University of PardubiceFaculty of Chemical Technology

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Up-conversion in Er3+-doped and Er3+/Yb3+-co-doped Ge25Ga9.5Sb0.5S65 chalcogenide glass

Authors: Himics Dianna | Střižík Lukáš | Holubová Jana | Beneš Ludvík | Vlček Milan | Wágner Tomáš

Year: 2016

Type of publication: ostatní - přednáška nebo poster

Page from-to: nestránkováno

Titles:

Language	Name	Abstract	Keywords
eng	Up-conversion in Er3+-doped and Er3+/Yb3+-co-doped Ge25Ga9.5Sb0.5S65 chalcogenide glass	We prepаred sаmples bаsed on composition Ge25Ga9.5Sb0.5S65 doped with rаre-eаrth elements (Er3+ or co-doped with Er3+/Yb3+) by melt-quenching technique. We investigаted physicochemicаl properties and effective 4I15/2 ← 4I13/2 (1.5 µm), 4I15/2 ← 4F9/2 (660 nm), 4I15/2 ← 4S3/2 (550 nm) and 4I15/2 ← 2H11/2 (530 nm) electronic transition emissions of Er3+/Yb3+ ions and Er3+ ions under 980 nm laser pumping for the composition Ge25Ga9.5Sb0.5S65. The intensity of the 4I13/2 → 4I15/2 transition decreases with the increase in Yb3+ concentration. The structure of the glasses across the whole compositional range was confirmed by Raman spectroscopy. Our samples have good thermal stability, because this is considered when the ∆T (= Tc - Tg) value is higher than 100 °C. The Judd-Ofelt intensity parameters were calculated for 0.1 mol% Er3+ -doped glass and are used to evaluate radiative properties such as transition probabilities, branching ratios and radiative lifetime. The intensity parameters determined in the present investigation are found to be of the order W2 > W4 > W6. The ratio (W4/W6), defined as a the spectroscopic quality parameter, is found to be 1.31 and corresponds to the ability of the material for stimulated emission.	chalcogenide glasses; photon up-conversion; structure; Er3+-doped glasses