Luminescence, energy transfer and color perception studies of Na3Gd(PO4)2:Dy3+:Tm3+ phosphors

Four-Dimensional Incommensurate Modulation and Luminescent Properties of Host Material Na3La(PO4)2

“…The output of Superflip gives most of the atoms, and the rest, several ones, can be found from the difference Fourier peak utility. To reach the best refinement of incommensurate structural model, we carefully checked the difference-Fourier maps (Figure 4), assigned the modulation waves, and realized that it was more suitable to introduce the first-order crenel (Legendre polynomials in crenel interval type) modulation wave amplitudes to Na 1 , O 6 , O 12 , and O 16 atoms to avoid a large number of harmonic position modulation functions. Although the second-order satellite reflections is very low that only 322 reflections were observed with I > 3σ (I), it would lead to a better refinement when we applied some second-order positional modulations for heavy atoms La 1 , La 2 , P 1 , P 2 , P 3 , and P 4 .…”

“…29) and unit cell of a ≈ 5.522 Å, b ≈ 14.05 Å, c ≈ 18.44 Å; they are built on isolated LnO x polyhedra, NaO x polyhedra, and PO 4 tetrahedra. Since recent years, a large amount of literature concerning the luminescent properties of compounds Na 3 Ln­(PO 4 ) 2 has been reported. − However, the structural details of Na 3 Ln­(PO 4 ) 2 family were not fully studied especially for some early rare earths despite some reports have already discussed this matter in early years. − To general surprise, the detailed crystal structure of Na 3 La­(PO 4 ) 2 is still unknown. This was the incentive for us to start a study on the crystal structure of compounds Na 3 Ln­(PO 4 ) 2 to establish the relation between their crystal structure and physical properties.…”

Phosphorescence behavior and photoluminescence mechanism of Dy 3+ sensitized β-Zn 3 (PO 4 ) 2 : Mn 2+ phosphor

“…2 [30], respectively. The main emission peak at 482 nm is corresponded to spin forbidden 4f-4f transitions of Dy 3+ ( 4 F 9/2 -6 H 15/2 , magnetic dipole) [31].…”

Luminescence and energy transfer of Tm3+ and Dy3+ co-doped Na3ScSi2O7 phosphors

“…At present, a large number of Tm and Dy co-doped single-phase white light emitting phosphors have been reported. For example, YGa 3 (BO 3 ) 4 :Tm 3+ ,Dy 3+ , 15 NaBi(WO 4 ) 2 :Tm 3+ ,Dy 3+ , 16 Ba 3 La 6 (SiO 4 ) 6 :-Tm 3+ ,Dy 3+ , 17 Sr 3 Y(PO 4 ) 3 :Tm 3+ ,Dy 3+ , 18 Na 3 Gd(PO 4 ) 2 :Dy 3+ ,Tm 3+ , 19 NaGd(WO 4 ) 2 :Tm 3+ ,Dy 3+ , 20 etc. In particular, silicates based luminous materials have been paid more attention because of their low synthesis temperature, stable chemical properties, simple preparation process and so on.…”