K₈Nb₇P₇O₃₉: a new type of complicated incommensurately modulated structure and photoluminescence properties of Eu³⁺-doped solid solutions

Abstract

A new type of potassium niobium phosphate, K8Nb7P7O39, has been prepared and its (3 + 1)-dimensional incommensurately modulated structure has been modeled.

Ca5Ga6O14:Eu3+: A novel phosphor with outstanding heat resistance for white light‐emitting diodes

“…Therefore, Eu 3+ ions are good activators for making red phosphors. At present, a crowd of Eu 3+ activated phosphors were developed, such as Y 2 O 3 :Eu 3+ , KLa 5 O 5 (VO 4 ) 2 :Eu 3+ , and K 8 Nb 7 P 7 O 39 :Eu 3+ , Ca 8 ZnLa(PO 4 ) 7 :Eu 3+ . However, some of the red phosphor has poor thermal stability.…”

(3+1)-Dimensional Modulated Structure and Tb3+-Doped Luminescence for Vanadate Na3La(VO4)2

“…Because the prepared single crystals are very small, the intensity of X-ray diffraction is not very strong or the modulation is not actually strong. The modulation in Na 3 La­(VO 4 ) 2 is not as strong as that in other (3 + 1)­D modulated structures, including K 8 Nb 7 P 7 O 39 and Cr 2 P 2 O 7 . The reason is that the average structures of both K 8 Nb 7 P 7 O 39 and Cr 2 P 2 O 7 do not seem very crystallographically reasonable.…”

Novel tantalum phosphate Na13Sr2Ta2(PO4)9: synthesis, crystal structure, DFT calculations and Dy3+-activated fluorescence performance

“…As an important family of phosphors, rare-earth phosphate-based phosphors have been developed due to their excellent properties, such as low cost, good chemical stability, low synthesizing temperature and environmental benignity. This research effort originated from a large number of research papers on new efficient phosphors, including K 2 Ba 3 (P 2 O 7 ) 2 :Ce 3+ /Tb 3+ (Meng et al, 2017), ALnP 2 O 7 :Eu 3+ (A = Rb, Cs, TI; Ln = Y, Lu, Tm; Mbarek, 2017), K 8 Nb 7 P 7 O 39 :Eu 3+ (Zhao et al, 2016), Na 3 La(PO 4 ) 2 :Eu 3+ /Tb 3+ /Dy 3+ (Zhao et al, 2017), K 3 Gd(PO 4 ) 2 : Sm 3+ (Gupta et al, 2015), KBaBP 2 O 8 :Dy 3+ (Han et al, 2015), Ba 3 P 4 O 13 :Eu 2+ (Wu et al, 2018), Ca 6 Ba(PO 4 ) 4 O:Eu 2+ (Ji et al, 2016), Ca 3 (PO 4 ) 2 :Eu 2+ (Ji et al, 2015), LaPO 4 :Eu 3+ (Gavrilovic et al, 2018), CdBaP 2 O 7 :Eu 2+ (Derbel et al, 2016), KBa 2 (PO 3 ) 5 :Sm 3+ (Zhao et al, 2018), Ca 6 BaP 4 O 17 :Ce 3+ (Komuro et al, 2015), RbZnPO 4 :Eu 3+ (Xin et al, 2015), Na(Ba/Sr/Ca)PO 4 :Eu 2+ (Bai et al, 2017) and Ca 9 Ce(PO 4 ) 7 : Mn 2+ ,Tb 3+ (Zhang, Li et al, 2017). The fundamental building unit of phosphate compounds is the PO 4 tetrahedron, which is flexible and can inhibit various coordination environments by altering the P-O bond lengths.…”