Composition dependence of phonon wavenumbers in Zn1-xBexSe alloys

Zn1-xBexSe alloys have recently been grown for applications to ZnSe-based b lue laser diodes. We have used Raman scattering to investigate the phonon m odes of this new alloy system for 0 less than or equal to x less than or eq ual to 0.13. This alloy shows a two-mode behavior. The Raman data have been analyzed by using a modified random-element-isodisplacement model, and sev eral characteristic phonon frequencies have been determined for the first t ime. The local mode frequency of Be in ZnSe is 447 cm(-1), and that of Zn i n BeSe is 210 cm(-1). The LO phonon frequency of BeSe has an upper bound of about 510 cm(-1).