Abstract
Spectrally resolved cathodo-thermoluminescence spectra of rare earth (RE) doped LiNaSO4 measured from 20 to 673 K reveal several anomalies in the RE emission lines and intensities. The low (20-300 K) temperature data show a discontinuous change in intensity at similar to 170 K that is either a marked intensity enhancement or a drop truncating the entire spectrum. Such an effect on the host luminescence has previously been assigned to a transition between cubic and hexagonal polymorphs of ice nanoparticle inclusions. Similar, but less profound anomalies are seen above room temperature (300-673 K) where the changes take the form of either a discontinuity in intensity at similar to 480 K or reduced intensity in the range 430-530 K. There are changes in the relative intensities of different emission lines of the same dopant in this temperature range. Such high temperature variations are ascribed to structural phase changes within the LiNaSO4 crystals. The behaviours may result from Li-poor surfaces or twin boundaries behaving like Na2SO4. This phase change is suggested in the open literature for LiNaSO4 but not yet fully documented, perhaps because the effects span a wide range of temperatures or due to experimental features inherent in most luminescence facilities.
Original language | English |
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Pages (from-to) | 455207 |
Number of pages | 6 |
Journal | Journal of Physics: Condensed Matter |
Volume | 20 |
Issue number | 45 |
DOIs | |
Publication status | Published - 12 Nov 2008 |
Keywords
- RARE-EARTHS
- LUMINESCENCE
- CATHODOLUMINESCENCE
- CASO4
- PHOSPHOR
- RAMAN
- DY