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A new mechanoluminescence phosphor Na3Sc2(PO4)3:Eu2+: Phase transition-assisted defect formation in a polymorphic composition |
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| Affiliation: | 1. LumiLab, Department of Solid State Sciences, Ghent University, Krijgslaan 281-S1, Gent 9000, Belgium;2. Center for Nano and Biophotonics (NB-Photonics), Ghent University, Gent 9000, Belgium;3. Mechanics of Materials and Structures (MMS), Department of Materials, Textiles and Chemical Engineering (MaTCh), Ghent University, Tech Lane Ghent Science Park-Campus Ardoyen 46, Zwijnaarde 9052, Belgium |
| Abstract: | A new mechanoluminescent phosphor was developed from a sodium (Na) superionic conductor (NASICON)-structured Na3Sc2(PO4)3:Eu2+ phosphor that is known for its self-healing properties. The compound that crystalized assuming monoclinic C2/c symmetry was found to be blue-emitting, with no noticeable persistent luminescence. Thermoluminescence analysis showed that the phosphor had two prominent distinct thermal emission bands corresponding to the high-temperature β- and γ-phases of the composition. The mechanoluminescence properties of the material that does not have any persistent luminescence at room temperature were investigated by imparting impulsive strain. The compound on charging with 365 nm radiation was found to have significant mechanoluminescent emission originating from shallow defects present in the β-phase of composition that formed by the stress-induced phase transition process. Its emission characteristics and temporal behavior were investigated by varying the impact velocity. |
| Keywords: | Photoluminescence Thermoluminescence Mechanoluminescence Rietveld refinement Phosphor Blue emission |
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