Thermal behaviour and photoluminescence properties of Er- and Nd-doped yttrium aluminate glasses
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Thermal behaviour and photoluminescence properties of Er‑ and Nd‑doped yttrium aluminate glasses Anna Prnová1,2 · Jana Valúchová1,2 · Nurshen Mutlu2 · Milan Parchovianský2 · Róbert Klement2 · Alfonz Plško2 · Dušan Galusek1,2 Received: 9 August 2019 / Accepted: 9 May 2020 © Akadémiai Kiadó, Budapest, Hungary 2020
Abstract Yttrium aluminate glasses (76.8 mol% of Al2O3, 23.2 mol% of Y2O3) doped with Er3+ and Nd3+ ions at different concentration levels (0.25 mol%, 0.5 mol% and 0.75 mol% Er2O3/Nd2O3) were prepared by flame synthesis in the form of glass microspheres. The prepared samples were XRD amorphous, without presence of any crystalline phases in measured patterns. The two exothermic effects (~ 940, ~ 1010 °C), which can be assigned to the two steps of YAG crystallization, were observed in the DSC records of all prepared samples. The high temperature XRD measurements showed YAG (900–1200 °C) and α-Al2O3 (1300–1450 °C) phase crystallization. The emission spectra were measured in the VIS and NIR regions for Er-doped samples and in the NIR region for Nd-doped samples. All measured emission spectra contain of characteristic bands due to the typical 4f–4f transitions within the E r3+ and N d3+ ions. Comparison of the measured intensities of Er-doped samples made it evident that the highest intensities were obtained for the 0.5 mol% Er2O3-doped sample (in both the NIR and VIS spectral regions). The maximum intensity for Nd-doped samples was found when the sample was doped with 0.75 mol% of N d 2O 3. The slowly increasing of emission intensities in samples after 20 min annealing at 1000 °C and Stark splitting of emission bands in samples after 40 and 60 min annealing at 1000 °C and after 20, 40 and 60 min annealing at 1500 °C was observed. Keywords Thermal behaviour · Photoluminescence properties · Aluminate glasses
Introduction Yttrium aluminium garnet (YAG, Y 3Al5O12) is routinely used in various applications as a structural and engineering material. YAG shows a high chemical stability, low electrical conductivity as well as a high resistance to creep [1]. Polycrystalline, transparent, YAG ceramics, doped with rare earth ions, have been widely studied over the past two decades since their first demonstration as a laser material in 1995. Transparent YAG ceramics have been considered to have significant potential as a gain media for a high-power and high efficiency solid state laser due to their favourable characteristics, relative to single crystal, including an * Anna Prnová [email protected] 1
Vitrum Laugaricio Join Glass Centre of the IIC SAS, TnUAD, FChPT STU, Študentská 2, 911 50 Trenčín, Slovakia
FunGlass, A. Dubček University of Trenčín, Študentská 2, 911 50 Trenčín, Slovakia
2
increased maximum dopant concentration, more functional design freedom, easier manufacturing, a lower cost, and more importantly, unique optical and thermal properties [2]. For instance, YAG doped with rare earth (RE) elements, such as Er or Nd, are important and promising solid-state laser materials with po
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