Photoluminescence excitation spectra of disordered superlattices

We investigate photoluminescence excitation (PLE) and selective photoluminescence (SPL) of ordered and disordered superlattices, showing that the coexistence of localized and extended states in disordered superlattices produces a dramatic dependence of the PLE spectra on the detection energy. We demonstrate that the PLE of disordered superlattices gives ambiguous information on joint density of states, and we use SPL in order to show that this effect is a consequence of the localization and of the lack of thermal equilibrium in disordered systems. (C) 1998 Elsevier Science B.V. All rights reserved.


Published in:
Journal of Luminescence, 78, 4, 259-264
Year:
1998
ISSN:
0022-2313
Keywords:
Note:
Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. Univ Bari, Dipartmento Fis, I-70126 Bari, Italy. INFM, I-70126 Bari, Italy. Ecole Polytech Fed Lausanne, Dept Phys, CH-1015 Lausanne, Switzerland. Lorusso, GF, Univ Calif Berkeley, Lawrence Berkeley Lab, 1 Cyclotron Rd, Berkeley, CA 94720 USA.
ISI Document Delivery No.: ZV487
Times Cited: 0
Cited Reference Count: 13
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