Tailored white light emission in Eu3+/Dy3+ doped tellurite glass phosphors containing Al3+ ions

Michalina Walas , Patryk Piotrowski , Tomasz Lewandowski , Anna Synak , Marcin Łapiński , Wojciech Sadowski , Barbara Kościelska

Abstract

Tellurite glass systems modified by addition of aluminum fluoride AIF(3) have been successfully synthesized as host matrices for optically active rare earth ions RE3+ (RE3+ = Eu3+, Dy3+). Samples with different Eu3+ to Dy3+ molar ratio have been studied in order to determine possibility of white light emission via UV excitation. Structural investigations confirmed amorphous character of materials whereas spectroscopic studies brought more insight into glass network's nature. FTIR results shown presence of two features related to tellurite glass matrix (in 490-935 cm(-1) spectral region) and another one (940-1250 cm(-1)) due to aluminum addition. Especially, Al-O and Te-O-Al bonds of AlO4 tetrahedrons have been found. AlO4 units are considered as glass formers that improve network's strength and thermal resistivity against devitrification. Based on XPS studies of Al3+ photoelectron band the existence of Al-O and also Al-F bonds have been examined. Moreover, signals originating from Eu3+ and Dy3+ have been found confirming their valence state. Luminescence results revealed possibility of simultaneous UV excitation of Eu3+ and Dy3+ ions. Excitation with lambda(exc) = 390 and 393 nm resulted in white light generation starting from warm white to neutral and cool white depending on Eu3+ concentration and used excitation wavelength. Additionally, increase of decay lifetime of Eu3+ induced by Al3+ presence have been revealed based on luminescence decay analysis. Thus, tellurite glass systems modified by AlE3 and doped with Eu3+/Dy3+ may be considered as promising candidates for white light emitting sources.
Author Michalina Walas
Michalina Walas,,
-
, Patryk Piotrowski
Patryk Piotrowski,,
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, Tomasz Lewandowski
Tomasz Lewandowski,,
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, Anna Synak (FMPI / IEP)
Anna Synak,,
- Institute of Experimental Physics
, Marcin Łapiński
Marcin Łapiński,,
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, Wojciech Sadowski
Wojciech Sadowski,,
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, Barbara Kościelska
Barbara Kościelska,,
-
Journal seriesOptical Materials, ISSN 0925-3467, e-ISSN 1873-1252, (A 30 pkt)
Issue year2018
Vol79
Pages289-295
Publication size in sheets0.5
Keywords in EnglishEU, Dy, luminescence, WLED, tellurite glass, Al3+
DOIDOI:10.1016/j.optmat.2018.03.015
URL https://doi.org/10.1016/j.optmat.2018.03.015
Languageen angielski
Score (nominal)35
ScoreMinisterial score = 30.0, 26-10-2018, ArticleFromJournal
Ministerial score (2013-2016) = 35.0, 26-10-2018, ArticleFromJournal
Publication indicators WoS Impact Factor: 2016 = 2.238 (2) - 2016=2.209 (5)
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