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Optical absorption and thermoluminescence studies on LiF–Sb2O3–B2O3 glasses doped with Ni2+ ions

“…Thus this process leads to the formation of (1) boron/antimony E centres, (2) non-bridging oxygen hole centres, (3) boron/ antimony oxygen hole centres TL is a radiative recombination between the electrons (released by heating from an electron centre) and an antibonding molecular orbital of the nearest of the hole-centre. However, the TL emission due to such recombinations especially in borate glasses is possible only at low temperature at about 140 K as reported earlier [33,34]. Previous experiments by Pontuschka et al [33], on luminescence studies of barium aluminoborate glasses containing transition metal ions suggest that even after the complete release of electron centres either by thermal or optical bleaching at low temperature, a strong ESR signal due to hole centres was observed indicating still there is a fraction of holes that has escaped the direct e À -h + recombination.…”

“…However, the TL emission due to such recombinations especially in borate glasses is possible only at low temperature at about 140 K as reported earlier [33,34]. Previous experiments by Pontuschka et al [33], on luminescence studies of barium aluminoborate glasses containing transition metal ions suggest that even after the complete release of electron centres either by thermal or optical bleaching at low temperature, a strong ESR signal due to hole centres was observed indicating still there is a fraction of holes that has escaped the direct e À -h + recombination. The observed TL emission in the present glasses at about 220 1C may be attributed due to such remaining holes released due to heating and their subsequent recombination with the electrons previously captured by nearest metal ion impurity.…”

Influence of modifier oxide on spectroscopic and thermoluminescence characteristics of Sm3+ ion in antimony borate glass system

“…We have obtained the highest value of this parameter for ZnO mixed glasses; this observation points out that zinc ions by and large occupy network-forming positions and result a strong field around Sm 3+ ion and minimize Sm-O average distance. In such a case the Sm 3+ ions may play an intermediate role in the recombination reaction either through bypassing or by resonant energy condition, leading to a decrease in the radiative transitions [22,23,47]. The comparatively low values of O 2 obtained for the CaO glasses predicts a low concentration of such non-radiative recombinations for CaSm glass as observed.…”

“…PbO, ZnO and CaO; the study is further intended to throw some light on the relationship between the structural modifications and luminescence efficiencies. Recently, the study on thermoluminescence (TL) properties of the glasses is also being used as a powerful tool to throw some light on the environment of dopant ions [22,23] in the glasses. Additionally, this study may also be useful to examine the suitability of the material for dosimetry applications.…”

Thermoluminescent properties of a Li2O–B2O3–Al2O3 glass system doped with CaF2 and Mn

“…Borate glass subjected to ionizing radiation has been studied because its effective atomic number is close to that of human tissue (Z eff =7.42). In addition to these characteristics, borate glass is inexpensive and easy to produce making it appropriate for ionizing radiation dosimetry [5][6][7][8][9][10][11].…”