| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 7906539 | Optical Materials | 2018 | 7 Pages |
Abstract
LiLa9(SiO4)6O2 (LLSO) crystals doped with Pr3+ ions were grown using the slow cooling flux method. The crystals were characterized by means of luminescence and optical spectroscopy and luminescence decay measurements upon excitation in UV, VUV and X-ray range including using synchrotron radiation sources. The spectroscopic data revealed the presence Pr3+ 5dâ4f emission and excitation bands related to Pr3+ ions replacing La3+ in two nonequivalent positions, and features related Pr3+ 4fâ4f emission. The photon cascade emission is not observed in LLSO:Pr3+, since Pr3+1S0 state is above the bottom of 4fn-15d mixed-states band. Apart from the emission features related to Pr3+, a defect-related emission was observed upon UV, VUV, and ionizing radiation excitation. Presence of the defects was shown with thermoluminescence measurements and suggested to be the main reason for suppression the 5dâ4f emission. Peculiarities of host-to-impurity energy transfer are analyzed and discussed.
Keywords
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Physical Sciences and Engineering
Materials Science
Ceramics and Composites
Authors
Konstantin V. Ivanovskikh, Qiufeng Shi, Marco Bettinelli, Vladimir A. Pustovarov,