Abstract
AbstractPhotoluminescence (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.
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