Центральная Научная Библиотека УрО РАН

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   L 96


    Luminescence in Ln2CaGe4O12 under infrared laser excitation [Text] / V. G. Zubkov, I. I. Leonidov, N. V. Tarakina, O. V. Koryakova // Journal of Luminescence. - 2009. - Vol. 129, № 12. - P1625-1628

ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: Luminescent properties of the new group of crystalline optical materials Ln2CaGe4O12, Ln=Dy, Ho, Er, Tm, Yb were studied under laser excitation at ?=976 nm in the stationary mode. Er2CaGe4O12, Ho2CaGe4O12 and also the solid solution LnxY2-xCaGe4O12 (0?x?2) may be used in photonics as optical elements, such as converters and resonance amplifiers????

\\\\Expert2\\nbo\\Journal of Luminescence\\2009, v. 129, p.1625.pdf
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   U 67


    Upconversion luminescence in Er3+/Yb3+ codoped Y2CaGe4O12 [Electronic resource] / I. I. Leonidov, V. G. Zubkov, A. P. Tyutyunnik, N. V. Tarakina, L. L. Surat, O. V. Koryakova, E. G. Vovkotrub // Journal of Alloys and Compounds. - 2011. - Vol. 509, № 5. - P1339-1346. - Bibliogr. : p. 1345-1346 (52 ref.)

ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: Calcium yttrium tetrametagermanates Y2CaGe4O12 doped with Er3+ and Er3+/Yb3+ reveal upconversion emission in visible spectral range under near-infrared excitation, ex = 980 nm. For the solid solution ErxY2?xCaGe4O12 concentration dependencies for the green and red lines of the visible emission around 526 nm (2H11/2 4I15/2), 545 nm (4S3/2 4I15/2) and 670 nm (4F9/2 4I15/2) show the optimal value for the sample x = 0.2. The power dependence of the visible luminescence measured at room temperature in the low-power limit indicates two-photon upconversion process. Direct intensification of the upconversion emission signals has been achieved by ytterbium sensitizing. The other upconversion excitation mechanism in Y2CaGe4O12:Er3+ is discussed for an 808 nm incident laser irradiation. A scheme of excitation and emission routes involving ground/excited state absorption, energy transfer upconversion, nonradiative multiphonon relaxation processes in trivalent lanthanide ions in Y2CaGe4O12:Er3+ and Y2CaGe4O12:Er3+, Yb3+ has been proposed. Conditions for visible emission occurrence under quasi-resonance ex = 1064 nm excitation depending on pump power values are considered. In the low-power regime only near-infrared emission caused by the transition 4I13/2 4I15/2 in erbium ions has been detected

\\\\Expert2\\nbo\\Journal of Alloys and Compounds\\2011, v.509, N 5, p.1339.pdf
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