Abstract
The energy transfer (ET) between Tb 3+ and Eu 3+ is investigated experimentally and with available theoretical models in the regime of high Tb 3+ concentrations in ≈30 nm LaPO 4 nanoparticles at room temperature. The ET efficiency approaches 100% even for lightly Eu 3+ -doped materials. The major conclusion from the use of pulsed laser excitation and switched-off continuous wave laser diode excitation is that the energy migration between Tb 3+ ions, situated on La 3+ sites with ≈4 Å separation, is not fast. The quenching of Tb 3+ emission in singly doped LaPO 4 only reduces the luminescence lifetime by ≈50% in heavily doped samples. Various theoretical models are applied to simulate the luminescence decays of Tb 3+ and Tb 3+ , Eu 3+ -doped LaPO 4 samples of various concentrations and the transfer mechanism is identified as forced electric dipole at each ion.
Original language | English |
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Article number | 1900487 |
Journal | Advanced Science |
Volume | 6 |
Issue number | 10 |
DOIs | |
Publication status | Published - 17 May 2019 |
Scopus Subject Areas
- Medicine (miscellaneous)
- General Chemical Engineering
- Biochemistry, Genetics and Molecular Biology (miscellaneous)
- General Materials Science
- General Engineering
- General Physics and Astronomy
User-Defined Keywords
- energy transfer
- lanthanide
- migration
- pulse and continuous wave excitation