Anomalous enhancement of radioluminescence in Lu2-xYxSiO5:Ce3+ and ZnxMg1-xWO4 mixed oxide nanocrystals
Abstract
We have observed an enhancement of radioluminescence intensity in mixed oxide nanocrystals with activator (Lu2-xYxSiO5:Ce3+ nanocrystals) and intrinsic luminescence (ZnxMg1-xWO4 nanocrystals) which value is higher as compared to the one observed for bulk scintillation crystals. This effect was explained as a result of both reduction of thermalization length of geminate electron-hole pairs and decrease of the content of electron traps formed by oxygen vacancies at cation mixing. More sufficient change of the content of oxygen vacancies at cation mixing for nanocrystals than for bulk crystals leads to stronger increase of radioluminescence intensity.
- Publication:
-
Optical Materials
- Pub Date:
- December 2019
- DOI:
- 10.1016/j.optmat.2019.109455
- Bibcode:
- 2019OptMa..9809455M
- Keywords:
-
- Scintillator;
- Cation mixing;
- Nanocrystals;
- Silicates;
- Tungstates