Lanthanide and Heavy Metal Free Long White Persistent Luminescence from Ti Doped Li–Hackmanite: A Versatile,Low‐Cost Material |
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Authors: | Isabella Norrbo José M Carvalho Pekka Laukkanen Jaakko Mäkelä Fikret Mamedov Markus Peurla Hanna Helminen Sari Pihlasalo Harri Härmä Jari Sinkkonen Mika Lastusaari |
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Institution: | 1. Department of Chemistry, University of Turku, Turku, Finland;2. Doctoral Programme in Physical and Chemical Sciences (PCS), University of Turku Graduate School (UTUGS), Turku, Finland;3. Institute of Chemistry, University of S?o Paulo, S?o Paulo, Brazil;4. Department of Physics and Astronomy, University of Turku, Turku, Finland;5. Molecular Biomimetics, Department of Chemistry, Uppsala University, Uppsala, Sweden;6. Laboratory of Electron Microscopy, University of Turku, Turku, Finland;7. Turku University Centre for Materials and Surfaces (MatSurf), Turku, Finland |
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Abstract: | Persistent luminescence (PeL) materials are used in everyday glow‐in‐the‐dark applications and they show high potential for, e.g., medical imaging, night‐vision surveillance, and enhancement of solar cells. However, the best performing materials contain rare earths and/or other heavy metal and expensive elements such as Ga and Ge, increasing the production costs. Here, (Li,Na)8Al6Si6O24(Cl,S)2:Ti, a heavy‐metal‐ and rare‐earth‐free low‐cost material is presented. It can give white PeL that stays 7 h above the 0.3 mcd m?2 limit and is observable for more than 100 h with a spectrometer. This is a record‐long duration for white PeL and visible PeL without rare earths. The material has great potential to be applied in white light emitting devices (LEDs) combined with self‐sustained night vision using only a single phosphor. The material also exhibits PeL in aqueous suspensions and is capable of showing easily detectable photoluminescence even in nanomolar concentrations, indicating potential for use as a diagnostic marker. Because it is excitable with sunlight, this material is expected to additionally be well‐suited for outdoor applications. |
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Keywords: | detection hackmanites lighting persistent luminescence tenebrescence |
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