Investigation of regularities of photoluminescence centers formation in Fe2+ doped CVD-ZnSe by the two-photon confocal microscopy method

5^th World Congress on Materials Science & Engineering

June 13-15, 2016 Alicante, Spain

N A Timofeeva, E M Gavrishchuk, V B Ikonnikov, D V Savin, A A Gladilin, V P Kalinushkin and O V Uvarov

1G.G. Devyatykh Institute of Chemistry of High-Purity Substances, Russian Academy of Sciences, 49 Tropinina Str., 603950 Nizhny Novgorod, Russia
A.M. Prokhorov General Physics Institute, Russian Academy of Sciences, 38 Vavilova Str., 119991 Mos

Scientific Tracks Abstracts: J Material Sci Eng

Abstract :

ZnSe crystals doped by Fe2+ are used as an active medium of lasers operated in the 3.5-5 �?¼m spectral range. The characteristics of the medium important for laser applications depend not only on the nature and concentration of the doping component, but to a great extent on the type of the intrinsic or impurity defects of material. Such defects are defined by the conditions of crystal growth and also by the subsequent high temperature treatment, employed for matrix doping by active impurities. In this work, the unique technique of doping was developed and CVD-ZnSe samples with different Fe2+ concentration profiles were manufactured. The effective concentration of Fe2+ ions was at the 1019 at/cm3 level. The two-photon confocal microscopy method was used for investigating the nature and character of changes in the distribution of band-to-band and defect-impurity photoluminescence (PL) centers directly in the bulk of Fe2+: ZnSe polycrystals. The two-photon excitation was realized by a laser operated in the 0.75-1 �?¼m range at room temperature, the PL spectra were registered in the 425-725 nm range. As a result, the PL â�?�?volumeâ�? maps of Fe2+: ZnSe polycrystalline samples were recorded reaching a depth up to 1 mm with a step 25 �?¼m and a size of plane area 1�?�?1 mm. The investigation of the maps reveals the regularities of PL centers formation in the bulk and at grain boundaries in the polycrystalline CVD-ZnSe due to the concentration of Fe2+ ions. The work was supported by the RSF grant â�?�?15-13-10028.

Biography :

N A Timofeeva has received the degree of MSc at R.E. Alekseev Nizhny Novgorod State Technical University, Russia. She is currently doing her PhD program at G.G. Devyatykh Institute of Chemistry of High-Purity Substances, Russian Academy of Sciences. The PhD focuses on the synthesis of polycrystalline zinc chalcogenides ZnSe and ZnS doped by iron for active medium of solid-state lasers. She has 7 publications in this field.

Email: timofeeva@ihps.nnov.ru