Synthesis and photoluminescence properties of a novel Sr₂CeO₄:Dy³⁺nanophosphor with enhanced brightness by Li⁺co-doping

Abstract

A series of Dy3+ (0.005–0.09 mol%) and Li+ (0.005–0.03 mol%) co-doped strontium cerate (Sr2CeO4) nanopowders are synthesized by low temperature solution combustion synthesis.

The effect of Li+ ions on the luminescent properties of a single-phase white light-emitting phosphor α-Sr2P2O7:Dy3+

“…The host compound α-Sr 2 P 2 O 7 crystallizes in an orthorhombic structure with space group Pnma, in which although all the Sr 2+ ions can be divided into two different types with the SrO 9 polyhedron, both Sr 2+ sites have the same symmetry (C s ) with slightly different site sizes. 5 The concentration quenching phenomenon of the active ions is often due to the energy transfer (ET) from one activator to another until all of the energy is consumed. When Dy 3+ ions are located in slightly different Sr 2+ sites, there should be no evident change in the spectroscopic properties, including fluorescence intensity and the location of the excitation and emission peaks in ultraviolet (UV)-visible region.…”

“…1 Compared with other methods, singly doping a rare earth ion is still the simplest and most straightforward method to obtain white light in a single-phase host material despite the possibility of low luminous efficiency and intensity. [3][4][5][6][7][8][9][10] In addition, the hypersensitive 4 F 9/2 → 6 H 13/2 electric dipole transition of Dy 3+ ion is sensitive to the chemical environment surrounding Dy 3+ ion, so the yellow-to-blue (Y/B) emission intensity ratio ( 4 F 9/2 → 6 H 13/2 )/ ( 4 F 9/2 → 6 H 15/2 ) also reflects the coordination surroundings of the Dy 3+ ion to some extent, and thus Dy 3+ ions can be useful for probing the site symmetry of Dy 3+ 4,9 Thus, the investigation on Dy 3+ -doped phosphors is still worthwhile not only for potential industrial applications but also for basic research. Different from the white light from Eu 2+ or Eu 3+ ions, white-light generation from Dy 3+ ions is not influenced significantly by the crystal structure and phonon frequency of the host lattice.…”

Photoluminescence properties of novel white phosphor of Dy3+-doped LaBSiO5 glass

“…Fig. 4 [11,12]. Furthermore, the main excitation bands at 300-450 nm suggest that the LaBSiO 5 :Dy 3 þ phosphor is suitable to be excited by near-UV LED S .…”

Ultraviolet to near-infrared conversion in Nd3+ doped strontium cerate nanophosphors

“…Sr 2 CeO 4 :Eu 3+ (Dy 3+ , Tm 3+ ) materials show a highly efficient red (yellow, blue) emission and might be strong candidates for display applications such as ultraviolet light-emitting diodes (UV-LEDs) [5][6][7][8]. RE (Ho 3+ , Er 3+ , Tm 3+ Yb 3+ ) doped Sr 2 CeO 4 crystals have been studied as laser materials or spectral conversion materials because of their favorable thermal, physical properties and superior lasing performances [9][10][11][12][13]. However, there are no studies on the Nd-doped Sr 2 CeO 4 materials.…”

“…Since it is an active center with 100% concentration, Sr 2 CeO 4 doped with rare-earth (RE) ions, such as Eu 3+ , Ho 3+ , Er 3+ , Pr 3+ , Tb 3+ , Tm 3+ Sm 3+ , Dy 3+ and Yb 3+ attract lots of attention from researchers [5][6][7][8][9][10][11][12][13]. Effective energy transfer from Ce 4+ -O 2À metal-to-ligand charge transfer (MLCT) to these activation centers has been proposed to be responsible for their luminescence in Sr 2 CeO 4 .…”