results revealed that the as-prepared phosphors with different M(+) contents were iso-structural with Mg2Al4Si5O18 phase.The emission peaks of MxMg2Al(4+x)Si(5-x)O18:Eu(2+) (M = K, Rb) phosphors with various x values performed a systematic red-shift tendency, which was ascribed to the elongation of [MgO6] octahedra.The temperature stable photoluminescence and internal quantum efficiency (QE) of MxMg2Al(4+x)Si(5-x)O18:Eu(2+) (M = K, Rb) phosphors were enhanced owing to the filling of M(+) in the void channels suggesting a new insight to design the solid solution phosphors with improved photoluminescence properties.

View Article: PubMed Central - PubMed

Affiliation: School of Materials Sciences and Technology, China University of Geosciences, Beijing 100083, China.

ABSTRACT
Here we reported the phase formation of MxMg2Al(4+x)Si(5-x)O18:Eu(2+) (M = K, Rb) solid solution phosphors, where M(+) ions were introduced into the void channels of Mg2Al4Si5O18 via Al(3+)/Si(4+) substitution to keep the charge balance. XRD results revealed that the as-prepared phosphors with different M(+) contents were iso-structural with Mg2Al4Si5O18 phase. The combined analysis of the Rietveld refinement and high resolution transmission electron microscopy (HRTEM) results proved that M(+) ions were surely introduced into the intrinsic channels in Mg2Al4Si5O18. The emission peaks of MxMg2Al(4+x)Si(5-x)O18:Eu(2+) (M = K, Rb) phosphors with various x values performed a systematic red-shift tendency, which was ascribed to the elongation of [MgO6] octahedra. The temperature stable photoluminescence and internal quantum efficiency (QE) of MxMg2Al(4+x)Si(5-x)O18:Eu(2+) (M = K, Rb) phosphors were enhanced owing to the filling of M(+) in the void channels suggesting a new insight to design the solid solution phosphors with improved photoluminescence properties.

No MeSH data available.