Preparation, crystal structure, and photoluminescence of Ca2SnO4:Eu3+, Y3+

The origin of two quenching concentrations and unusual afterglow behaviors of Ba2SnO4:Sm3+ phosphor

“…It is noted that the emission quenching curve shows two critical quenching concentrations of Sm 3 þ at 0.07% and 7%. This observation is unusual and far different from the previous reports on single quenching concentration of phosphors [6][7][8][9]11]. of afterglow time on Sm 3 þ concentrations.…”

“…In recent, the materials with (SnO 4 ) 4À anions and inverse spinel structure have been reported to be good host for afterglow [4][5][6][7]. Thus, it is expected that we may obtain some new afterglow materials by doping different rare earth ions into M 2 SnO 4 (M¼Ca 2 þ , Sr 2 þ , Ba 2 þ and Mg 2 þ ) as activators [6][7][8][9][10].…”

Novel porous CaSnO3:Eu3+ and Ca2SnO4:Eu3+ phosphors by co-precipitation synthesis and postannealing approach: A general route to alkaline-earth stannates

“…The SnO 4 anions involved in Ca 2 SnO 4 are optically inert, and it could be a candidate for host materials [7][8]. Ca 2 SnO 4 :Eu 3+ ,Y 3+ phosphors were synthesized through solid state reaction between SnO 2 and CaCO 3 at 1400 • C for 12 h [9]. But this synthetic method needs a higher thermal treatment temperature and produces a lower chemical homogeneity.…”

Quantitative determination of site occupancy of multi-rare-earth elements doped into Ca2SnO4 phosphor by electron channeling microanalysis

“…Chen et al presented the solution limit of Eu (x) at x¼ 0.07 for (Ca 1 À x Eu x ) 2 SnO 4 (but it may be better to denote as (Ca 1 À 1.5x Eu x ) 2 SnO 4 , taking Ca vacancies into account) by X-ray powder diffraction, the chemical formula of which takes the charge balance into account instead of considering the possibility that some Sn 4 + could be reduced to Sn 2 + . After these studies, however, solid state reaction synthesis and Rietveld analysis of powder X-ray diffraction (XRD) pattern by Yamane et al revealed that Eu 3 + equally occupies both the Ca 2 + and Sn 4 + sites [5]. The solid solution range of Ca 2 À x Eu 2x Sn 1 À x O 4 was shown to be 0ox r0.3.…”