{"title":"新颖的深红色光致发光,Sr2EuAlO5 中 702 纳米波长的 5D0-7F4 与 620 纳米波长的 5D0-7F2 的发光比非常高","authors":"Muhammad Kamran , Chenglong Xia , Syeda Duaa Zahra , Xiao He, Bingyang Zeng, Chunmiao Cui, Jiahui Yang, Xiaoguang Liu, Ling Li","doi":"10.1016/j.jlumin.2024.120913","DOIUrl":null,"url":null,"abstract":"<div><div>A series of novel red-emitting Sr<sub>2</sub>EuAlO<sub>5</sub> phosphors, both undoped and doped with rare earth elements Sm, Ce and Tb ions were synthesized using a solid-state method. The photoluminescent properties were investigated. For the Sr<sub>2</sub>EuAlO<sub>5</sub> phosphor, the excitation spectra exhibited a broad charge transfer band ranging from 250 to 360 nm and some sharp peaks ranging from 450 to 550 nm, with the highest sharp peak at 463 nm. The emission spectra showed the red emission in both undoped and doped Sr<sub>2</sub>EuAlO<sub>5</sub> phosphors, with the highest peak at 702 nm attributed to <sup>5</sup>D<sub>0</sub>→<sup>7</sup>F<sub>4</sub> transition under different excitation wavelengths of 393 and 463 nm. Doping Tb ions into the host lattice Sr<sub>2</sub>EuAlO<sub>5</sub> resulted in an extraordinary ultra-high luminescence ratio of <sup>5</sup>D<sub>0</sub><sup>−7</sup>F<sub>4</sub> at 702 nm to <sup>5</sup>D<sub>0</sub><sup>−7</sup>F<sub>2</sub> at 620 nm, which was approximately three times higher than that of Sr<sub>2</sub>EuAlO<sub>5</sub>. Ce-doped Sr<sub>2</sub>EuAlO<sub>5</sub> phosphors altered the shape of excitation spectra and charge transfer phenomenon was observed, while Sm-doped Sr<sub>2</sub>EuAlO<sub>5</sub> significantly enhancing the emission intensity at 702 nm. In this study site preferential occupancy based on bond energy calculations was reported for the first time to theoretically confirm the dopant ion sites. The results indicate that Sm and Tb ions preferentially occupy the Eu1 sites, while Ce ions only occupied the Sr2 positions. The CIE values (x = 0.6311, y = 0.3512) and high color purity of 94.8 % in Sr<sub>2</sub>EuAlO<sub>5</sub>: 10 % Sm ions indicate its suitability as a red phosphor for WLEDs.</div></div>","PeriodicalId":16159,"journal":{"name":"Journal of Luminescence","volume":"277 ","pages":"Article 120913"},"PeriodicalIF":3.3000,"publicationDate":"2024-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Novel deep-red photoluminescence with extraordinary high luminescence ratio of 5D0−7F4 at 702 nm to 5D0−7F2 at 620 nm in Sr2EuAlO5\",\"authors\":\"Muhammad Kamran , Chenglong Xia , Syeda Duaa Zahra , Xiao He, Bingyang Zeng, Chunmiao Cui, Jiahui Yang, Xiaoguang Liu, Ling Li\",\"doi\":\"10.1016/j.jlumin.2024.120913\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><div>A series of novel red-emitting Sr<sub>2</sub>EuAlO<sub>5</sub> phosphors, both undoped and doped with rare earth elements Sm, Ce and Tb ions were synthesized using a solid-state method. The photoluminescent properties were investigated. For the Sr<sub>2</sub>EuAlO<sub>5</sub> phosphor, the excitation spectra exhibited a broad charge transfer band ranging from 250 to 360 nm and some sharp peaks ranging from 450 to 550 nm, with the highest sharp peak at 463 nm. The emission spectra showed the red emission in both undoped and doped Sr<sub>2</sub>EuAlO<sub>5</sub> phosphors, with the highest peak at 702 nm attributed to <sup>5</sup>D<sub>0</sub>→<sup>7</sup>F<sub>4</sub> transition under different excitation wavelengths of 393 and 463 nm. Doping Tb ions into the host lattice Sr<sub>2</sub>EuAlO<sub>5</sub> resulted in an extraordinary ultra-high luminescence ratio of <sup>5</sup>D<sub>0</sub><sup>−7</sup>F<sub>4</sub> at 702 nm to <sup>5</sup>D<sub>0</sub><sup>−7</sup>F<sub>2</sub> at 620 nm, which was approximately three times higher than that of Sr<sub>2</sub>EuAlO<sub>5</sub>. Ce-doped Sr<sub>2</sub>EuAlO<sub>5</sub> phosphors altered the shape of excitation spectra and charge transfer phenomenon was observed, while Sm-doped Sr<sub>2</sub>EuAlO<sub>5</sub> significantly enhancing the emission intensity at 702 nm. In this study site preferential occupancy based on bond energy calculations was reported for the first time to theoretically confirm the dopant ion sites. The results indicate that Sm and Tb ions preferentially occupy the Eu1 sites, while Ce ions only occupied the Sr2 positions. The CIE values (x = 0.6311, y = 0.3512) and high color purity of 94.8 % in Sr<sub>2</sub>EuAlO<sub>5</sub>: 10 % Sm ions indicate its suitability as a red phosphor for WLEDs.</div></div>\",\"PeriodicalId\":16159,\"journal\":{\"name\":\"Journal of Luminescence\",\"volume\":\"277 \",\"pages\":\"Article 120913\"},\"PeriodicalIF\":3.3000,\"publicationDate\":\"2024-09-26\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Journal of Luminescence\",\"FirstCategoryId\":\"101\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S0022231324004770\",\"RegionNum\":3,\"RegionCategory\":\"物理与天体物理\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q2\",\"JCRName\":\"OPTICS\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Luminescence","FirstCategoryId":"101","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0022231324004770","RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"OPTICS","Score":null,"Total":0}
Novel deep-red photoluminescence with extraordinary high luminescence ratio of 5D0−7F4 at 702 nm to 5D0−7F2 at 620 nm in Sr2EuAlO5
A series of novel red-emitting Sr2EuAlO5 phosphors, both undoped and doped with rare earth elements Sm, Ce and Tb ions were synthesized using a solid-state method. The photoluminescent properties were investigated. For the Sr2EuAlO5 phosphor, the excitation spectra exhibited a broad charge transfer band ranging from 250 to 360 nm and some sharp peaks ranging from 450 to 550 nm, with the highest sharp peak at 463 nm. The emission spectra showed the red emission in both undoped and doped Sr2EuAlO5 phosphors, with the highest peak at 702 nm attributed to 5D0→7F4 transition under different excitation wavelengths of 393 and 463 nm. Doping Tb ions into the host lattice Sr2EuAlO5 resulted in an extraordinary ultra-high luminescence ratio of 5D0−7F4 at 702 nm to 5D0−7F2 at 620 nm, which was approximately three times higher than that of Sr2EuAlO5. Ce-doped Sr2EuAlO5 phosphors altered the shape of excitation spectra and charge transfer phenomenon was observed, while Sm-doped Sr2EuAlO5 significantly enhancing the emission intensity at 702 nm. In this study site preferential occupancy based on bond energy calculations was reported for the first time to theoretically confirm the dopant ion sites. The results indicate that Sm and Tb ions preferentially occupy the Eu1 sites, while Ce ions only occupied the Sr2 positions. The CIE values (x = 0.6311, y = 0.3512) and high color purity of 94.8 % in Sr2EuAlO5: 10 % Sm ions indicate its suitability as a red phosphor for WLEDs.
期刊介绍:
The purpose of the Journal of Luminescence is to provide a means of communication between scientists in different disciplines who share a common interest in the electronic excited states of molecular, ionic and covalent systems, whether crystalline, amorphous, or liquid.
We invite original papers and reviews on such subjects as: exciton and polariton dynamics, dynamics of localized excited states, energy and charge transport in ordered and disordered systems, radiative and non-radiative recombination, relaxation processes, vibronic interactions in electronic excited states, photochemistry in condensed systems, excited state resonance, double resonance, spin dynamics, selective excitation spectroscopy, hole burning, coherent processes in excited states, (e.g. coherent optical transients, photon echoes, transient gratings), multiphoton processes, optical bistability, photochromism, and new techniques for the study of excited states. This list is not intended to be exhaustive. Papers in the traditional areas of optical spectroscopy (absorption, MCD, luminescence, Raman scattering) are welcome. Papers on applications (phosphors, scintillators, electro- and cathodo-luminescence, radiography, bioimaging, solar energy, energy conversion, etc.) are also welcome if they present results of scientific, rather than only technological interest. However, papers containing purely theoretical results, not related to phenomena in the excited states, as well as papers using luminescence spectroscopy to perform routine analytical chemistry or biochemistry procedures, are outside the scope of the journal. Some exceptions will be possible at the discretion of the editors.