(La0.95Eu0.05)F3纳米晶的自牺牲模板法合成及其下转换发光性能研究

摘要/Abstract

摘要： 利用自牺牲模板法以一种新型稀土层状化合物(La_0.95Eu_0.05)₂(OH)₄SO₄·2H₂O为模板成功合成出(La_0.95Eu_0.05)F₃纳米晶并研究其下转换发光性能。采用X射线衍射仪(XRD)、傅里叶红外变换(FT-IR)、场发射扫描电子显微镜(FE-SEM)及荧光光谱仪对合成产物的物相和荧光性能进行表征。XRD及Rietveld精修结果表明以稀土硝酸盐和硫酸铵为原料在100 ℃、pH值为9.5的条件下反应24 h可得到稀土层状化合物(La_0.95Eu_0.05)₂(OH)₄SO₄·2H₂O模板。自牺牲反应过程中,当模板中稀土离子与氟化铵中氟离子摩尔比为1∶3和1∶5时,在180 ℃下水热反应24 h可成功合成(La_0.95Eu_0.05)F₃纳米晶。荧光光谱分析表明,(La_0.95Eu_0.05)F₃荧光粉在395 nm的紫外光激发下,分别在591 nm(⁵D₀→⁷F₁跃迁,高强度)、618 nm(⁵D₀→ ⁷F₂跃迁,中等强度)和692 nm(⁵D₀→ ⁷F₄跃迁,低强度)处显示下转换发射。所得荧光粉的色坐标为(0.52,0.45),橙红光。荧光粉的主发射峰呈现单指数衰减行为,拟合后发现其荧光寿命约为14 ms。

关键词: 自牺牲模板法, 稀土层状化合物, (La_0.95Eu_0.05)F₃, 下转换发光, 纳米晶

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

中图分类号:

O734

赵昕睿, 李龙娇, 龚长帅, 王楚祺, 马藤, 王雪娇. (La_0.95Eu_0.05)F₃纳米晶的自牺牲模板法合成及其下转换发光性能研究[J]. 人工晶体学报, 2021, 50(1): 53-59.

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.

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(La_0.95Eu_0.05)F₃纳米晶的自牺牲模板法合成及其下转换发光性能研究

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

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