{"title":"新型BaAl2Ge2O8:Eu2+荧光粉在近紫外激发下的蓝绿色发射","authors":"Khaja Hussain Sk, Jae Su Yu","doi":"10.1016/j.jre.2023.11.016","DOIUrl":null,"url":null,"abstract":"<p>A new class of phosphor samples, denoted as Ba<sub>1–<em>x</em></sub>Al<sub>2</sub>Ge<sub>2</sub>O<sub>8</sub>:<em>x</em>Eu<sup>2+</sup> (BAGO:<em>x</em>Eu<sup>2+</sup>) 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 Eu<sup>2+</sup> 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 <em>I</em>12/<em>c</em>1 (No. 15). Introducing Eu<sup>2+</sup> ions into Ba<sup>2+</sup> sites under CO conditions reduces the particle size, switching from micrometer to nanoscale. Within the near-ultraviolet spectrum (353 nm), the BAGO:<em>x</em>Eu<sup>2+</sup> phosphors exhibit a broadband blueish-green photoluminescence (PL) emission characterized by a peak band at 492 nm. This phenomenon is attributed to the 4f<sup>6</sup> 5d<sup>1</sup> → 4f<sup>7</sup> electronic transition. The BAGO:0.02Eu<sup>2+</sup> phosphor sample exhibits the strongest bluish-green PL emission, and a comprehensive description of the concentration quenching mechanism between Eu<sup>2+</sup> ions is revealed. Additionally, the thermal stability of the optimized BAGO:0.02Eu<sup>2+</sup> phosphor was investigated, and its activation energy was estimated. Therefore, the synthesized bluish-green BAGO:0.02Eu<sup>2+</sup> phosphor holds the promise of being a novel and promising candidate for utilization in white-light-emitting diode applications.</p>","PeriodicalId":16940,"journal":{"name":"Journal of Rare Earths","volume":"22 1","pages":""},"PeriodicalIF":5.2000,"publicationDate":"2023-11-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Bluish-green emission of novel BaAl2Ge2O8:Eu2+ phosphors under near-ultraviolet excitation\",\"authors\":\"Khaja Hussain Sk, Jae Su Yu\",\"doi\":\"10.1016/j.jre.2023.11.016\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<p>A new class of phosphor samples, denoted as Ba<sub>1–<em>x</em></sub>Al<sub>2</sub>Ge<sub>2</sub>O<sub>8</sub>:<em>x</em>Eu<sup>2+</sup> (BAGO:<em>x</em>Eu<sup>2+</sup>) 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 Eu<sup>2+</sup> 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 <em>I</em>12/<em>c</em>1 (No. 15). Introducing Eu<sup>2+</sup> ions into Ba<sup>2+</sup> sites under CO conditions reduces the particle size, switching from micrometer to nanoscale. Within the near-ultraviolet spectrum (353 nm), the BAGO:<em>x</em>Eu<sup>2+</sup> phosphors exhibit a broadband blueish-green photoluminescence (PL) emission characterized by a peak band at 492 nm. This phenomenon is attributed to the 4f<sup>6</sup> 5d<sup>1</sup> → 4f<sup>7</sup> electronic transition. The BAGO:0.02Eu<sup>2+</sup> phosphor sample exhibits the strongest bluish-green PL emission, and a comprehensive description of the concentration quenching mechanism between Eu<sup>2+</sup> ions is revealed. Additionally, the thermal stability of the optimized BAGO:0.02Eu<sup>2+</sup> phosphor was investigated, and its activation energy was estimated. Therefore, the synthesized bluish-green BAGO:0.02Eu<sup>2+</sup> phosphor holds the promise of being a novel and promising candidate for utilization in white-light-emitting diode applications.</p>\",\"PeriodicalId\":16940,\"journal\":{\"name\":\"Journal of Rare Earths\",\"volume\":\"22 1\",\"pages\":\"\"},\"PeriodicalIF\":5.2000,\"publicationDate\":\"2023-11-24\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Journal of Rare Earths\",\"FirstCategoryId\":\"92\",\"ListUrlMain\":\"https://doi.org/10.1016/j.jre.2023.11.016\",\"RegionNum\":1,\"RegionCategory\":\"化学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q1\",\"JCRName\":\"CHEMISTRY, APPLIED\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Rare Earths","FirstCategoryId":"92","ListUrlMain":"https://doi.org/10.1016/j.jre.2023.11.016","RegionNum":1,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"CHEMISTRY, APPLIED","Score":null,"Total":0}
Bluish-green emission of novel BaAl2Ge2O8:Eu2+ phosphors under near-ultraviolet excitation
A new class of phosphor samples, denoted as Ba1–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.
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.
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