(La0.95Eu0.05)F3 Nanocrystal Synthesized by Sacrificial Template Method and Down-Conversion Luminescence Properties

Abstract

Abstract: (La_0.95Eu_0.05)F₃ nanocrystals were successfully prepared from a novel (La_0.95Eu_0.05)₂(OH)₄SO₄·2H₂O template via sacrificial template method, and the down conversion photoluminescence were investigated. The phase and luminescence properties of the synthetic products were characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), field emission scanning electron microscopy (FE-SEM), and photoluminescence (PL) spectroscopy. XRD and Rietveld refinement result indicate that (La_0.95Eu_0.05)₂(OH)₄SO₄·2H₂O template can be obtained using rare earth nitrate and ammonium sulfate as raw materials via hydrothermal reaction at 100 ℃, pH=9.5 for 24 h. The (La_0.95Eu_0.05)F₃ nanocrystals can be successfully synthesized by sacrificial reaction at 180 ℃ for 24 h when the molar ratio of RE³⁺ and F^- is 1∶3 or 1∶5. Photoluminescence analysis show that under 395 nm ultraviolet excitation, the (La_0.95Eu_0.05)F₃ phosphor show down-conversion emission at 591 nm (⁵D₀→ ⁷F₁ transition, strong), 618 nm (⁵D₀→ ⁷F₂ transition, medium strong) and 692 nm(⁵D₀→ ⁷F₄ transition, weak), with color coordinates of around (0.52, 0.45), orange-red light. The strongest emission is found to decay in a single exponential manner and have fluorescence lifetime of 14 ms.

Key words: sacrificial template, layered rare earth hydroxide, (La_0.95Eu_0.05)F₃, down-conversion luminescence, nanocrystal

CLC Number:

O734

ZHAO Xinrui, LI Longjiao, GONG Changshuai, WANG Chuqi, MA Teng, WANG Xuejiao. (La_0.95Eu_0.05)F₃ Nanocrystal Synthesized by Sacrificial Template Method and Down-Conversion Luminescence Properties[J]. Journal of Synthetic Crystals, 2021, 50(1): 53-59.

References

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(La_0.95Eu_0.05)F₃ Nanocrystal Synthesized by Sacrificial Template Method and Down-Conversion Luminescence Properties

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