荧光粉
材料科学
发光
光致发光
镧系元素
兴奋剂
白光
金属
水溶液
检出限
纳米技术
光电子学
冶金
物理化学
化学
有机化学
色谱法
离子
作者
Isabella Norrbo,José Miranda de Carvalho,P. Laukkanen,Jarno Mäkelä,Fikret Mamedov,Markus Peurla,Hanna Helminen,Sari Pihlasalo,Harri Härmä,Jari Sinkkonen,Mika Lastusaari
标识
DOI:10.1002/adfm.201606547
摘要
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) 8 Al 6 Si 6 O 24 (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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