ЛЮМИНЕСЦЕНЦИЯ И ОБРАЗОВАНИЕ ЭЛЕКТРОННО-ДЫРОЧНЫХ ЦЕНТРОВ ЗАХВАТА В ЛЮМИНОФОРЕ CaSO₄–Bi

В люминофоре CaSO₄ −Bi  исследованы механизмы создания нового комбинированного электронно-дырочного состояния при 2,95 эВ, 3,1 эВ, 2,6–2,7 эВ и 2,25–2,4 эВ, которое является предраспадным состоянием для передачи энергии от матрицы к излучателям.

По данным исследования спектроскопическими методами и методами термической активации комбинированные электронно-дырочные состояния формируются из собственных SO₄³⁻ − SO₄⁻ и примесных Bi²⁺ −SO₄⁻ электронно-дырочных центров захвата. В свою очередь, собственные и примесные электронно-дырочные центры захвата создаются при возбуждении анионного комплекса SO²₄⁻ в результате переноса заряда с матрицы на примеси (_О²⁻ − _Bi³⁺ ) и соседние анионы (О²⁻ − SO₄²⁻ ).

Показано, что энергия, накопленная в собственной матрице при внешнем облучении в виде объединенного электронного излучательного состояния SO₄³⁻ и Bi²⁺ , распадается в результате процесса рекомбинации и передается примесям.

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