Mudasir Farooq, Haqnawaz Rafiq, Irfan Nazir, Seemin Rubab and Mir Hashim Rasool
{"title":"用于白光发光二极管的新型 Dy3+ → Sm3+ 共掺 NaCaPO4 荧光粉的结构、光致发光和能量传递研究。","authors":"Mudasir Farooq, Haqnawaz Rafiq, Irfan Nazir, Seemin Rubab and Mir Hashim Rasool","doi":"10.1039/D4DT01020E","DOIUrl":null,"url":null,"abstract":"<p >In this study, Dy<small><sup>3+</sup></small>-doped and Dy<small><sup>3+</sup></small>/Sm<small><sup>3+</sup></small> co-doped NaCaPO<small><sub>4</sub></small> white-emitting polycrystalline phosphor samples were synthesized using a solid-state reaction method. The samples were characterized by powder X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), Field-emission scanning electron microscopy (FE-SEM), and Photoluminescence (PL) analysis. The phase purity characterization and crystal structural analysis were done using the Rietveld refinement-based FullProf Suite software. The Rietveld refinement result confirms single-phase formation for both Sm<small><sup>3+</sup></small> and Dy<small><sup>3+</sup></small>/Sm<small><sup>3+</sup></small> co-doped NaCaPO<small><sub>4</sub></small> samples with an orthorhombic structure and with a monotonic change in lattice parameters with doping. The PL studies of the Dy<small><sup>3+</sup></small>-doped samples revealed two emission bands. However, at 352 nm, the Dy<small><sup>3+</sup></small>/Sm<small><sup>3+</sup></small>-co-doped samples revealed distinctive emission bands for both ions. The emission peaks at 480 nm (blue) and 573 nm (yellow) are related to the <small><sup>4</sup></small>F<small><sub>9/2</sub></small> → <small><sup>6</sup></small>H<small><sub>15/2</sub></small> and <small><sup>4</sup></small>F<small><sub>9/2</sub></small> → <small><sup>6</sup></small>H<small><sub>13/2</sub></small> transitions of Dy<small><sup>3+</sup></small> ions; however, the emission peaks at 600 nm and 647 nm are attributed to the <small><sup>4</sup></small>G<small><sub>5/2</sub></small> → <small><sup>6</sup></small>H<small><sub>7/2</sub></small> and <small><sup>4</sup></small>G<small><sub>5/2</sub></small> → <small><sup>6</sup></small>H<small><sub>7/2</sub></small> transitions of Sm<small><sup>3+</sup></small> ions. The intensity of the Dy<small><sup>3+</sup></small> emissions decreased as the Sm<small><sup>3+</sup></small> levels increased but the emission intensity of the Sm<small><sup>3+</sup></small> ions increased. The co-doping of Sm<small><sup>3+</sup></small> ions in Dy<small><sup>3+</sup></small>-doped phosphors results in unique characteristics due to the energy transfer (ET) from Dy<small><sup>3+</sup></small> → Sm<small><sup>3+</sup></small> ions. The effectiveness of this ET from Dy<small><sup>3+</sup></small> → Sm<small><sup>3+</sup></small> ions is positively correlated with the dopant amounts of the Sm<small><sup>3+</sup></small> ions. The interaction mechanisms have been identified as dipole–dipole based on Dexter's energy transfer and Readfield's approaches. All decay curves can be adequately fitted <em>via</em> bi-exponential functions, suggesting the movement of energy between Dy<small><sup>3+</sup></small> → Sm<small><sup>3+</sup></small> ions. Temperature-dependent PL measurements and CIE color coordinate analysis reveal excellent luminescent properties, making these Dy<small><sup>3+</sup></small>/Sm<small><sup>3+</sup></small> co-doped phosphors advantageous for white light-emitting diode (WLED) technologies.</p>","PeriodicalId":71,"journal":{"name":"Dalton Transactions","volume":null,"pages":null},"PeriodicalIF":3.5000,"publicationDate":"2024-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Structural, photoluminescence and energy transfer investigations of novel Dy3+ → Sm3+ co-doped NaCaPO4 phosphors for white-light-emitting diode applications†\",\"authors\":\"Mudasir Farooq, Haqnawaz Rafiq, Irfan Nazir, Seemin Rubab and Mir Hashim Rasool\",\"doi\":\"10.1039/D4DT01020E\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<p >In this study, Dy<small><sup>3+</sup></small>-doped and Dy<small><sup>3+</sup></small>/Sm<small><sup>3+</sup></small> co-doped NaCaPO<small><sub>4</sub></small> white-emitting polycrystalline phosphor samples were synthesized using a solid-state reaction method. The samples were characterized by powder X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), Field-emission scanning electron microscopy (FE-SEM), and Photoluminescence (PL) analysis. The phase purity characterization and crystal structural analysis were done using the Rietveld refinement-based FullProf Suite software. The Rietveld refinement result confirms single-phase formation for both Sm<small><sup>3+</sup></small> and Dy<small><sup>3+</sup></small>/Sm<small><sup>3+</sup></small> co-doped NaCaPO<small><sub>4</sub></small> samples with an orthorhombic structure and with a monotonic change in lattice parameters with doping. The PL studies of the Dy<small><sup>3+</sup></small>-doped samples revealed two emission bands. However, at 352 nm, the Dy<small><sup>3+</sup></small>/Sm<small><sup>3+</sup></small>-co-doped samples revealed distinctive emission bands for both ions. The emission peaks at 480 nm (blue) and 573 nm (yellow) are related to the <small><sup>4</sup></small>F<small><sub>9/2</sub></small> → <small><sup>6</sup></small>H<small><sub>15/2</sub></small> and <small><sup>4</sup></small>F<small><sub>9/2</sub></small> → <small><sup>6</sup></small>H<small><sub>13/2</sub></small> transitions of Dy<small><sup>3+</sup></small> ions; however, the emission peaks at 600 nm and 647 nm are attributed to the <small><sup>4</sup></small>G<small><sub>5/2</sub></small> → <small><sup>6</sup></small>H<small><sub>7/2</sub></small> and <small><sup>4</sup></small>G<small><sub>5/2</sub></small> → <small><sup>6</sup></small>H<small><sub>7/2</sub></small> transitions of Sm<small><sup>3+</sup></small> ions. The intensity of the Dy<small><sup>3+</sup></small> emissions decreased as the Sm<small><sup>3+</sup></small> levels increased but the emission intensity of the Sm<small><sup>3+</sup></small> ions increased. The co-doping of Sm<small><sup>3+</sup></small> ions in Dy<small><sup>3+</sup></small>-doped phosphors results in unique characteristics due to the energy transfer (ET) from Dy<small><sup>3+</sup></small> → Sm<small><sup>3+</sup></small> ions. The effectiveness of this ET from Dy<small><sup>3+</sup></small> → Sm<small><sup>3+</sup></small> ions is positively correlated with the dopant amounts of the Sm<small><sup>3+</sup></small> ions. The interaction mechanisms have been identified as dipole–dipole based on Dexter's energy transfer and Readfield's approaches. All decay curves can be adequately fitted <em>via</em> bi-exponential functions, suggesting the movement of energy between Dy<small><sup>3+</sup></small> → Sm<small><sup>3+</sup></small> ions. Temperature-dependent PL measurements and CIE color coordinate analysis reveal excellent luminescent properties, making these Dy<small><sup>3+</sup></small>/Sm<small><sup>3+</sup></small> co-doped phosphors advantageous for white light-emitting diode (WLED) technologies.</p>\",\"PeriodicalId\":71,\"journal\":{\"name\":\"Dalton Transactions\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":3.5000,\"publicationDate\":\"2024-07-09\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Dalton Transactions\",\"FirstCategoryId\":\"92\",\"ListUrlMain\":\"https://pubs.rsc.org/en/content/articlelanding/2024/dt/d4dt01020e\",\"RegionNum\":3,\"RegionCategory\":\"化学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q2\",\"JCRName\":\"CHEMISTRY, INORGANIC & NUCLEAR\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Dalton Transactions","FirstCategoryId":"92","ListUrlMain":"https://pubs.rsc.org/en/content/articlelanding/2024/dt/d4dt01020e","RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"CHEMISTRY, INORGANIC & NUCLEAR","Score":null,"Total":0}
Structural, photoluminescence and energy transfer investigations of novel Dy3+ → Sm3+ co-doped NaCaPO4 phosphors for white-light-emitting diode applications†
In this study, Dy3+-doped and Dy3+/Sm3+ co-doped NaCaPO4 white-emitting polycrystalline phosphor samples were synthesized using a solid-state reaction method. The samples were characterized by powder X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), Field-emission scanning electron microscopy (FE-SEM), and Photoluminescence (PL) analysis. The phase purity characterization and crystal structural analysis were done using the Rietveld refinement-based FullProf Suite software. The Rietveld refinement result confirms single-phase formation for both Sm3+ and Dy3+/Sm3+ co-doped NaCaPO4 samples with an orthorhombic structure and with a monotonic change in lattice parameters with doping. The PL studies of the Dy3+-doped samples revealed two emission bands. However, at 352 nm, the Dy3+/Sm3+-co-doped samples revealed distinctive emission bands for both ions. The emission peaks at 480 nm (blue) and 573 nm (yellow) are related to the 4F9/2 → 6H15/2 and 4F9/2 → 6H13/2 transitions of Dy3+ ions; however, the emission peaks at 600 nm and 647 nm are attributed to the 4G5/2 → 6H7/2 and 4G5/2 → 6H7/2 transitions of Sm3+ ions. The intensity of the Dy3+ emissions decreased as the Sm3+ levels increased but the emission intensity of the Sm3+ ions increased. The co-doping of Sm3+ ions in Dy3+-doped phosphors results in unique characteristics due to the energy transfer (ET) from Dy3+ → Sm3+ ions. The effectiveness of this ET from Dy3+ → Sm3+ ions is positively correlated with the dopant amounts of the Sm3+ ions. The interaction mechanisms have been identified as dipole–dipole based on Dexter's energy transfer and Readfield's approaches. All decay curves can be adequately fitted via bi-exponential functions, suggesting the movement of energy between Dy3+ → Sm3+ ions. Temperature-dependent PL measurements and CIE color coordinate analysis reveal excellent luminescent properties, making these Dy3+/Sm3+ co-doped phosphors advantageous for white light-emitting diode (WLED) technologies.
期刊介绍:
Dalton Transactions is a journal for all areas of inorganic chemistry, which encompasses the organometallic, bioinorganic and materials chemistry of the elements, with applications including synthesis, catalysis, energy conversion/storage, electrical devices and medicine. Dalton Transactions welcomes high-quality, original submissions in all of these areas and more, where the advancement of knowledge in inorganic chemistry is significant.