阳离子取代增强宽带近红外Cr3+活化磷酸盐荧光粉的发光性能

IF 5.1 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Ceramics International Pub Date : 2025-04-01 DOI:10.1016/j.ceramint.2024.12.521

Bao Yan , Jun Wen , Yueyu Zhou , Qiwang Sha , Xiaoxiao Huang , Zhaoshi Dong , Chuanlong Wang , Qiang Wang , Lixing Ning , Chang-Kui Duan

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引用次数: 0

摘要

宽带近红外（NIR）荧光粉对于便携式近红外光源的发展至关重要。然而，在宽带近红外荧光粉的研究领域，如何开发出发射波长在 830 nm 以上的廉价、高效、稳定发光的荧光粉仍然是一个重大挑战。本研究成功合成了一种新型宽带近红外荧光粉 CaTi4(PO4)6:Cr3+，其发射峰为 832 nm，半最大全宽（FWHM）为 165 nm。通过 Cd2+ 阳离子取代 Ca2+，CaTi4(PO4)6:Cr3+ 的量子效率和热稳定性得到了显著提高，这归因于 CrO6 八面体的晶格对称性降低，从而打破了 Cr3+ 离子的禁用跃迁。CdTi4(PO4)6:0.09Cr3+ 的内部量子效率（IQE）为 46.63%，而其在 373 K 时的发光强度仍为 298 K 时初始值的 58.63%。通过将 CdTi4(PO4)6:0.09Cr3+ 和 470 nm 蓝光 LED 芯片相结合，制备出了一种便携式近红外荧光粉转换发光二极管（pc-LED），在 100 mA 驱动电流下，其输出功率为 14.4 mW，光电转换效率为 5.49 %。评估了近红外 pc-LED 在生物成像和夜视中的潜在应用。

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Enhancement of luminescence properties of broadband NIR Cr3+-activated phosphate phosphors through cationic substitution

The broadband near-infrared (NIR) phosphors are essential for the advancement of portable NIR light sources. Nevertheless, the development of inexpensive, high-efficiency, and stable luminescence phosphors at emission wavelength above 830 nm remains a significant challenge in the research field of broadband NIR phosphors. In this study, a novel broadband NIR phosphor CaTi₄(PO₄)₆:Cr³⁺ is successfully synthesized with the emission peak at 832 nm and a full width of half maximum (FWHM) of 165 nm. The quantum efficiency and thermal stability of CaTi₄(PO₄)₆:Cr³⁺ are significantly improved through the cationic substitution of Ca²⁺ by Cd²⁺, which is attributed to the reduction of the lattice symmetry of CrO₆ octahedrons and consequently the breaking of the forbidden transitions of Cr³⁺ ions. The CdTi₄(PO₄)₆:0.09Cr³⁺ exhibited an internal quantum efficiency (IQE) of 46.63 %, while its luminescence intensity at 373 K remains ∼58.63 % of the initial value at 298 K. A portable NIR phosphor-converted light-emitting-diode (pc-LED) was fabricated by combining the CdTi₄(PO₄)₆:0.09Cr³⁺ and a 470 nm blue LED chip, which shows an output power of 14.4 mW and photoelectric conversion efficiency of 5.49 % at a 100 mA driving current. The potential application of NIR pc-LED in bioimaging and night vision is evaluated.

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来源期刊

Ceramics International 工程技术-材料科学：硅酸盐

CiteScore

9.40

自引率

15.40%

发文量

4558

审稿时长

25 days

期刊介绍： Ceramics International covers the science of advanced ceramic materials. The journal encourages contributions that demonstrate how an understanding of the basic chemical and physical phenomena may direct materials design and stimulate ideas for new or improved processing techniques, in order to obtain materials with desired structural features and properties. Ceramics International covers oxide and non-oxide ceramics, functional glasses, glass ceramics, amorphous inorganic non-metallic materials (and their combinations with metal and organic materials), in the form of particulates, dense or porous bodies, thin/thick films and laminated, graded and composite structures. Process related topics such as ceramic-ceramic joints or joining ceramics with dissimilar materials, as well as surface finishing and conditioning are also covered. Besides traditional processing techniques, manufacturing routes of interest include innovative procedures benefiting from externally applied stresses, electromagnetic fields and energetic beams, as well as top-down and self-assembly nanotechnology approaches. In addition, the journal welcomes submissions on bio-inspired and bio-enabled materials designs, experimentally validated multi scale modelling and simulation for materials design, and the use of the most advanced chemical and physical characterization techniques of structure, properties and behaviour. Technologically relevant low-dimensional systems are a particular focus of Ceramics International. These include 0, 1 and 2-D nanomaterials (also covering CNTs, graphene and related materials, and diamond-like carbons), their nanocomposites, as well as nano-hybrids and hierarchical multifunctional nanostructures that might integrate molecular, biological and electronic components.