Eu2+ and Ce3+ emission in sulphate based phosphors

Eu3+ (orange/red) luminescence in LiXSO4Cl (X = Mg, Zn) halosulfate phosphor

“…In Gedam et al [10] explanation has been offered as to how divalent europium is incorporated. No explanation has been given to incorporation of pure Eu 3+ ion in halosulfate-based phosphors.…”

“…From this emission spectrum, it can be observed that the fluorescence intensities ratio of gives rise to Eu 2+ luminescence in alkaline halosulfate phosphor. [10] The observed red shift in the emission spectrum on substitution of Li ion with Mg or Zn can be explained as follows: the lattice parameter of the substituted sample is excitation bands, as well as the emission band being higher than in the unsubstituted sample. As a result, the Eu…”

“…Recently Gedam et al reported incorporation Eu 2+ ion in halosulfate phosphors. [10] The presence of lithium ion gives Eu 3+ emission in the halosulfate phosphors and they are technologically simple to obtain and conform at low cost even for large sizes. Among the different techniques employed to prepare these materials, the wet chemical process appears a promising route.…”

Resonant energy transfer from Ce3+→Dy3+ and Mn2+ in NaZnSO4Cl chlorosulphate phosphor

“…Much works have been done on the energy transfer from Ce 3 þ to different activator ions in different host lattices [12][13][14][15]. In recent years we have reported several phosphors on rare earth (RE) ions doped mixed sulfate [16][17][18][19][20][21][22][23][24] and showed how those ions can exist in different valence states, as result to irradiation, which can induce valence changes. It has been verified that under irradiation the doped ions in the crystal can cause defects easily and form color centers, the doped ions in the crystal act as trapping sites by capturing electrons or holes that are produced by irradiation, which change the chemical valence of doped ions.…”

5D0→7F1 and 5D0→7F2 transition in europium doped halosulphates for mercury-free lamps

“…They have synthesized and characterized K 2 Ca 2 (SO 4 ) 3 :Eu, Dy [25] and K 2 Ca 2 (SO 4 ) 3 :Eu [26]; LiNaSO 4 :Eu [27], LiNaSO 4 :Eu, Dy [28] mixed sulphates. Recently, we have studied some phosphors [29][30][31][32][33][34].…”