Photoacoustic Spectroscopy Of Co2+ In Znga2o4 And Mgga2o4

A photoacoustic study of cobalt-doped ZnGa2O4 and MgGa2O4 is presented. The observed visible bands are assigned to the spin-allowed electronic transition 4A2(4F)→4T1(4P). Comparison between the radiationless relaxation time, observed by the photoacoustic method, and the fluorescence decay time indicates that a radiation process is dominant for these samples. © 1994.2274-5485489Moulton, (1985) Laser handbook, 5, p. 203. , M. Bass, M.L. Stitch, North-Holland, AmsterdamFerguson, Wood, Van Uitert, (1969) J. Chem. Phys., 51, p. 2904Donegan, Bergin, Imbusch, Remeika, Luminescence from LiGa5O8:Co (1984) Journal of Luminescence, 31 (32), p. 278Macfarlane, Vial, (1986) Phys. Rev. B, 34, p. 1Abritta, Blak, Luminescence study of ZnGa2O4: Co24 (1991) Journal of Luminescence, 48 (49), p. 558Sosman, Abritta, (1992) Solid State Commun., 82, p. 801Deren, Strek, Oetliker, Güdel, Spectroscopic Properties of Co2+ Ions in MgAl2O4 Spinels (1994) physica status solidi (b), 182, p. 241Tanabe, Sugano, (1954) J. Phys. Soc. Japan, 9, p. 753Low, (1958) Phys. Rev., 109, p. 256Pappalardo, Wood, Linares, Jr., (1961) J. Chem. Phys., 35, p. 2041Hoffman, Brown, (1968) J. Inorg. Nucl. Chem., 30, p. 63Kahan, Macfarlane, (1971) J. Chem. Phys., 54, p. 5197Mikenda, Preisinger, (1981) J. Luminescence, 26, p. 53Mikenda, Preisinger, (1981) J. Luminescence, 26, p. 67Hill, Craig, Gibbs, (1979) Phys. Chem. Minerals, 4, p. 317Weindenborner, Stemple, Okaya, Cation distribution and oxygen parameter in magnesium gallate, MgGa2O4 (1966) Acta Crystallographica, 20, p. 761Brown, Manganese-Activated Luminescence in the MgO-Al[sub 2]O[sub 3]-Ga[sub 2]O[sub 3] System (1967) Journal of The Electrochemical Society, 3, p. 245Hoffman, Brown, (1968) J. Inorg. Nucl. Chem., 30, p. 63Lima, Baesso, Arguello, da Silva, Vargas, Miranda, (1987) Phys. Rev. B, 36, p. 9812Baesso, Mansanares, da Silva, Vargas, Miranda, (1989) Phys. Rev. B, 40, p. 1880Filho, Leite, Miranda, Cella, Vargas, Photoacoustic investigation of iodine-doped polystyrene (1989) Journal of Applied Physics, 66, p. 97Abritta, Cella, Vargas, (1989) Chem. Phys. Letters, 161, p. 12Da Fonseca, Abritta, (1993) Physica B, 190, p. 32

Photoluminescence and optical absorption of Cs2NaScF6 Cr3

The main objective of this paper is the characterization of the spectroscopic properties of new materials that are prospective laser media. This approach allows for the comparison of the properties of the Cr3 in different environments. Here, we have studied the photoluminescence and optical absorption of Cs2NaScF6 Cr3 single crystals. On the basis of near infrared luminescence measurements at 2, 77, and 300 K the observed lines originated from the Cr3 centres were associated with the 4T2 4F amp; 8594; 4A2 4F transition and the lifetimes were obtained. In spite of the quenching observed as a function of temperature at least 10 of the 2 K emission intensity for Cs2NaScF6 doped with 1 of Cr3 remains at room temperature. Besides, the 2 K emission broad band could be well described in terms of normal modes of the octahedral complex [CrF6]3 amp; 8722;, and the Racah and crystal field parameters calculate

Photoluminescence And Optical Absorption Of Cs2nascf 6:cr3+

The main objective of this paper is the characterization of the spectroscopic properties of new materials that are prospective laser media. This approach allows for the comparison of the properties of the Cr3+ in different environments. Here, we have studied the photoluminescence and optical absorption of Cs2NaScF6:Cr3+ single crystals. On the basis of near-infrared luminescence measurements at 2, 77, and 300 K the observed lines originated from the Cr3+-centres were associated with the 4T2 (44 F)→ 4A2 ( 4F) transition and the lifetimes were obtained. In spite of the quenching observed as a function of temperature at least 10% of the 2 K emission intensity for Cs2NaScF6 doped with 1% of Cr3+ remains at room temperature. Besides, the 2 K emission broad band could be well described in terms of normal modes of the octahedral complex [CrF 6]3-, and the Racah and crystal-field parameters calculated. © 2006 Springer Science+Business Media, Inc.163317323Kück, S., (2001) Appl. Phys. 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