Photoluminescence and radioluminescence study of NaMgF3:Eu nanoparticles |
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| Institution: | 1. Department of Chemistry of the University of Fribourg, Chemin du Musée 9, 1700 Fribourg, Switzerland;2. Institute of Physical Chemistry, Spaiul Independentei 202, Bucharest 060021, Romania;3. Inorganic Chemistry, Faculty of Science and Engineering, University of Siegen, Adolf-Reichwein-Straße, 57068 Siegen, Germany;1. School of Physical Science and Information Technology, LiaochengUniversity, Liaocheng 252059, China;2. Shandong Provinical Key Laboratory of Optical Communication Science and Technology, Liaocheng 252059, China;1. Centre for Crystal Growth, SSN College of Engineering, Kalavakkam, Tamilnadu-603 110, India;2. Radiological Safety Division, Indira Gandhi Centre for Atomic Research, Kalpakkam, Tamilnadu-603 102, India |
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| Abstract: | Photoluminescence (PL) and radioluminescence (RL) measurements were made on small (∼25 nm) NaMgF3 nanoparticles doped with Eu concentrations ranging from 0.1% to 5%. We find that they contained Eu3+, Eu2+, and an additional unidentified defect with a broad PL emission ∼470 nm. Similar to previous measurements on larger (57 nm–77 nm) NaMgF3:Eu nanoparticles with 1% Eu and 5% Eu, we find that the PL lifetime decreases with increasing Eu concentration that can be attributed to Eu energy transfer to non-radiative recombination sites. However, there is no change in the fraction of Eu3+ distorted sites. The ∼470 nm PL defect peak was also reported for larger nanoparticles, which suggests that this peak arises from similar unidentified point defects. However, the activated non-radiative decay for the small nanoparticles has a significantly lower activation energy. The Eu3+ RL decreases by only 2.3% at 10 kGy for low Eu concentrations. |
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| Keywords: | Nanoparticles Fluoroperovskites Photoluminescence Radioluminescence |
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