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Investigation of Er doped zinc borate glasses by low-temperature photoluminescence
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SYSNO ASEP 0480688 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Investigation of Er doped zinc borate glasses by low-temperature photoluminescence Author(s) Kostka, Petr (USMH-B) RID, ORCID, SAI
Kabalci, I. (TR)
Tay, T. (TR)
Gladkov, Petar (URE-Y)
Zavadil, Jiří (USMH-B)Source Title Journal of Luminescence. - : Elsevier - ISSN 0022-2313
Roč. 192, DEC 2017 (2017), s. 1104-1109Number of pages 6 s. Publication form Print - P Language eng - English Country NL - Netherlands Keywords borate glasses ; rare-earth ions ; stark levels ; photoluminiscence Subject RIV JH - Ceramics, Fire-Resistant Materials and Glass OECD category Ceramics Subject RIV - cooperation Institute of Radio Engineering and Electronics - Ceramics, Fire-Resistant Materials and Glass Institutional support USMH-B - RVO:67985891 ; URE-Y - RVO:67985882 UT WOS 000413037400158 EID SCOPUS 85021391401 DOI 10.1016/j.jlumin.2017.06.010 Annotation Er3+ doped (95-x)B2O3-xZnO-5TiO2 (x =45, 50 and 55 mol%) bulk glasses were prepared by conventional melt quenching method and investigated by transmission and photoluminescence (PL) spectroscopy. Transmission spectra exhibit sharp absorption bands at 364, 377, 406, 441, 448, 488, 521, 541, 651, 792, 974, and 1530 nm, that correspond to absorption on Er3+ ions and they are attributed to the optical transitions from the ground state 4I15/2 to the excited states 4G9/2, 4G11/2,4F9/2, 4F3/2, 4F5/2, 4F7/2, 2H11/2, 4S3/2, 4F9/2, 4I9/2, 4I11/2 and 4I13/2, respectively. The optical gap has been estimated around 3.5 eV with a tendency to increase with increasing ZnO content. Low-temperature PL properties of the Er3+ doped glasses and of the host glass itself were investigated. To achieve this goal, two different wavelengths (325 and 514.5 nm) were used for PL excitation. PL spectra excited by He-Cd laser at 325 nm were dominated by the host glass broad-band luminescence centred at around 570 nm. Simultaneously we observed narrow emission and absorption features due to 4f-4f electronic transitions in Er3+ ions superposed on the broad band host glass luminescence. We argue that these superposed narrow absorption dips represent a direct evidence of the energy transfer from the electronic structure of the host to 4f states of Er3+ ions. Fine structure of Er3+ emission bands at 980 and 1530 nm, corresponding to radiative transitions from the two lowest excited states of Er3+ ions to the ground state manifold have been investigated at room temperature and at 4 K, and a schematic energy diagram of Stark levels of 4I11/2, 4I13/2 and 4I15/2 manifolds has been deduced. Workplace Institute of Rock Structure and Mechanics Contact Iva Švihálková, svihalkova@irsm.cas.cz, Tel.: 266 009 216 Year of Publishing 2018
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