Bluish-green emission of novel BaAl2Ge2O8:Eu2+ phosphors under near-ultraviolet excitation

IF 5.2 1区化学 Q1 CHEMISTRY, APPLIED Journal of Rare Earths Pub Date : 2023-11-24 DOI:10.1016/j.jre.2023.11.016

Khaja Hussain Sk, Jae Su Yu

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Abstract

A new class of phosphor samples, denoted as Ba_1–xAl₂Ge₂O₈:xEu²⁺ (BAGO:xEu²⁺) was synthesized using Pechini-type sol–gel technique and subsequently underwent thermal reduction in CO atmosphere. The morphology and structural characteristics of both the BAGO host lattice and the Eu²⁺ ions activated BAGO phosphors were investigated through field-emission scanning electron microscopy and X-ray diffractometry analyses, respectively. The BAGO host lattice has micro-sized particles and the Rietveld refinement reveals the presence of a monoclinic crystal phase, characterized by the space group I12/c1 (No. 15). Introducing Eu²⁺ ions into Ba²⁺ sites under CO conditions reduces the particle size, switching from micrometer to nanoscale. Within the near-ultraviolet spectrum (353 nm), the BAGO:xEu²⁺ phosphors exhibit a broadband blueish-green photoluminescence (PL) emission characterized by a peak band at 492 nm. This phenomenon is attributed to the 4f⁶ 5d¹ → 4f⁷ electronic transition. The BAGO:0.02Eu²⁺ phosphor sample exhibits the strongest bluish-green PL emission, and a comprehensive description of the concentration quenching mechanism between Eu²⁺ ions is revealed. Additionally, the thermal stability of the optimized BAGO:0.02Eu²⁺ phosphor was investigated, and its activation energy was estimated. Therefore, the synthesized bluish-green BAGO:0.02Eu²⁺ phosphor holds the promise of being a novel and promising candidate for utilization in white-light-emitting diode applications.

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新型BaAl2Ge2O8:Eu2+荧光粉在近紫外激发下的蓝绿色发射

采用pechini型溶胶-凝胶技术合成了Ba1-xAl2Ge2O8:xEu2+ (BAGO:xEu2+)一类新的荧光粉样品，并在CO气氛中进行了热还原。通过场发射扫描电镜和x射线衍射分析，分别研究了BAGO主体晶格和Eu2+离子活化BAGO荧光粉的形态和结构特征。BAGO主体晶格具有微尺寸颗粒，Rietveld细化显示存在单斜晶相，其特征为空间群I12/c1 (No. 15)。在CO条件下，将Eu2+离子引入Ba2+位点可以减小颗粒尺寸，从微米级变为纳米级。在近紫外光谱(353nm)内，BAGO:xEu2+表现出宽带蓝绿色的光致发光(PL)，其峰带在492nm处。这种现象归因于4f6 - 5d1→4f7的电子跃迁。BAGO:0.02Eu2+荧光粉样品显示出最强的蓝绿色PL发射，并全面描述了Eu2+离子之间的浓度猝灭机制。此外，对优化后的BAGO:0.02Eu2+荧光粉的热稳定性进行了研究，并对其活化能进行了估算。因此，合成的蓝绿色BAGO:0.02Eu2+荧光粉有望成为白光二极管应用的一种新颖而有前途的候选材料。

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来源期刊

Journal of Rare Earths 化学-应用化学

CiteScore

8.70

自引率

14.30%

发文量

374

审稿时长

1.7 months

期刊介绍： The Journal of Rare Earths reports studies on the 17 rare earth elements. It is a unique English-language learned journal that publishes works on various aspects of basic theory and applied science in the field of rare earths (RE). The journal accepts original high-quality original research papers and review articles with inventive content, and complete experimental data. It represents high academic standards and new progress in the RE field. Due to the advantage of abundant RE resources of China, the research on RE develops very actively, and papers on the latest progress in this field emerge every year. It is not only an important resource in which technicians publish and obtain their latest research results on RE, but also an important way of reflecting the updated progress in RE research field. The Journal of Rare Earths covers all research and application of RE rare earths including spectroscopy, luminescence and phosphors, rare earth catalysis, magnetism and magnetic materials, advanced rare earth materials, RE chemistry & hydrometallurgy, RE metallography & pyrometallurgy, RE new materials, RE solid state physics & solid state chemistry, rare earth applications, RE analysis & test, RE geology & ore dressing, etc.