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Energy Transfer between Tb3+ and Eu3+ in LaPO4: Pulsed versus Switched-off Continuous Wave Excitation.

ABSTRACT: The energy transfer (ET) between Tb3+ and Eu3+ is investigated experimentally and with available theoretical models in the regime of high Tb3+ concentrations in ≈30 nm LaPO4 nanoparticles at room temperature. The ET efficiency approaches 100% even for lightly Eu3+-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 Tb3+ ions, situated on La3+ sites with ≈4 Å separation, is not fast. The quenching of Tb3+ emission in singly doped LaPO4 only reduces the luminescence lifetime by ≈50% in heavily doped samples. Various theoretical models are applied to simulate the luminescence decays of Tb3+ and Tb3+, Eu3+-doped LaPO4 samples of various concentrations and the transfer mechanism is identified as forced electric dipole at each ion.

SUBMITTER: Luo Y 

PROVIDER: S-EPMC6524098 | biostudies-literature | 2019 May

REPOSITORIES: biostudies-literature

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Energy Transfer between Tb<sup>3+</sup> and Eu<sup>3+</sup> in LaPO<sub>4</sub>: Pulsed versus Switched-off Continuous Wave Excitation.

Luo Yuxia Y   Liu Zhenyu Z   Wong Hon Tung HT   Zhou Lei L   Wong Ka-Leung KL   Shiu Kwok Keung KK   Tanner Peter A PA  

Advanced science (Weinheim, Baden-Wurttemberg, Germany) 20190405 10

The energy transfer (ET) between Tb<sup>3+</sup> and Eu<sup>3+</sup> is investigated experimentally and with available theoretical models in the regime of high Tb<sup>3+</sup> concentrations in ≈30 nm LaPO<sub>4</sub> nanoparticles at room temperature. The ET efficiency approaches 100% even for lightly Eu<sup>3+</sup>-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<sup>3+  ...[more]

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