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Glowing synthetic chlorohectorite: The luminescent features of a trioctahedral clay mineral.
- Source :
-
Journal of Luminescence . Dec2017, Vol. 192, p567-573. 7p. - Publication Year :
- 2017
-
Abstract
- Clay minerals are versatile materials with numerous industrial applications. Their unique layered structure can act as a host for many optically active species. The synthesis and luminescence properties of chlorohectorite clays are now reported for the first time. The synthesized clays are composed of quasi-circular nanoparticles with diameters around 20–30 nm showing blue/green emission and persistent luminescence with a duration of ca. 5 s. The luminescence features are associated with titanium impurities in the chlorohectorite structure. It is shown that Ti can act as activator ion even at low concentrations: the XRF and ICP-MS measurements of the chlorohectorite materials indicate a Ti concentration around 60 ppm originating from the precursors. The XPS measurements of the clay materials showed the Ti 2p 3/2 signals at 457.8 and 458.9 eV associated with Ti 3+ and Ti IV , respectively. The excitation spectra confirm Ti 3+ as the luminescent center in the chlorohectorites through the bands at 287 and 370 nm, related to the e − ( O 2 − ( 2 p ) ) → Ti IV charge transfer and the electronic transitions from the t 2g to e g levels of Ti 3+ , respectively. The persistent luminescence properties are due to structural defects common for layered silicates. [ABSTRACT FROM AUTHOR]
- Subjects :
- *CLAY minerals
*LUMINESCENCE
*NANOPARTICLES
*ELECTRONIC excitation
TITANIUM isotopes
Subjects
Details
- Language :
- English
- ISSN :
- 00222313
- Volume :
- 192
- Database :
- Academic Search Index
- Journal :
- Journal of Luminescence
- Publication Type :
- Academic Journal
- Accession number :
- 125703914
- Full Text :
- https://doi.org/10.1016/j.jlumin.2017.07.017