Browsing by Author "Caraman, Iu."

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    OPTICAL PROPERTIES OF COMPOUNDS WITH SUBMICRON POINTS OBTAINED THROUGH Ga2S3 INTERCALATION WITH Cd
    (Universitatea de Stat „Alecu Russo“ din Bălţi, 2012) Racoveț, O.; Evtodiev, I.; Caraman, Iu.; Rotaru, I.; Lazăr, G.
    Luminescence and optical absorption spectra of Ga2S3 single crystals were investigated at temperatures of 78 K and 293 K. Optical band gap is equal to 3.27 eV and 3.457 eV at 293 K and 78 K respectively. Luminescence spectrum of single crystal lamellas at temperature of 78K consists of three bands with peaks at 2.04 eV, 1.84 eV and 1.66 eV.Native structural defects form deep recombination and electronic capture levels localized within the Ga2S3 band gap.
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    PREPARATION AND OPTICAL PROPERTIES OF LAMELLAR GaSe -ZnSe NANOCOMPOSITES
    (2015) Caraman, M.; Untila, D.; Canțer, V.; Evtodiev, Igor; Caraman, Iu.; Susu, O.; Leontie, L.
    ZnSe-GaSe nanocomposite plates photoluminescent in a photon energy range of 1.80−2.64 eV were obtained via exposing GaSe single-crystal plates to a Zn-vapor heat treatment at temperatures of 673−873 K. The photoluminescence spectrum is dominated bythe self-activated emission band of ZnSe witha maximum at 2.04 eV. The average size of the ZnSe crystallites is ~45 nm. The absorption spectrum of the composite consists of two regions characteristic of direct optical transitions in GaSe crystals with a band gap of 1.99 eV and ZnSe crystallites with aband gap of 2.56 eV at room temperature.