论文信息 - On the properties of cobalt impurities in zinc selenide crystals II. The optical properties in near‐infrared. 4A2(4F) ↔ 4T2(4F) Transitions

On the properties of cobalt impurities in zinc selenide crystals II. The optical properties in near‐infrared. 4A2(4F) ↔ 4T2(4F) Transitions

Absorption and luminescence spectra due to the 4A2(4F) 4T2(4F) crystal field transitions in ZnSe:Co2+ are presented. It is shown that the structure of the absorption band is caused by the spin-orbit interaction within the 4T2(4F) state and the coupling to the lattice modes of A1 symmetry. According to a model proposed for the thermal depopulation of the excited 4T2(4F) state, the ionization energy of the Co2+ impurity in ZnSe is estimated to be about 5600 cm−1 (0.69 eV). Absorptions- und Lumineszenzspektren der 4A2(4F) 4T2(4F)-Kristallfeldubergange in ZnSe: Co2+ werden angegeben. Es wird gezeigt, das die Struktur der Absorptionsbande durch Spin-Bahn-Wechselwirkung innerhalb des 4T2(4F)-Zustands und Kopplung mit Gittermoden mit A1-Symmetrie verursacht wird. Entsprechend einem Modell, das fur thermische Entvolkerung des angeregten 4T2(4F)-Zustands vorgeschlagen wurde, wird die Ionisierungsenergie der Co2+-Storstelle in ZnSe zu etwa 5600 cm−1 (0,69 eV) berechnet.

A. Radlinski

[1] A. Radlinski. On the properties of cobalt impurities in zinc selenide crystals. I. Effect of in-band position of states on photoelectric properties , 1977 .

[2] G. L. Pearson,et al. Evidence for two channel excitation of luminescence in CdF2:Mn , 1974 .

[3] P. Koidl,et al. Near-Infrared Absorption of Co 2 + in ZnS: Weak Jahn-Teller Coupling in the T 2 4 and T 1 4 States , 1973 .

[4] J. C. Irwin,et al. Phonon Dispersion in ZnSe , 1972 .

[5] B. Hennion,et al. Normal modes of vibrations in ZnSe , 1971 .

[6] G. A. Slack,et al. Infrared Absorption and Luminescence Spectra of Fe 2+ in Cubic ZnS: Role of the Jahn-Teller Coupling , 1971 .

[7] C. Henry,et al. EFFECT OF APPLIED FIELDS ON THE OPTICAL PROPERTIES OF COLOR CENTERS , 1964 .

[8] R. K. Swank,et al. Lifetime of the Excited F Center , 1963 .