Development of highly thermal-stable blue emitting Y4Al2O9:Bi3+ phosphors for w-LEDs, fingerprint and data security applications

IF 3.9 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Science and Engineering: B Pub Date : 2024-11-30 DOI:10.1016/j.mseb.2024.117833

R. Arunakumar , B.R. Radha Krushna , G. Ramakrishna , G.R. Mamatha , S.C. Sharma , Satish Kumar , P. Suvarna , Liza Mohapatra , Augustine George , R. Sudarmani , H. Nagabhushana

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Abstract

A new blue-emitting Y₄Al₂O₉:Bi³⁺ (YAO:Bi³⁺) phosphor is synthesized using the solution combustion method with mushroom extract as a binder. Its structural properties, concentration effects, temperature-dependent luminescence, and performance in LED devices are thoroughly investigated. Upon excitation at 367 nm, a strong blue light emission at 423 nm is observed, attributed to the ³P₁→¹S₀ transition of Bi³⁺. The quantum efficiency reached approximately 63.5 %. The CIE diagram shows that the emission colour falls within the intense blue region, achieving a colour purity (CP) of 94 %. YAO:Bi³⁺ exhibits strong absorption in the near-ultraviolet range (330–400 nm), making it suitable for LEDs powered by near-ultraviolet chips. A thermal quenching experiment revealed an activation energy (E_a) of 0.323 eV, indicating that this YAO:Bi³⁺ phosphor possesses good thermal stability. This study showcases the use of YAO:Bi³⁺ phosphor in encapsulated LED devices. The device’s Commission Internationale de l’Éclairage (CIE) coordinates are (0.325, 0.310), with a high colour rendering index (CRI) of 94.70 and a low correlated colour temperature (CCT) of 5915 K at a current of 120 mA. These properties indicate that this phosphor is suitable for developing white LED devices powered by near-ultraviolet chips. The optimized YAO:Bi³⁺ phosphor is employed to enhance the detection of Level I-III fingerprint (FP) details with high resolution and contrast, showing effective visualization of latent fingerprints (LFPs) on various substrates. Furthermore, it is used as a model for developing fluorescent ink, which is applied to different media. The results suggest that YAO:Bi³⁺ phosphor has significant potential for applications in w-LEDs, advanced forensics, and anti-counterfeiting ink technologies.

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高热稳定蓝光Y4Al2O9:Bi3+荧光粉的开发，用于w- led，指纹和数据安全应用

以香菇提取物为粘合剂，采用溶液燃烧法制备了一种新型发蓝光Y4Al2O9:Bi3+ (YAO:Bi3+)荧光粉。深入研究了其结构特性、浓度效应、温度依赖性发光以及在LED器件中的性能。在367nm激发时，在423nm处观察到强烈的蓝光发射，这是由于Bi3+的3P1→1so0跃迁。量子效率达到63.5%左右。CIE图显示，发射颜色落在深蓝色区域内，达到94%的颜色纯度（CP）。YAO:Bi3+在近紫外（330 - 400nm）范围内具有很强的吸收能力，适合近紫外芯片驱动的led。热猝灭实验表明，该YAO:Bi3+荧光粉的活化能（Ea）为0.323 eV，具有良好的热稳定性。本研究展示了YAO:Bi3+荧光粉在封装LED器件中的应用。该器件的国际委员会Éclairage （CIE）坐标为（0.325,0.310），在120 mA电流下，显色指数（CRI）为94.70，相关色温（CCT）为5915 K。这些特性表明，该荧光粉适合开发由近紫外芯片供电的白光LED器件。利用优化后的YAO:Bi3+荧光粉增强了对I-III级指纹（FP）细节的高分辨率和高对比度检测，显示了不同底物上潜在指纹（lfp）的有效可视化。并以此作为开发荧光油墨的模型，应用于不同的介质。结果表明，YAO:Bi3+荧光粉在w- led、高级取证和防伪油墨技术方面具有巨大的应用潜力。

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来源期刊

Materials Science and Engineering: B 工程技术-材料科学：综合

CiteScore

5.60

自引率

2.80%

发文量

481

审稿时长

3.5 months

期刊介绍： The journal provides an international medium for the publication of theoretical and experimental studies and reviews related to the electronic, electrochemical, ionic, magnetic, optical, and biosensing properties of solid state materials in bulk, thin film and particulate forms. Papers dealing with synthesis, processing, characterization, structure, physical properties and computational aspects of nano-crystalline, crystalline, amorphous and glassy forms of ceramics, semiconductors, layered insertion compounds, low-dimensional compounds and systems, fast-ion conductors, polymers and dielectrics are viewed as suitable for publication. Articles focused on nano-structured aspects of these advanced solid-state materials will also be considered suitable.