Journal of Physical Studies 12(4), Article 4603 [6 pages] (2008) DOI: https://doi.org/10.30970/jps.12.4603 LUMINESCENT SPECTROSCOPY STUDY OF THE LOW TEMPERATURE PHASE TRANSITIONS AND MECHANISMS OF ENERGY TRANSFER IN DMAAS:Cr$^{3+}$ CRYSTALS V. Kapustianyk{1,2}, M. Panasyuk{1}, M. Partyka{1,2}, V. Rudyk{1,2}, Z. Czapla{3}, V. Tsybulskyy{1} {1}Ivan Franko National University of Lviv, Scientific-Technical and Educational Center of Low Temperature Studies, 50, Drahomanov St., Lviv, Ukraine, UA--79005, {2}Ivan Franko National University of Lviv, Faculty of Physics, 50, Drahomanov St., UA--79005, Lviv, Ukraine {3}Institute of Experimental Physics, University of Wrocław, 9, Pl. M. Borna, 50-204 Wrocław, Poland e-mail: kapustianyk@yahoo.co.uk

The work is devoted to the study of optical and spectral properties of the (CH$_{3}$)$_{2}$NH$_{2}$Al(SO$_{4}$)$_{2}$$\times$6H$_{2}$O$\colon$Cr$^{3+}$ (DMAAS$\colon$Cr$^{3+}$) crystals. On the basis of the analysis of the photoluminescence spectra temperature evolution the occurence of low temperature phase transitions in the DMAAS$\colon$Cr$^{3+}$ at $T_{1}=75$ K has been confirmed. The conclusion about the localized center nature of the photoluminescence in such crystals was made and the luminescence quenching energy was calculated. As a result, the energy diagram of the Cr$^{3+}$ ions in DMAAS$\colon$Cr$^{3+}$ crystals has been refined.

PACS number(s): 64.70.Kb, 76.30.Fc, 77.80.Bh, 78.55.-m, 81.10.Dn

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