Up-conversion white emission and other luminescence properties of a YAG:Yb2O3·Tm2O3·Ho2O3@SiO2 glass-nanocomposite
Andrzej Marian Kłonkowski , Benedykt Kukliński , Mariusz Kubus , Jacek Ryl , Karol Szczodrowski , Dorota Wileńska , H.-Jürgen Meyer
AbstractWe report on a glass-nanocomposite material consisting of yttrium aluminum garnet (Y3Al5O12, YAG) nanocrystals codoped with Yb3+, Tm3+ and Ho3+ ions as well as entrapped into a SiO2 xerogel. This 94YAG$5Yb2O3$0.8Tm2O3$0.2Ho2O3@SiO2(abbr. YAG:YbTmHo@SiO2) nanocomposite material has been prepared by sol–gel procedure. Its structure and morphology has been characterized by means of X-ray diffraction (XRD) and scanning electron microscope (SEM) techniques as well as energy dispersive X-ray (EDX), X-ray photoelectron (XPS) and luminescence spectroscopies. The luminescent glass- nanocomposite exhibited an up-conversion effect under lexc¼ 980 nm and emission when excited under 355 nm in steady-state conditions. Then time-resolved luminescence emission was observed, when the sample was excited at 290 and 355 nm by a pulse laser. Average decay times for the SiO2 matrix and for some transitions of the Tm3+ and Ho3+ dopants present in the YAG:YbTmHo@SiO2 material have been evaluated. The luminescent nanocomposite when excited under 290 or 355 nm wavelengths in both conditions emits blue light. However, the nanocomposite is promising as a single-source white-light phosphor owing to its up-conversion luminescence under 980 nm excitation. Such optical features make the studied material an alternative phosphor.
|Journal series||RSC Advances, ISSN 2046-2069, (A 30 pkt)|
|Publication size in sheets||0.5|
|License||Journal (articles only); published final; ; with publication|
|Score|| = 30.0, ArticleFromJournal|
= 35.0, ArticleFromJournal
|Publication indicators||: 2017 = 2.936 (2) - 2017=3.096 (5)|
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