Fairoosa K. K, Veena V. P, Shilpa C. K, Jasira S. V, Nissamudeen K. M
{"title":"用于 pc-LED 应用的具有高热稳定性的紫外激发强红色发光 Gd2-x-yEuxO3:yY3+ 纳米磷酸盐","authors":"Fairoosa K. K, Veena V. P, Shilpa C. K, Jasira S. V, Nissamudeen K. M","doi":"10.1007/s13538-024-01542-7","DOIUrl":null,"url":null,"abstract":"<p>The present study deals with the synthesis and characterization of the Gd<sub>2</sub>O<sub>3</sub>:Eu<sup>3+</sup> nanophosphors and the impact of Y<sup>3+</sup> co-doping on the structural and optical properties of the Gd<sub>2</sub>O<sub>3</sub>:Eu<sup>3+</sup>. All nanophosphors are synthesised by facile low temperature solution combustion method using citric acid as a chelating agent. The XRD pattern of as-synthesised Gd<sub>2</sub>O<sub>3</sub>:Eu<sup>3+</sup> confirmed the presence of mixed-phase crystallites and upon annealing, it transforms to a cubic phase. The images of TEM and FE-SEM confirm that the samples are spherical after annealing. From the perspective of the emission spectra of Gd<sub>2</sub>O<sub>3</sub>:Eu<sup>3+</sup>, the <sup>5</sup>D<sub>0</sub> to <sup>7</sup>F<sub>2</sub> (613 nm) optical transition is the most important among the different narrow emission peaks observed in the visible region. Optimal doping concentration of Eu<sup>3+</sup> was 7 wt%. Y<sup>3+</sup> ions were incorporated into this Gd<sub>2</sub>O<sub>3</sub>:7 wt%Eu<sup>3+</sup> nanophosphors. Y<sup>3+</sup> co-activated samples crystallized in the cubic structure and exhibited a threefold enhancement in emission intensity and considerable improvement in lifetime and quantum efficiency compared to Gd<sub>2</sub>O<sub>3</sub>:Eu<sup>3+</sup> nanophosphors. Temperature-dependent PL spectra indicate that the obtained nanophosphor exhibits excellent thermal stability and the activation energy was observed to be 0.4773 eV. Beyond that, red CIE coordinates, with excellent colour purity (greater than 95%) and suitable colour-correlated temperature (below 5000 K) suggest that the prepared red-emitting nanophosphors have immense potential in phosphor converted LED (pc-LED) applications.</p>","PeriodicalId":499,"journal":{"name":"Brazilian Journal of Physics","volume":null,"pages":null},"PeriodicalIF":1.5000,"publicationDate":"2024-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"UV Excited Intense Red Emitting Gd2-x-yEuxO3:yY3+ Nanophosphors with High Thermal Stability for pc-LED Applications\",\"authors\":\"Fairoosa K. K, Veena V. P, Shilpa C. K, Jasira S. V, Nissamudeen K. M\",\"doi\":\"10.1007/s13538-024-01542-7\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<p>The present study deals with the synthesis and characterization of the Gd<sub>2</sub>O<sub>3</sub>:Eu<sup>3+</sup> nanophosphors and the impact of Y<sup>3+</sup> co-doping on the structural and optical properties of the Gd<sub>2</sub>O<sub>3</sub>:Eu<sup>3+</sup>. All nanophosphors are synthesised by facile low temperature solution combustion method using citric acid as a chelating agent. The XRD pattern of as-synthesised Gd<sub>2</sub>O<sub>3</sub>:Eu<sup>3+</sup> confirmed the presence of mixed-phase crystallites and upon annealing, it transforms to a cubic phase. The images of TEM and FE-SEM confirm that the samples are spherical after annealing. From the perspective of the emission spectra of Gd<sub>2</sub>O<sub>3</sub>:Eu<sup>3+</sup>, the <sup>5</sup>D<sub>0</sub> to <sup>7</sup>F<sub>2</sub> (613 nm) optical transition is the most important among the different narrow emission peaks observed in the visible region. Optimal doping concentration of Eu<sup>3+</sup> was 7 wt%. Y<sup>3+</sup> ions were incorporated into this Gd<sub>2</sub>O<sub>3</sub>:7 wt%Eu<sup>3+</sup> nanophosphors. Y<sup>3+</sup> co-activated samples crystallized in the cubic structure and exhibited a threefold enhancement in emission intensity and considerable improvement in lifetime and quantum efficiency compared to Gd<sub>2</sub>O<sub>3</sub>:Eu<sup>3+</sup> nanophosphors. Temperature-dependent PL spectra indicate that the obtained nanophosphor exhibits excellent thermal stability and the activation energy was observed to be 0.4773 eV. Beyond that, red CIE coordinates, with excellent colour purity (greater than 95%) and suitable colour-correlated temperature (below 5000 K) suggest that the prepared red-emitting nanophosphors have immense potential in phosphor converted LED (pc-LED) applications.</p>\",\"PeriodicalId\":499,\"journal\":{\"name\":\"Brazilian Journal of Physics\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":1.5000,\"publicationDate\":\"2024-06-27\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Brazilian Journal of Physics\",\"FirstCategoryId\":\"101\",\"ListUrlMain\":\"https://doi.org/10.1007/s13538-024-01542-7\",\"RegionNum\":4,\"RegionCategory\":\"物理与天体物理\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q2\",\"JCRName\":\"PHYSICS, MULTIDISCIPLINARY\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Brazilian Journal of Physics","FirstCategoryId":"101","ListUrlMain":"https://doi.org/10.1007/s13538-024-01542-7","RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"PHYSICS, MULTIDISCIPLINARY","Score":null,"Total":0}
UV Excited Intense Red Emitting Gd2-x-yEuxO3:yY3+ Nanophosphors with High Thermal Stability for pc-LED Applications
The present study deals with the synthesis and characterization of the Gd2O3:Eu3+ nanophosphors and the impact of Y3+ co-doping on the structural and optical properties of the Gd2O3:Eu3+. All nanophosphors are synthesised by facile low temperature solution combustion method using citric acid as a chelating agent. The XRD pattern of as-synthesised Gd2O3:Eu3+ confirmed the presence of mixed-phase crystallites and upon annealing, it transforms to a cubic phase. The images of TEM and FE-SEM confirm that the samples are spherical after annealing. From the perspective of the emission spectra of Gd2O3:Eu3+, the 5D0 to 7F2 (613 nm) optical transition is the most important among the different narrow emission peaks observed in the visible region. Optimal doping concentration of Eu3+ was 7 wt%. Y3+ ions were incorporated into this Gd2O3:7 wt%Eu3+ nanophosphors. Y3+ co-activated samples crystallized in the cubic structure and exhibited a threefold enhancement in emission intensity and considerable improvement in lifetime and quantum efficiency compared to Gd2O3:Eu3+ nanophosphors. Temperature-dependent PL spectra indicate that the obtained nanophosphor exhibits excellent thermal stability and the activation energy was observed to be 0.4773 eV. Beyond that, red CIE coordinates, with excellent colour purity (greater than 95%) and suitable colour-correlated temperature (below 5000 K) suggest that the prepared red-emitting nanophosphors have immense potential in phosphor converted LED (pc-LED) applications.
期刊介绍:
The Brazilian Journal of Physics is a peer-reviewed international journal published by the Brazilian Physical Society (SBF). The journal publishes new and original research results from all areas of physics, obtained in Brazil and from anywhere else in the world. Contents include theoretical, practical and experimental papers as well as high-quality review papers. Submissions should follow the generally accepted structure for journal articles with basic elements: title, abstract, introduction, results, conclusions, and references.