On the luminescence of Sn in MaCl crystals

Abstract

on the occasion of his 75th birthdayThe optical spectra of tin-doped NaCl crystals are investigated. Special attention is paid to the effects of concentration and thermal history of the crystals. Within aggregates the SnZ+ cation exhibits characteristic absorption and emission bands. The experimental data show that the tin ions present a double band emission specific for each of the dispersion states of the impurity in the crystal.On prksente les spectres optiques obtenus pour les cristaux de NaCl dop6s a11 Sn, en poursuivant spkcialement les effcts de concentration et du traitement thermique. Lc cation Sn2+ appartenant aux agrkgats montre des bandes d'absorption e t d'kmission charactkristiques. Les rksultats expkrimentaux indiquent clue les ions de Sn prksentent deux bandes d'6mission spkcifiques pour chaquo ktat de dispersion de l'impuretk dans Ie cristal.

Optical Properties of NaCl:Sn2+Phosphor Synthesized from Aqueous NaCl/SnCl2/HCl Solution

“…1,2 The energies of the A, B, and C absorption peaks are usually dependent on the metal and are typically modified by the host matrix material. Mȃrculescu et al 32 measured the PLE spectrum of a NaCl:Sn 2+ system at 80 K, and the obtained results, with the only exception of a slight blue-shift for each peak, were similar to those reported herein. For example, the A1 absorption peak was observed at ∼4.23 eV; this value is slightly larger than that obtained in our study (∼4.125 eV).…”

“…The PLE spectrum for the B2 emission band suggests that this process possesses an intermediate nature between the A T and A X bands. Mȃrculescu et al 32 measured the PL spectra of Bridgman-grown NaCl:Sn 2+ crystals and observed four distinct PL bands at ∼440, ∼490, ∼540, and ∼585 nm, with their relative intensities depending on both the Sn 2+ concentration and thermal history of the crystals. They concluded that the ∼440 and ∼540 nm emission bands (named the A T and A X bands) resemble those A T and A X bands observed in alkali halide phosphors doped with Tl + -like ions.…”

“…30 However, complete studies on the PL properties of Sn 2+ -activated NaCl phosphors are scarce in the literature. [31][32][33] Kynev and Tabakova 31 studied the effects of divalent cation additives (Mg 2+ , Ca 2+ , Sr 2+ , Ba 2+ , Zn 2+ , and Cd 2+ ) on the PL and PL excitation (PLE) properties of NaCl:Sn 2+ phosphor. The addition of such divalent cations along with the Sn 2+ activator caused significant changes in both the PL and PLE properties of the phosphor.…”

“…Mȃrculescu et al 32 investigated the PL and PLE properties of a Bridgman-grown NaCl:Sn 2+ phosphor with particular emphasis on the effects of concentration and thermal history of the crystals. The aggregation centers formed in NaCl:Sn 2+ showed absorption and emission bands different from those of isolated Sn 2+ − V − Na (cation vacancy) dipoles.…”

Excitation Energy Transfer from Ce3+to Sn2+in NaCl Phosphor

“…The aggregation centers formed in NaCl:Sn 2+ are also known to show absorption and emission bands different from those of isolated Sn 2+ − V − Na dipoles. 36 Recently, we observed quenching rather than enhancement in the Sn 2+ emission intensity with the addition of Ce 3+ in the KCl host. In some phosphors, "killer" or "quencher" ions can be intentionally added for the purpose of reducing emission decay time, thereby obtaining a fast-decay phosphor at the expense of emission intensity.…”