Highly Efficient and Thermally Stable Eu2+-Doped Ca9Nd(PO₄)7 Phosphor for Near-Ultraviolet White-Emission LED Applications.

Jian Zhou, Si-Li Ren
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引用次数: 0

Abstract

Various Eu2+-based Ca9Nd(PO₄)7 (CNP:xEu2+, with different x values) materials are prepared via facile solid-state reaction. Their crystal structures are investigated in detail by means of the Rietveld refinement. The structure of CNP:Eu2+ with a trigonal lattice is analogous to that of β-Ca₃(PO₄)₂. Therefore, Eu2+ ions tend to incorporate calcium sites in the host. All the obtained samples can be excited using near ultraviolet (nUV) light to present blue-green emission. An optimal dopant concentration is verified at x = 0.8 with a large critical interaction radius (11.21 Å). The mechanism of the concentration quenching effect is assigned to the multipole-multipole interaction. CNP:xEu2+ possesses a short decay lifetime of ∼60 μs and can endure severe working conditions thanks to its great thermal stability. The relative photoluminescence (PL) intensity of CNP:0.8Eu2+ can retain 84.75% of the pristine intensity measured at room temperature, and the relative intensity remains as high as 69.97% at 423 K. The CNP:Eu2+ phosphors also show great performance in the WLED demonstration. The correlated color temperature (CCT) of the prototype device is 3404 K, with an extremely high Ra (97.6). Therefore, CNP:xEu2+ could be regarded as a promising alternative to blue green phosphors in nUV chip-based WLED applications.

用于近紫外白光发光LED的高效热稳定Eu2+掺杂Ca9Nd(PO₄)7荧光粉。
通过简单的固相反应制备了多种Eu2+基Ca9Nd(PO₄)7 (CNP:xEu2+, x值不同)材料。用里特费尔德精化方法对它们的晶体结构进行了详细的研究。具有三角晶格的CNP:Eu2+的结构与β-Ca₃(PO₄)₂的结构类似。因此,Eu2+离子倾向于结合宿主体内的钙位点。所有得到的样品都可以用近紫外光激发,呈现蓝绿色发射。在x = 0.8和较大的临界相互作用半径(11.21 Å)下验证了最佳掺杂浓度。浓度猝灭效应的机理为多极-多极相互作用。CNP:xEu2+具有约60 μs的短衰变寿命,并且由于其良好的热稳定性,可以承受恶劣的工作条件。CNP:0.8Eu2+的相对光致发光(PL)强度在室温下可保持原始测量强度的84.75%,在423 K时相对光致发光强度仍高达69.97%。CNP:Eu2+荧光粉在WLED演示中也表现出良好的性能。原型器件的相关色温(CCT)为3404 K,具有极高的Ra(97.6)。因此,CNP:xEu2+可以被认为是基于nUV芯片的WLED应用中蓝绿色荧光粉的有前途的替代品。
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来源期刊
Journal of nanoscience and nanotechnology
Journal of nanoscience and nanotechnology 工程技术-材料科学:综合
自引率
0.00%
发文量
0
审稿时长
3.6 months
期刊介绍: JNN is a multidisciplinary peer-reviewed journal covering fundamental and applied research in all disciplines of science, engineering and medicine. JNN publishes all aspects of nanoscale science and technology dealing with materials synthesis, processing, nanofabrication, nanoprobes, spectroscopy, properties, biological systems, nanostructures, theory and computation, nanoelectronics, nano-optics, nano-mechanics, nanodevices, nanobiotechnology, nanomedicine, nanotoxicology.
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