Novel red phosphors for solid-state lighting: the system NaM(WO4)2−x(MoO4)x:Eu3+ (MGd, Y, Bi)

Preparation and Photoluminescence Properties of Transparent Red-Emitting Suspension of BaMoO4:Eu3+,Na+Nanophosphor for a Three-Band White LED

“…[7][8][9][10] CaS:Eu 2+ , Ba 2 Si 5 N 8 :Eu 2+ , NaY(W,Mo) 2 O 8 :Eu 3+ , CaMoO 4 :Eu 3+ , and Y 2 (MoO 4 ) 3 :Eu 3+ have been used redemitting phosphors for three-band white LED because these phosphors show strong absorptions at 465 nm and strong emissions in the red region. [11][12][13][14][15][16] Most of these phosphors can be synthesized by simple solid state reactions, and a few micron-sized phosphors have been obtained. When micronsized inorganic phosphors are coated on a blue LED chip, a large fraction of the blue light is lost by back scattering due to the micron-sized phosphors.…”

Inorganic Phosphor Materials for Lighting

“…As mentioned above, molybdate, tungstate, niobate, and tantalate hosts activated with Eu 3? have been widely investigated [151][152][153][154][155][156][157][158][159][160][161][162][163][164][165][166][167], also exploting co-doping with Sm 3? , but only in a limited number of cases the two strategies described above (high Eu 3?…”

Luminescent Eu3+-doped NaLa(WO4)(MoO4) and Ba2CaMoO6 prepared by the modified Pechini method

“…M6(W,Mo)O12:Eu 3+ (M = Y, Gd, Lu) and AB(W,Mo)O6:Eu 3+ (A = Ca, Sr, Ba; B = Mg, Ca) crystallize in structures with MoO6 groups, where the NUV excitation is enhanced via energy transfer from the host material. The most common synthesis route for these materials is solid state reaction [3,[11][12][13]17,10,19], mainly because of the simplicity of the method, such as no need for soluble precursors or advanced equipment. However, several grindings and re-firings are often necessary to achieve phase purity, and the process readily introduces impurities and defects which would reduce luminous efficacy [20].…”

“…However, the technology is limited by the lack of a stable and efficient red phosphor. A much researched group of novel red phosphor materials are the Eu 3+ doped oxides of Mo and W, including compounds such as Ca(W,Mo)O4:Eu 3+ ,Li + [1,2], M + M 3+ (WO4)2−x(MoO4)x:Eu 3+ (M + = Li, Na, K; M 3+ = La, Gd, Y, Lu, Bi) [3][4][5], M6(W,Mo)O12:Eu 3+ (M = Y, Gd, Lu) [6][7][8][9] and AB(W,Mo)O6:Eu 3+ (A = Ca, Sr, Ba; B = Mg, Ca) [10][11][12][13][14][15][16][17][18]. The first two compounds crystallize in the scheelite structure, where there is enhancement of NUV excitation due to non-centrosymmetric lattice sites.…”