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Journal of Physical Studies 4(4), 464–469 (2000)
DOI: https://doi.org/10.30970/jps.04.464 SPECTROSCOPY OF Cs2ZnI4:Mn AND Rb2ZnI4:Mn CRYSTALSO. M. Berdychevsky, V. V. Vistovsky, I. P. Pashuk, M. S. Pidzyrailo
Ivan Franko National University of Lviv, Department of Physics,
8 Kyrylo i Mefodii Str., Lviv, UA–79005, Ukraine |
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Reflection, emission and excitation spectra of the $A_2$ZnI$_4$:Mn$^{2+}$ ($A$ = Cs, Rb) crystals are reported. Measurements were carried out in the temperature range of 77-300 K. From the reflection spectra the band gaps and the exciton positions were defined. Emission spectra in both cases consist of the green single band at 18285 and 18309 cm$^{-1}$ respectively for Cs$_2$ZnI$_4$:Mn and Rb$_2$ZnI$_4$:Mn. A detailed analysis with the assignment of excitation bands to the electronic transitions in Mn$^{2+}$ impurity is given. Calculations were carried out using Tanabe-Sugano and Curie formalism. The parameters $B$, $C$ and $Dq$ for the Cs$_2$ZnI$_4$:Mn and Rb$_2$ZnI$_4$:Mn crystals in tetrahedral coordination of the impurity ion were also defined in the paper.
PACS number(s): 78.55.Fv, 61.72.-y, 81.10.Fq