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一种新型可调节颜色的荧光粉，NaGdF:Ln（Ln = Eu、Tb、Dy、Sm、Ho）亚微晶体：结构、发光和能量传递特性。

A novel color-tunable phosphor, NaGdF:Ln (Ln = Eu, Tb, Dy, Sm, Ho) sub-microcrystals: structure, luminescence and energy transfer properties.

机构信息

College of Chemistry, Jilin University, Changchun 130026, PR China.

出版信息

Dalton Trans. 2018 Jul 24;47(29):9795-9803. doi: 10.1039/c8dt01991f.

DOI:10.1039/c8dt01991f
PMID:29993070
Abstract

Ln3+-Doped fluorides are economical and highly efficient luminescent materials, which play a crucial role in LEDs, biolabeling, and sensors. Therefore, Na5Gd9F32:Ln3+ sub-microspheres with tunable multicolor emissions were successfully synthesized via a simple water bath method employing colloidal Gd(OH)CO3 spheres as precursors. Samples were characterized by XRD, SEM, TEM, EDS and PL. It was found that the hydrolysis of BF4- ions had a dynamic effect on the retention of the morphology of the product owing to the mild reaction environment caused by the low hydrolysis rate of BF4- ions. Upon excitation by ultraviolet light, the Na5Gd9F32:Ln3+ (Ln = Eu, Tb, Dy, Sm, Ho) phosphors underwent characteristic f-f transitions and gave rise to red, green, green, yellow, and pale green emissions, respectively. Moreover, various emission colors could be obtained by using different excitation wavelengths and adjusting the Eu3+/Tb3+ molar ratio owing to energy transfer between Tb3+ and Eu3+ ions in the Na5Gd9F32 host. The energy transfer mechanism was demonstrated to be a dipole-dipole interaction. The multicolor luminescent phosphors with a certain dopant concentration based on a single host and excitation wavelength may have potential applications in the field of lighting displays.

摘要

Ln3+-掺杂氟化物是经济高效的发光材料，在 LED、生物标记和传感器中发挥着关键作用。因此，通过采用胶体 Gd(OH)CO3 球作为前体制备了具有可调多色发射的 Na5Gd9F32:Ln3+亚微米球。通过 XRD、SEM、TEM、EDS 和 PL 对样品进行了表征。结果发现，由于 BF4-离子的水解速率较低，导致反应环境温和，BF4-离子的水解对产物形态的保留具有动态效应。在紫外光激发下，Na5Gd9F32:Ln3+（Ln=Eu、Tb、Dy、Sm、Ho）荧光粉发生特征 f-f 跃迁，分别产生红色、绿色、绿色、黄色和浅绿色发射。此外，由于 Tb3+和 Eu3+离子在 Na5Gd9F32 基质中发生能量转移，通过使用不同的激发波长和调整 Eu3+/Tb3+摩尔比，可以获得各种发射颜色。能量转移机制被证明是偶极-偶极相互作用。基于单一主体和激发波长的具有一定掺杂浓度的多色发光荧光粉可能在照明显示领域具有潜在应用。

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引用本文的文献

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