Structural, optical, and color-tunable luminescence of Dy3+-doped Ca3Ga4O9 phosphors for white-light emitting diode applications

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

Materials Science and Engineering B-advanced Functional Solid-state Materials Pub Date : 2024-09-28 DOI:10.1016/j.mseb.2024.117724

Irfan Ayoub , Umer Mushtaq , M.Y.A. Yagoub , Sudipta Som , Hendrik C. Swart , Vijay Kumar

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引用次数: 0

Abstract

A series of single-phase Dy³⁺-activated Ca₃Ga₄O₉ phosphors were synthesized using a high-temperature solid-state reaction method for white light. The phase purity and crystal structure of the synthesized phosphors were verified through X-ray powder diffraction patterns. Surface characteristics and elemental composition were analyzed using field emission scanning electron microscopy and energy-dispersive X-ray spectroscopy. X-ray photoelectron spectroscopy was used to validate the elemental oxidation states and gain insights into the influence of structural properties. The bandgap of the synthesized phosphor and its doping variation were investigated through diffuse reflectance spectra. The bandgap value for the undoped phosphor was determined to be 4.57 eV, exhibiting a slight decrease to 4.45 eV as the doping concentration was increased to 2 mol%. An analysis was conducted on the photoluminescence phenomenon by recording the excitation and emission spectra. In addition to the vibrant blue light emitted by the host materials, fundamental emission peaks corresponding to Dy³⁺ [⁴F_9/2 → ⁶H_J (J=15/2, 13/2, 11/2, 9/2)] were also observed. The emission phenomenon was further verified by recording the Cathodoluminescence spectra, which closely resemble the recorded emission spectra. Judd-Ofelt analysis showed that the Judd-Ofelt intensity parameter Ω₂ is more responsive to the changes in the ligand environment. Chromaticity analysis indicated the proximity of the International Commission on Illumination coordinates for 1 mol% (0.3259, 0.3475) to the standard white point (0.3333, 0.3333), yielding a correlated color temperature of 5798 K. Thermal studies revealed that the synthesized phosphors exhibited excellent thermal stability up to 673.15 K, with an activation energy of 0.28 eV. All the experimental findings prove that the synthesized phosphor exhibits high potential and can prove to be as a proficient contender for white light applications.

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用于白光发光二极管的 Dy3+ 掺杂 Ca3Ga4O9 荧光粉的结构、光学和颜色可调发光特性

采用高温固态反应方法合成了一系列单相 Dy3+ 激活的 Ca3Ga4O9 荧光粉，用于白光。通过 X 射线粉末衍射图样验证了合成荧光粉的相纯度和晶体结构。利用场发射扫描电子显微镜和能量色散 X 射线光谱分析了荧光粉的表面特征和元素组成。X 射线光电子能谱被用来验证元素的氧化态，并深入了解结构特性的影响。通过漫反射光谱研究了合成荧光粉的带隙及其掺杂变化。未掺杂荧光粉的带隙值被测定为 4.57 eV，当掺杂浓度增加到 2 mol%时，带隙值略微下降到 4.45 eV。通过记录激发光谱和发射光谱，对光致发光现象进行了分析。除了宿主材料发出的明亮蓝光外，还观察到与 Dy3+ [4F9/2 → 6HJ (J=15/2, 13/2, 11/2, 9/2)] 相对应的基本发射峰。通过记录阴极荧光光谱进一步验证了发射现象，该光谱与记录的发射光谱非常相似。Judd-Ofelt 分析表明，Judd-Ofelt 强度参数 Ω2 对配体环境的变化反应更灵敏。色度分析表明，1 mol% 的国际照明委员会坐标（0.3259，0.3475）接近标准白点（0.3333，0.3333），相关色温为 5798 K。所有的实验结果都证明，合成荧光粉具有很高的潜力，可以被证明是白光应用的有力竞争者。

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来源期刊

Materials Science and Engineering B-advanced Functional Solid-state Materials 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.