退火温度对 BaAl2O4:Eu2+/Eu3+ 纳米晶体中持续发光的影响及其在潜伏指纹检测中的应用

IF 3.5 3区化学 Q2 CHEMISTRY, INORGANIC & NUCLEAR

Dalton Transactions Pub Date : 2024-09-25 DOI:10.1039/d4dt01680g

Shivaramu N J, Divya Janardhana, Lucas Erasmus, Elizabeth Coetsee, David Edmond Motaung, Hendrik Christoffel Swart

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引用次数: 0

摘要

掺杂铕（Eu）的 BaAl2O4 荧光粉的蓝绿持续发光和潜指纹（LFP）的发光特性受退火后温度的影响很大。在 1000 至 1300 °C之间退火的BaAl2O4：1 mol% Eu 纳米荧光粉的 X 射线粉末衍射图样显示出六方铁电相。X 射线光电子能谱（XPS）显示，钡原子占据了 BaAl2O4 中两个不同的位点。XPS 和光致发光（PL）结果显示存在 Eu3+ 和 Eu2+ 态。掺 Eu 的 BaAl2O4 在 251 和 464 纳米波长的激发下显示出 Eu3+ 特有的红色发射，而在 340 和 380 纳米波长的激发下则显示出黄绿色发射。这有力地证明了电荷转移带与 Eu2+ 和 Eu3+ 离子不同能级之间的能量转移。紫外可见光漫反射和聚光光谱证实了铝酸盐中存在铬离子杂质。本研究结果表明，[Eu3+]Ba、-[Eu3+]Ba'和Oiʹʹ缺陷在宿主中引入了电子和空穴陷阱，这些陷阱成为持续发光的发光中心。使用 BaAl2O3:Eu2+/Eu3+ 荧光粉进行的 LFPs 检测显示，该荧光粉是应用于法医学的极佳标记剂。

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Influence of annealing temperature on persistent luminescence in BaAl2O4:Eu2+/Eu3+ nanocrystals and its application for latent fingerprint detection

The luminescent properties of Europium (Eu) doped BaAl2O4 phosphors were strongly influenced by post-annealing temperatures for blue-green persistent luminescence and latent fingerprints (LFPs). The X-ray powder diffraction patterns of the BaAl2O4: 1 mol% Eu nanophosphor, annealed between 1000 and 1300 °C, indicated a hexagonal ferroelectric phase. The X-ray photoelectron spectroscopy (XPS) revealed that the Ba atoms occupied two different sites in the BaAl2O4. The XPS and photoluminescence (PL) results revealed the presence of Eu3+ and Eu2+ states. The Eu-doped BaAl2O4 showed the characteristic red emission of Eu3+ at 251 and 464 nm excitations, while excitations at 340 and 380 nm showed yellowish-green emission. Strong evidence of energy transfer between a charge transfer band and the different energy levels of Eu2+ and Eu3+ ions was obtained. The existence of the Cr ion impurity in the aluminates was confirmed with UV-VIS diffuse reflectance and PL spectroscopy. The present results suggested that [Eu3+]Ba, • [Eu3+]Ba' and Oiʹʹ defects have introduced electron and hole traps in the host that acted as luminescent centers for persistent luminescence. LFPs detection using BaAl2O3:Eu2+/Eu3+ phosphor showed an excellent marking agent for applications in forensic science.

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来源期刊

Dalton Transactions 化学-无机化学与核化学

CiteScore

6.60

自引率

7.50%

发文量

1832

审稿时长

1.5 months

期刊介绍： Dalton Transactions is a journal for all areas of inorganic chemistry, which encompasses the organometallic, bioinorganic and materials chemistry of the elements, with applications including synthesis, catalysis, energy conversion/storage, electrical devices and medicine. Dalton Transactions welcomes high-quality, original submissions in all of these areas and more, where the advancement of knowledge in inorganic chemistry is significant.