Photochromic Sodalites by a New Method of Synthesis
1.52 MB
avoin
Julkaisu on tekijänoikeussäännösten alainen. Teosta voi lukea ja tulostaa henkilökohtaista käyttöä varten. Käyttö kaupallisiin tarkoituksiin on kielletty.
Lataukset782
Pysyvä osoite
Verkkojulkaisu
DOI
Tiivistelmä
Photochromic sodalites, also known as hackmanites, are minerals that belong to the sodalite mineral group and have a general formula of Na8(SiAlO4)6(Cl,S)2. Hackmanites can exhibit reversible photochromism i.e., tenebrescence, photoluminescence and persistent luminescence upon UV irradiation. In tenebrescence, hackmanite changes colour, traditionally from white to purple corresponding to a formation of an F-centre which absorbs light of around 540 nm, after UV or X-ray irradiation. The tenebrescence colour can be bleached with either heat or visible light.
Synthesized hackmanites show various luminescence and tenebrescence properties, and, for the first time, yellow and near-infrared tenebrescence are reported for hackmanites. Hackmanites with these exciting new properties could potentially be used as materials for different applications, including advanced anti-counterfeiting.