Abstract
Low-temperature (1.8 K) excitonic absorption, reflection and photoluminescence spectra of mixed Zn(P 1− x As x ) 2 crystals have been studied at x=0.01, 0.02, 0.03 and 0.05. Energy gap and rydbergs of excitonic B, C and A-series decrease monotonically with the increase of x. Spectral half-widths of absorption n=1 lines of B and A-series increase monotonically with the increase of x due to fluctuations of crystal potential. Emission lines of excitonic molecules have been observed in photoluminescence spectra of Zn(P 1− x As x ) 2 crystals. Binding energy of molecule increases with the increase of x due to the decrease of the electron-hole mass ratio.
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