Journal
JOURNAL OF LUMINESCENCE
Volume 131, Issue 5, Pages 956-959Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jlumin.2010.12.031
Keywords
ZnSeTe; Type-II quantum well; Time-resolved photoluminescence; Exciton
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Funding
- MOE-ATU
- National Science Council [NSC 95-2112-M-009 -047]
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The tunability of the emission energy, oscillator strength and photoluminescence (PL) efficiency by varying the well thickness and excitation density was demonstrated in the ZnSe0.8Te0.2/ZnSe multiple quantum wells. A significant blueshift about 260 meV of the PL peak energy was observed as the well width decreased from 5 to 1 nm. An extraordinary long lifetime (300 ns) of the recombination for the widest sample was detected. The binding energy of the indirect excitons is determined as 12 meV for the thinnest sample. The reduction of PL efficiency by thermal energy is greatly suppressed by employing a high excitation power. Crown Copyright (C) 2011 Published by Elsevier B.V. All rights reserved.
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