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

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。

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

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.