TEMPERATURE EVOLUTION OF EXCITONIC LUMINESCENCE IN NITROGEN-DOPED ZINC SELENIDE

The temperature evolution of the luminescence due to excitons was stud ied in nitrogen doped zinc selenide using time-resolved and time-integ rated photoluminescence (PL) techniques, The luminescence decay time o f the acceptor bound exciton was found to be constant at temperatures below 14 K with a value of similar to 430 ps and then decreased with t emperature, with an activation energy of 13 meV, By comparison with th e PL spectrum, the decrease was identified as due to the thermalizatio n of the bound exciton into a free exciton and a neutral acceptor, The temperature evolution of the PL data shows that the donor bound excit on luminescence increases with reference to the deeper acceptor bound exciton luminescence, and this is explained using a kinetic model. (C) 1997 American Institute of Physics.