Pressure dependence of photoluminescence of ZnTe/Zn1?xCdxTe strained-layer superlattice

Autor: Xiwu Fan, Hong-Jiao Li, Zexiang Shen, W. S. Li, De-yan Shen
Rok vydání: 2001
Předmět:
Zdroj: Journal of Raman Spectroscopy. 32:847-851
ISSN: 1097-4555
0377-0486
DOI: 10.1002/jrs.767
Popis: Photoluminescence (PL) spectra of ZnTe/Zn1−xCdxTe (x = 0.23) strained-layer superlattice (SLS) samples were studied at hydrostatic pressures up to 4.8 GPa at room temperature. A sublinear pressure dependence of the PL peaks for both the heavy-hole exciton and the donor–acceptor pair was observed. The first- and second-order pressure coefficients of the PL peaks were obtained by a least-squares fit. An analytical expression for the heavy-hole exciton was also derived. The pressure coefficients obtained from the analytical expression are 104 meV GPa−1 and −4.44 meV GPa−2, in excellent agreement with the experimental values of 103.9 meV GPa−1 and −4.5 meV GPa−2. It is shown that the contribution to the linear pressure coefficient comes exclusively from the hydrostatic component. Both hydrostatic and biaxial terms are responsible for the second-order pressure coefficient, with a negative contribution of −6.07 meV GPa−2 and a positive contribution of 1.63 meV GPa−2, respectively. Copyright © 2001 John Wiley & Sons, Ltd.
Databáze: OpenAIRE
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