Magnetic and Electronic Properties of Highly Mn-Doped beta-NaGdF4 and beta-NaEuF4 Nanoparticles with a Narrow Size Distribution
Autor(en): | Schneider, Lilli Wehmeier, Jannis Wiedwald, Ulf Rodewald, Jari Galakhov, Vadim R. Udintseva, Margarita S. Mesilov, Vitaly Radu, Florin Luo, Chen Klare, Johann P. Steinhoff, Heinz-Jurgen Haase, Markus Kuepper, Karsten |
Stichwörter: | ABSORPTION; Chemistry; Chemistry, Physical; COULOMB INTERACTION; EFFICIENCY; EMISSION; FLUORESCENT; Materials Science; Materials Science, Multidisciplinary; NANOCRYSTALS; Nanoscience & Nanotechnology; NAYF4; Science & Technology - Other Topics; SPECTROSCOPY; SPIN SUM-RULE; UP-CONVERSION LUMINESCENCE | Erscheinungsdatum: | 2020 | Herausgeber: | AMER CHEMICAL SOC | Journal: | JOURNAL OF PHYSICAL CHEMISTRY C | Volumen: | 124 | Ausgabe: | 33 | Startseite: | 18194 | Seitenende: | 18202 | Zusammenfassung: | We have performed a detailed study of the magnetic and electronic properties of highly manganese-doped beta-NaGdF4 and beta-NaGdF4 nanoparticles with a narrow size distribution. XPS as well as XRF experiments confirm the successful doping of 11 /- 2% Mn into beta-NaGdF4 and beta-NaGdF4 nanoparticles, i.e., a much higher Mn concentration than has been previously reported for the incorporation of bivalent transition metal ions into the beta phase of NaREF4 (RE = rare earth) nanocrystals. Owing to the high manganese concentration, we observed quenching of the Mn2+ emission in both materials and even quenching of the red Eu3+ emission in beta-NaGdF4 :11% Mn particles. We have investigated the Mn-Mn magnetic interactions by means of EPR spectroscopy, and SQUID magnetometry further supports a significant increase of the magnetization of the Mn-doped beta-NaGdF4 nanoparticles compared to pure beta-NaGdF4. By using element specific X-ray absorption spectroscopy and X-ray magnetic circular dichroism, we show that the magnetism of Mn-doped beta-NaGdF4 is dominated by the divalent Mn ions for Mn-doped beta-NaGdF4. A parallel alignment of the gadolinium and manganese magnetic moments is found. |
ISSN: | 19327447 | DOI: | 10.1021/acs.jpcc.0c04639 |
Zur Langanzeige
Seitenaufrufe
2
Letzte Woche
0
0
Letzter Monat
1
1
geprüft am 12.05.2024