Hydrostatic and uniaxial pressure coefficients of CdTe

The pressure dependence of direct band-gap CdTe has been measured by observing the direct exciton photoluminescence and donor-acceptor pair photoluminescence under hydrostatic pressures up to 35 kbar. A value of 6.5±0.2 meV ${\mathrm{kbar}}^{-1\mathrm{}}$ was obtained corresponding to a hydrostatic deformation potential $\Xi =2.74\mathrm{}\pm 0.09$ eV. Using this value, the uniaxial stress data of Thomas J. Appl. Phys. 32, 2298 (1961) is reassessed to determine a best value of $\Delta =8.7\mathrm{}\pm 0.3$ meV ${\mathrm{kbar}}^{-1\mathrm{}}$, corresponding to $D_u=1.11\mathrm{}$ eV and $D_{u^{\prime }}=2.57\mathrm{}$ eV.