Luminescent properties and phase transition in Er3+-Yb3-co-doped NaYF4/SiO2 core-shell nanoparticles

Xiaojie Xue; Tonglei Cheng; Weiqing Gao; Takenobu Suzuki; Yasutake Ohishi

doi:10.1117/12.2251737

16 February 2017 Luminescent properties and phase transition in Er³⁺-Yb₃₊-co-doped NaYF₄/SiO₂ core-shell nanoparticles

Xiaojie Xue, Tonglei Cheng, Weiqing Gao, Takenobu Suzuki, Yasutake Ohishi

Proceedings Volume 10100, Optical Components and Materials XIV; 101001Y (2017) https://doi.org/10.1117/12.2251737
Event: SPIE OPTO, 2017, San Francisco, California, United States

Abstract

We successfully synthesized Er³⁺-Yb³⁺ doped cubic phase NaYF₄ nanocrystals by a facile solvethermal method. The average size of the as-prepared nanocrystals was about 12 nm based on the observation of scanning electron microscope and transmission electron microscope. NaYF₄/SiO₂ nanoparticles were prepared. The thickness of shell layer was about 7 nm. The as-prepared samples were annealed at different temperature. The cubic phase NaYF₄ did not transit to hexagonal phase, but to amorphous phase as the annealing temperature increased to 700 °C. When temperature further increased to 1100 °C, the amorphous NaYF₄ reacted with SiO₂ shell and formed a new phase, NaYSiO₄. Under the excitation by a 976 nm laser, the Er³⁺-Yb³⁺ doped NaYF₄, NaYF₄/SiO₂, and NaYSiO₄ nanoparticles showed intense visible upconversion emissions. Since the host materials changed from fluoride crystals to amorphous fluoride, then to silicate crystals, the spectral profiles were different. Fluorescent lifetimes obtained from decay curves were applied to analyze the multi-phonon relaxation processes in different hosts. The Er³⁺-doped upconversion phosphors will be useful for light converting in solar cell applications in the future.

Citation Download Citation

Xiaojie Xue, Tonglei Cheng, Weiqing Gao, Takenobu Suzuki, and Yasutake Ohishi "Luminescent properties and phase transition in Er³⁺-Yb₃₊-co-doped NaYF₄/SiO₂ core-shell nanoparticles", Proc. SPIE 10100, Optical Components and Materials XIV, 101001Y (16 February 2017); https://doi.org/10.1117/12.2251737

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