LINE-SHAPE, LINE-WIDTH, AND CONFIGURATION COORDINATE DIAGRAM OF THE CU BAND (1.21 EV) IN INP - COMMENT

A recent article by Pal and Bose [J. Appl. Phys. 78, 5206 (1995)] repo rts a photoluminescence measurement of the Cu-related 1.2 eV optical e mission band in InP. By applying the configuration coordinate (CC) mod el they concluded that the ground-state phonon energy of the recombina tion center involved with this band is exactly the same as the TO phon on energy 38 meV at the Gamma point. Also, it was concluded that for t he CC model to be consistent with other experimental data presented, o ne should assume that in the CC diagram the phonon energies for the gr ound state hv(g) and for the excited state hv(e), respectively, are si gnificantly different. We have reanalyzed part of their data and argue that the conclusions may not be warranted. (C) 1996 American Institut e of Physics.