Luminescence characteristics of the Rb2CdI4 crystal

Autor: O. M. Berdychevsky, V. V. Vistovsky, M.S. Pidzyrailo, I.M. Bolesta, M.V. Storchun
Rok vydání: 2000
Předmět:
Zdroj: Optics Communications. 184:169-174
ISSN: 0030-4018
Popis: Optical reflection spectra of Rb2CdI4 single crystals were measured in the region of exciton creation at temperatures 77–250 K. Band gap width (Eg=4.927 eV), binding energy (F=0.390 eV) and radius (rex=4.43 A) of excitons were determined. Emission spectra at excitation in the exciton absorption bands and at band-to-band transitions were studied in the temperature region 8–300 K. The π- and σ-emission bands of the self-trapped exciton have observed at 3.06 and 3.44 eV, respectively. The temperature dependencies of intensities of excitation bands of Mn2+ centres in the region of intrinsic absorption give evidence of the existence of two additional bands, connected with the localization of excitons near impurity centres.
Databáze: OpenAIRE