Zero-Phonon Lines and Phonon Coupling of ZnSe: Mn and CdS: Mn

Abstract

Absorption and emission spectra of ZnSe: Mn and of CdS: Mn crystals were measured at 4.2\ifmmode^\circ\else\textdegree\fi{}K. The structure on the absorption and emission bands was identified in terms of phonon emission coupled to one electronic transition in each band. Zero-phonon lines were found in ZnSe: Mn at 18 025, 19 598, and 21 110 ${\mathrm{cm}}^{\ensuremath{-}1}$ and in CdS: Mn at 18 620 ${\mathrm{cm}}^{\ensuremath{-}1}$. They should correspond to the Mn transitions in a cubic crystalline field $^{6}A_{1}\ensuremath{\rightarrow}^{4}T_{1}$, $^{6}A_{1}\ensuremath{\rightarrow}^{4}T_{2}$, and $^{6}A_{1}\ensuremath{\rightarrow}^{4}A_{1}, ^{4}E$ in ZnSe. The ionic parameters ${F}_{2}=55454$ and ${F}_{4}=34520$ ${\mathrm{cm}}^{\ensuremath{-}1}$ and the value of the crystalline field, $Dq=405$ ${\mathrm{cm}}^{\ensuremath{-}1}$, are deduced for Mn in ZnSe. Principal phonons participating have values of about 70, 94, 160, 209, and 242 ${\mathrm{cm}}^{\ensuremath{-}1}$, which is in agreement with the phonon energies of the ZnSe host lattice.