LiEuMo2O8 – crystal growth, structure, and optical properties

Synthesis, Crystal Structure, and Magnetic Properties of Pyrochlore‐Type Eu2Ta2(O,N)7+δ

“…The fitted coupling constant is furthermore in good agreement with other Eu 3+ compounds in the literature (EuF 3 : λ = 490 K; EuBO 3 : λ = 471 K [26] ). Similar magnetic behavior has been observed for Eu 2 Ir 2 O 7 , [27] LiEuMo 2 O 8 , [18] Eu 2 Cl 5 (OH)(H 2 O)(terpy), [28] Sr 2 EuNbO 6 , [29] EuOOH, [30] or EuPO 4 . [17]…”

“…The spectrum could be well reproduced with a single signal at an isomer shift of δ = 0.62(1) mm · s –1 , subjected to quadrupole splitting of Δ E Q = –4.2(2) mm · s –1 . The isomer shift is clearly indicative for purely trivalent europium (no signal intensity around –10 mm · s –1 for a divalent europium species), similar to EuAsO 4 [ δ = 0.49(1) mm · s –1 ] or LiEuMo 2 O 8 [ δ = 0.52(1) mm · s –1 ] . The quadrupole splitting parameter and the slightly enhanced experimental line width of Γ = 2.91(6) mm · s –1 reflect the statistical O/N coordination of the europium cations.…”

“…The isomer shift is clearly indicative for purely trivalent europium (no signal intensity around -10 mm•s -1 for a divalent europium species), similar to EuAsO 4 [δ = 0.49(1) mm•s -1 ] [17] or LiEuMo 2 O 8 [δ = 0.52(1) mm•s -1 ]. [18] The quadrupole splitting parameter and the slightly enhanced experimental line width of Γ = 2.91(6) mm•s -1 reflect the statistical O/N coordination of the europium cations.…”

Optical Properties of Red-Emitting Rb2Bi(PO4)(MoO4):Eu3+ Powders and Ceramics with High Quantum Efficiency for White LEDs

“…This observation indicates that Eu 3+ ions occupy non-centrosymmetric lattice site in the Rb 2 Bi(PO 4 )(MoO 4 ) host matrix. On the other hand, the intensity difference between MD and ED transitions is rather low if compared to some other molybdate host matrices doped with Eu 3+ ions, for instance, Li 3 Ba 2 La 3 (MoO 4 ):Eu 3+ [31], Tb 2 Mo 3 O 12 :Eu 3+ [18], La 2 MoO 6 :Eu 3+ [32], LiEuMo 2 O 8 [33], La 2 Mo 2 O 9 :Eu 3+ [34] and so on. The rather small difference between ED and MD transitions of Eu 3+ ions in Rb 2 Bi(PO 4 )(MoO 4 ) host matrix can be assigned to relatively symmetric dodecahedral BiO 8 site, which is occupied by Eu 3+ .…”

Eu2(CN2)3 and KEu[Si(CN2)4]: Missing Members of the Rare Earth Metal Carbodiimide and Tetracyanamidosilicate Series

“…The extent of energy migration is closely related to the crystal structure. There are only few reports on compounds comprising a trivalent site occupied by 100 % Eu 3+ with high quantum efficiency, for example, EuTa 7 O 19 , EuP 5 O 14 , and LiEuMo 2 O 8 . Because of the large separation and low‐dimensional arrangement of the trivalent RE ions, these compounds show a high critical concentration.…”