有机配体对NaBiF4:Yb3+/Er3+上转换纳米粒子形貌和发光性能的调控研究

doi:10.15541/jim20190236

摘要/Abstract

摘要：

本工作采用一锅溶剂热法分别制备了不同有机配体修饰的NaBiF₄:Yb³⁺/Er³⁺上转换纳米粒子(UCNPs), 并对其形貌和发光性能进行了研究。实验表明, 有机配体的软模板和导向作用可调控UCNPs的粒径和形貌, 且有机配体的缺陷钝化作用会使其发光增强。其中, 以十六烷基三甲基溴化铵(CTAB)和十六烷基三甲基氯化铵(CTAC)修饰的UCNPs的增强效果最为显著, 强度大约增加了9倍。此外, 本研究进一步考察了该UCNPs在不同的温度和pH条件下的发光强度的变化规律。结果表明, 在30~90 ℃之间, 其发光强度随着温度的升高而降低; 在强酸和强碱环境中, 其发光强度显著降低, 而在pH为5~6时, 其发光强度最大。

关键词: 上转换纳米粒子, NaBiF₄:Yb³⁺/Er³⁺, 有机配体

Abstract:

NaBiF₄:Yb³⁺/Er³⁺ upconversion materials modified by different organic ligands were synthesized by solvent thermal method, and then their morphology and luminescence properties were studied. The results show that the soft template and orientation of the organic ligands can tune the particle size and morphology of the UCNPs, and the defect passivation of the surface organic ligands enhances the luminescence intensity. Especially, the cetyl trimethylammonium bromide (CTAB) and the cetyl trimethylammonium chloride (CTAC) modified materials have the most significant enhancement effect (9 times). Furthermore, the effects of temperature and pH on luminescent properties of the materials were investigated. Results show that, within the range of experimental conditions, the luminescence intensity of the materials decreases with the increase of temperature from 30 to 90 ℃ and significantly reduces under strong acid and alkaline conditions, with maximum at pH 5-6.

Key words: upconversion nanoparticles, NaBiF₄:Yb³⁺/Er³⁺, organic ligand

中图分类号:

O482

邵康,汪涛,闻莹婷,滕渊洁,刘会君,潘再法. 有机配体对NaBiF₄:Yb³⁺/Er³⁺上转换纳米粒子形貌和发光性能的调控研究[J]. 无机材料学报, 2020, 35(4): 447-453.

SHAO Kang,WANG Tao,WEN Yingting,TENG Yuanjie,LIU Huijun,PAN Zaifa. Modulation of Morphology and Luminescence Property of NaBiF₄:Yb³⁺/Er³⁺ Upconversion Nanoparticles by Organic Ligands[J]. Journal of Inorganic Materials, 2020, 35(4): 447-453.

图/表 9

图1 (a)PAA-NaBiF4、(b)PEI-NaBiF4、(c)PVP-NaBiF4、(d)CTAB-NaBiF4、(e)CTAC-NaBiF4和(f)CA-NaBiF4的红外光谱图

Fig. 1 IR spectra of (a) PAA-modified NaBiF4, (b) PEI-modified NaBiF4, (c) PVP-modified NaBiF4, (d) CTAB-modified NaBiF4, (e) CTAC-modified NaBiF4, and (f) CA-modified NaBiF4

图2 几种样品的XRD谱图

Fig. 2 XRD patterns of several samples

图3 (a)PAA-NaBiF4、(b)PEI-NaBiF4、(c)PVP-NaBiF4、(d)CTAB-NaBiF4、(e)CTAC-NaBiF4和(f)CA-NaBiF4的扫描电镜照片

Fig. 3 SEM images of (a) PAA-modified NaBiF4, (b) PEI-modified NaBiF4, (c) PVP-modified NaBiF4, (d) CTAB-modified NaBiF4, (e) CTAC-modified NaBiF4, and (f) CA-modified NaBi

图4 (a)PAA-NaBiF4、(b)PEI-NaBiF4、(c)PVP-NaBiF4、(d)CTAB-NaBiF4、(e)CTAC-NaBiF4和(f)CA-NaBiF4的粒径分布图

Fig. 4 Size distributions of (a) PAA-NaBiF4, (b) PEI-NaBiF4, (c) PVP-NaBiF4, (d) CTAB-NaBiF4,(e) CTAC-NaBiF4, and (f) CA-NaBiF4

图5 PAA、PEI、PVP、CTAB、CTAC和CA六种有机配体的结构式

Fig. 5 Structural formulas of six organic ligands: PAA, PEI, PVP, CTAB, CTAC, and CA

图6 激发波长为980 nm的不同有机配体修饰的NaBiF4上转换材料的发射光谱

Fig. 6 Emission spectra of NaBiF4 upconversion material modified by different organic ligands excited at 980 nm

图7 PEI-NaBiF4上转换材料在水和乙醇中的发射光谱

Fig. 7 Emission spectra of PEI-NaBiF4 upconverting material in water and ethanol, respectively

图8 (a)CTAB-NaBiF4和(b)CTAC-NaBiF4材料在不同温度下的发射光谱

Fig. 8 Emission spectra of (a) CTAB-NaBiF4 and (b) CTAC-NaBiF4 at different temperatures

图9 (a)PAA-NaBiF4、(b)PVP-NaBiF4、(c)CTAB-NaBiF4和(d)CTAC-NaBiF4材料在不同pH条件下的发射光谱

Fig. 9 Emission spectra of (a) PAA-NaBiF4, (b) PVP-NaBiF4, (c) CTAB-NaBiF4, and (d) CTAC-NaBiF4 under different pH conditions

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有机配体对NaBiF₄:Yb³⁺/Er³⁺上转换纳米粒子形貌和发光性能的调控研究

Modulation of Morphology and Luminescence Property of NaBiF₄:Yb³⁺/Er³⁺ Upconversion Nanoparticles by Organic Ligands

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