Alkali halide crystals containing impurity ions with the ns2 ground-state electronic configuration†

Defects generated by irradiation with gamma rays in lead doped KCl–KBr mixed single crystals

“…We must recall here that these absorption bands have been attributed to the 1 A1g → 3 T1u( 3 P1) electronic transition of the Pb 2+ ion in the mixed matrix (Jacobs, 1991). A comparison with the TL and PL spectra indicates that the TL spectrum contains most of the PL band, meaning the direct participation of the Pb 2+ impurity in the TL recombination process.…”

“…The Pb 2+ ion induces a set of absorption bands called A, B and C due to the electronic excitation of the impurity. In the particular case of Pb 2+ ion in KCl and KBr the A band is attributed to the 1 S0 → 3 P1 transition of the 6s 2 − 6s6p electronic conÿguration (Jacobs, 1991). These bands are located in 270 and 290 nm in KCl : Pb 2+ and KBr : Pb 2+ , respectively, with corresponding emission bands.…”

Optical properties of KCl:Sn2+ phosphors synthesized from aqueous KCl/SnCl2 solutions

“…In melt-grown alkali halide phosphors activated with monovalent ions such as In þ and Tl þ , two PL emission bands have been observed and are referred to as A T and A X . 4,6,19 Similarly, two emission bands have been observed in Sn 2þ -doped NaCl, KBr, and KI, 13,20,26,29 and are referred to as A T and A X (A T and R). However, only an A T emission band has been observed in melt-grown KCl:Sn 2þ phosphors.…”

“…[1][2][3][4][5][6][7][8][9][10][11] However, the analysis of the photoluminescence (PL) properties has not yet been completed owing to their structureless broadband spectra and unknown site symmetries in the host lattice. 12 There have been many studies on the PL properties of Sn 2þ -activated alkali halides, such as NaCl:Sn 2þ , 13,14 KCl:Sn 2þ , [15][16][17][18] KBr:Sn 2þ , 16,[19][20][21][22] and KI:Sn 2þ .…”

Luminescence properties of Sn-containing microcrystals in CsBr:Sn crystal

“…2c). This fact has allowed us to compare these bands with the intra-centric transitions in Sn 2+ ion [9] and indicate them as A, B and C bands, respectively. As a result, the band peaked at 605 nm can be ascribed to the luminescence of single Sn…”