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首页> 外文期刊>Crystal growth & design >A novel 3D architecture of GdPO_4 nanophosphors: Multicolored and white light emission
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A novel 3D architecture of GdPO_4 nanophosphors: Multicolored and white light emission

机译：GdPO_4纳米磷光体的新颖3D架构：彩色和白色发光

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摘要

Homogeneous monoclinic GdPO_4 particles composed of three intersecting lance-shaped crystals forming a penetration twin have been synthesized following a very restrictive, simple, and fast (10 min) method consisting of the hydrothermal reaction of gadolinium acetylacetonate with H_3PO_4 in a mixture of ethylene glycol and water at 180 C. Slightly increasing the amount of water in the solvent mixture leads to hexagonal rodlike GdPO_4·0.5H_2O nanoparticles, whereas the variation of the Gd source, PO_4 source, aging temperature, and polyol type gave rise to heterogeneous particles. The synthesis procedure is also suitable for the preparation of Eu~(3+)-, Tb ~(3+)-, and Dy~(3+)-doped GdPO_4 particles with the same morphology and crystalline structure as the undoped materials. The effect of the doping level on the luminescent properties of the twinlike nanophosphors was evaluated, finding optimum doping levels of 5, 5, and 1% for the Eu ~(3+)-, Tb~(3+)-, and Dy~(3+)-doped materials, respectively. The twinlike GdPO_4 nanophosphors were found to be more efficient than the rodlike GdPO_4 ones in terms of emission intensity. Finally, a solid-state single-phase white-light-emitting nanophosphor has been fabricated for the first time in this system by triply doping the GdPO _4 twined particles with appropriate concentrations of Eu ~(3+), Tb~(3+), and Dy~(3+) and exciting through the Gd-Ln energy-transfer band at 273 nm. In addition to this energy transfer band, other energy charge transfer processes among the three dopants (Eu~(3+), Tb~(3+), and Dy~(3+)) have been observed in the triply doped material.
机译：通过非常严格，简单和快速（10分钟）的方法（由乙酰丙酮three与H_3PO_4在乙二醇和乙醇的混合物中进行水热反应），合成了由三个相交的长矛状晶体形成穿透孪晶的均相单斜GdPO_4颗粒。在180°C的温度下，水量略有增加。六方棒状GdPO_4·0.5H_2O纳米颗粒形成，而Gd来源，PO_4来源，老化温度和多元醇类型的变化产生了异质颗粒。该合成方法也适用于制备具有与未掺杂材料相同的形态和晶体结构的Eu〜（3 +）-，Tb〜（3 +）-和Dy〜（3+）掺杂的GdPO_4颗粒。评估了掺杂水平对孪晶纳米磷光体发光性能的影响，发现Eu〜（3 +）-，Tb〜（3 +）-和Dy〜的最佳掺杂水平分别为5％，5％和1％。 （3+）掺杂的材料。在发射强度方面，发现孪晶状GdPO_4纳米磷光体比棒状GdPO_4纳米磷光体更有效。最后，通过用适当浓度的Eu〜（3 +），Tb〜（3+）三次掺杂GdPO _4孪生粒子，在该系统中首次制备了固态单相发白光纳米磷光体。和Dy〜（3+）并通过273 nm的Gd-Ln能量转移带激发。除了该能量转移带，在三重掺杂材料中还观察到了三种掺杂剂（Eu〜（3 +），Tb〜（3+）和Dy〜（3+））之间的其他能量电荷转移过程。

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