Tunneling recombination luminescence in KBr and KCl

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The tunneling recombination luminescence bands with maxima at 550 nm in KBr and 500 nm in KCl are due to electron tunneling transitions between the ground states of F and V k centres. The emission of σ excitons occurs as a result of electron tunneling transitions from an electron centre (presumably an F' centre) to an excited state of the (V k + electron) system. The KBr tunnel luminescence decay data are consistent with an isolated pair model, below critical X-ray excitation doses and at temperatures ranging from 100 to 150 K.