Photoluminescence properties of Eu2+-activated Ca2Y2Si2O9 phosphor

Abnormal blue-shift of Eu2+-activated calcium zirconium phosphates CaZr4(PO4)6

“…2(a)). The values of the band gap between EuZr 4 (PO 4 ) 6 and CaZr 4 (PO 4 ) 6 are quite similar, indicating that the substitution of Ca 2+ by Eu 2+ exhibits little influence of the band gap, as can be demonstrated by the DOS. Angular momentum projected DOS for atoms in EuZr 4 (PO 4 ) 6 concerned were plotted in Fig.…”

“…Furthermore, the 5d-4f transition of Eu 2+ decays relatively fast, making the Eu 2+ -activated materials to be used as potential scintillator [2,3]. Therefore, in the last decade, designing and developing new Eu 2+ activated phosphors for X-ray or light emitting diode (LED) have been boosted by the rapid development of the related industries around the world [4][5][6].…”

“…Recently, calcium zirconium phosphate, CaZr 4 (PO 4 ) 6 has been investigated for its potential applications as ion exchangers and host material for radioactive waste immobilization, CaZr 4 (PO 4 ) 6 has the structural flexibility with respect to isomorphic ionic replacement and high stability against leaching reactions [9]. In addition, because of their very low coefficient and anisotropy of thermal expansion, low thermal conductivity, as well as high temperature stability, making them as attractive materials for oxidation resistant coating applications on carbon-carbon composites [10,11].…”

“…In addition, because of their very low coefficient and anisotropy of thermal expansion, low thermal conductivity, as well as high temperature stability, making them as attractive materials for oxidation resistant coating applications on carbon-carbon composites [10,11]. The crystal structure of CaZr 4 (PO 4 ) 6 is understood in terms of PO 4 tetrahedra and ZrO 6 octahedra which are linked at the corners around c axis forming a three-dimensional network, and a three-dimensionally linked interstitial space is occupied partially by Ca 2+ ions [9]. More importantly, the existence of octahedral Zr(PO 4 ) 6 moietie as an efficient luminescence center in the crystal structures of CaZr 4 (PO 4 ) 6 , makes them as good host lattices for potential applications for X-ray or LED phosphor.…”

The red-emitting phosphors of Eu3+-activated MR2(MoO4)4 (M = Ba, Sr, Ca; R = La3+, Gd3+, Y3+) for light emitting diodes

“…Rare earth ions (RE) activated inorganic materials have been widely investigated because of their suitable spectroscopic characteristics to design luminescent or display materials [1][2][3][4][5][6][7]. Eu 3+ ions doped tungsten or molybdate oxides are representative red-emitting phosphors for basic luminescent materials in LED because of its high brightness and high efficiency [8][9][10][11].…”