title: Persistent Luminescence of Tenebrescent Na8Al6Si6O24(Cl,S)2: Multifunctional Optical Markers.
abstract: Na8Al6Si6O24(Cl,S)2 materials were prepared with a solid state reaction. The products were studied using X-ray powder diffraction, reflectance measurements as well as X-ray fluorescence, conventional and persistent luminescence, nuclear magnetic resonance, and electron paramagnetic resonance spectroscopies. All materials containing sulfur showed purple tenebrescence, which persisted 2 days in a lit room at room temperature. Considerable blue persistent luminescence peaking at 460 nm and lasting for 1 h was obtained, as well. Persistent luminescence was obtained with irradiation at 365 nm, while tenebrescence required 254 nm. The materials show great promise as low-cost multifunctional optical markers.
authors.affiliation: †Department of Chemistry, University of Turku, FI-20014 Turku, Finland.
authors.forename: Isabella
authors.initials: I
authors.lastname: Norrbo
authors.affiliation: ‡Institute of Low Temperature and Structure Research Polish Academy of Sciences, PL-50422 Wroclaw, Poland.
authors.forename: Pawel
authors.initials: P
authors.lastname: Gluchowski
authors.affiliation: §Department of Physics and Astronomy, Wihuri Physical Laboratory, University of Turku, FI-20014 Turku, Finland.
authors.forename: Petriina
authors.initials: P
authors.lastname: Paturi
authors.affiliation: †Department of Chemistry, University of Turku, FI-20014 Turku, Finland.
authors.forename: Jari
authors.initials: J
authors.lastname: Sinkkonen
authors.affiliation: †Department of Chemistry, University of Turku, FI-20014 Turku, Finland.|¶Turku Centre for Materials and Surfaces (MatSurf), FI-20014 Turku, Finland.
authors.forename: Mika
authors.initials: M
authors.lastname: Lastusaari