Efficient and broadband near-infrared emitting Ca2YHf2Ga3O12: Cr3+ phosphor for anti-counterfeiting applications

IF 5.3 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Research Bulletin Pub Date : 2025-06-26 DOI:10.1016/j.materresbull.2025.113631

Linlin Wang , Yan-gai Liu , Juyu Yang , Ziyao Wang , Tonglu Sun , Lefu Mei , Hao Ding , Peishu Yang

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Abstract

Near-infrared (NIR) phosphor-converted light-emitting diodes (pc-LEDs) as efficient and compact light sources widely used in fields such as medicine, food safety, night vision, and more. However, most NIR phosphors manifest drawbacks, including relatively narrow FHWM, low photoluminescence quantum efficiency, and poor thermal and chemical stability, which limit their effectiveness in broadband applications. Therefore, a key challenge lies in designing an NIR phosphor combining a broad emission bandwidth with high quantum efficiency and excellent Thermal stability. A broadband NIR phosphor Ca₂YHf₂Ga₃O₁₂: Cr³⁺ (CYHG: Cr³⁺) was explored. The peak emission of the material occurs at 794 nm, with an FWHM of 189 nm covering 700–1100 nm. The best-performing phosphor presents the internal and external quantum efficiencies (IQE/EQE) of 82 % and 22 %, respectively. At 423 K, its luminescence remains at roughly 60 % of its room-temperature intensity. Utilizing its superior optical properties, a prototype NIR pc-LED incorporating CYHG: Cr³⁺ was developed to assess its practical feasibility. The resulting device, functioning as a compact and broadband NIR source, delivered 62 mW output at 380 mA, making it suitable for applications such as night vision, non-destructive testing, and anti-counterfeiting.

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高效，宽带近红外发射Ca2YHf2Ga3O12: Cr3+荧光粉防伪应用

近红外（NIR）磷转换发光二极管（pc- led）作为高效紧凑的光源，广泛应用于医药、食品安全、夜视等领域。然而，大多数近红外荧光粉存在缺点，包括相对较窄的FHWM，较低的光致发光量子效率，以及较差的热稳定性和化学稳定性，这限制了它们在宽带应用中的有效性。因此，设计一种具有宽发射带宽、高量子效率和优异热稳定性的近红外荧光粉是一个关键的挑战。研究了宽带近红外荧光粉Ca2YHf2Ga3O12: Cr3+ (CYHG: Cr3+)。材料的发射峰出现在794 nm处，FWHM为189 nm，覆盖700-1100 nm。性能最好的荧光粉的内部和外部量子效率（IQE/EQE）分别为82%和22%。在423 K时，其发光强度保持在室温强度的60%左右。利用其优越的光学性能，开发了一个含有CYHG: Cr3+的近红外pc-LED原型，以评估其实际可行性。由此产生的设备，作为一个紧凑的宽带近红外光源，在380毫安时提供62毫瓦的输出，使其适用于夜视、无损检测和防伪等应用。

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来源期刊

Materials Research Bulletin 工程技术-材料科学：综合

CiteScore

9.80

自引率

5.60%

发文量

372

审稿时长

42 days

期刊介绍： Materials Research Bulletin is an international journal reporting high-impact research on processing-structure-property relationships in functional materials and nanomaterials with interesting electronic, magnetic, optical, thermal, mechanical or catalytic properties. Papers purely on thermodynamics or theoretical calculations (e.g., density functional theory) do not fall within the scope of the journal unless they also demonstrate a clear link to physical properties. Topics covered include functional materials (e.g., dielectrics, pyroelectrics, piezoelectrics, ferroelectrics, relaxors, thermoelectrics, etc.); electrochemistry and solid-state ionics (e.g., photovoltaics, batteries, sensors, and fuel cells); nanomaterials, graphene, and nanocomposites; luminescence and photocatalysis; crystal-structure and defect-structure analysis; novel electronics; non-crystalline solids; flexible electronics; protein-material interactions; and polymeric ion-exchange membranes.