IDENTIFICATION OF NEAR-INFRARED CR2+ LUMINESCENCE IN ZNSE

A Cr-related near-infrared photoluminescence (PL) band in ZnSe with a main no-phonon line at 10 702.2 cm(-1) is investigated. Zeeman splitti ng indicates a tetragonally distorted ground state. The experimental d ata agree well with calculations using a spin Hamiltonian with paramet ers obtained from the T-5(2)(D) ground state of ZnSe:Cr2+(d(4)). This contradicts a former assignment of the PL band to a T-4(1)(G) --> (6)A (1)(S) emission of ZnSe : Cr+(d(5)). Crystal field calculations demons trate that the observed no-phonon lines and the corresponding luminesc ence band can reasonably be interpreted in terms of a T-3(1)(H) --> T- 5(2)(D) transition within the d(4) configuration of Cr2+. Furthermore, the influence of unmodulated supplementary irradiation on transmissio n and PL excitation spectra is discussed.