Highly Stable White Light Emission from III-Nitride Nanowire LEDs Utilizing Nanostructured Alumina-Doped Mn4+ and Mg2+
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Le résumé fourni par la source
High Resolution Image Download MS PowerPoint Slide In this report, red-emitting alumina nanophosphors doped with Mn 4+ and Mg 2+ (Al 2 O 3:Mn 4+, Mg 2+ ) are synthesized by a hydrothermal method using a Pluronic surfactant. The prepared samples are ceramic-sintered at various temperatures. X-ray diffraction shows that Al 2 O 3:Mn 4+, Mg 2+ annealed at 500 °C exhibits a cubic γ-Al 2 O 3 phase with the space group Fd 3 m -227. The tetragonal δ-Al 2 O 3 and rhombohedral α-Al 2 O 3 phase is obtained at 1000 and 1300 °C, respectively. Cube-like nanoparticles in a size of ∼40 nm are observed for the alumina heated at 500–1000 °C. The size and red-emitting intensity of the phosphors remarkably increased with annealed temperature ∼1300 °C. Emission spectra of the phosphors show strong peaks at 678 and 692 nm due to 2 E g → 4 A 2 transitions of the Mn 4+ ion, under a light excitation of 460 nm. A strong zero-phonon line (ZPL) emission is observed in the luminescence spectra of δ-Al 2 O 3:Mn 4+, Mg 2+ at 298 K, whereas a weak one is observed in those of α- and γ-Al 2 O 3:Mn 4+, Mg 2+ . The alumina phosphors exhibited an excellent waterproof ability during 60 days in water and good thermal stability in the range of 77–573 K. A warm-white light-emitting diode (WLED) fabricated using In x Ga 1– x N nanowire chips with Al 2 O 3:Mn 4+, Mg 2+ red-emitting nanophosphors presents a high color rendering index of ∼95.1 and a low correlated color temperature of ∼4998 K. Moreover, the current–voltage characteristic of the nanowire LEDs could be improved using Al 2 O 3:Mn 4+, Mg 2+ nanophosphors which is attributed to the increased heat dissipation in the nanowire LEDs.
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Le contrôle bibliographique ouvert
DOI retrouvé dans Crossref DOI retrouvé, mais le titre doit être comparé manuellement.
- Titre Crossref
- Highly Stable White Light Emission from III-Nitride Nanowire LEDs Utilizing Nanostructured Alumina-Doped Mn<sup>4+</sup> and Mg<sup>2+</sup>
- Date Crossref
- 06/01/2023
- Éditeur
- American Chemical Society (ACS)
- Type
- journal-article
Ce recoupement confirme des métadonnées liées au DOI. Il ne confirme ni la méthode ni les conclusions de l’étude, et il ne compte pas comme une seconde source scientifique indépendante.
Où se fait cette recherche
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Vietnam Academy of Science and Technology pays non établi dans la noticeOrganisme public
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New Jersey Institute of Technology Helen and John C. Hartmann Department of Electrical and Computer Engineering pays non établi dans la noticeUniversité ou école supérieure
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Włodzimierz Trzebiatowski Institute of Low Temperature and Structure Research pays non établi dans la noticeStructure de recherche
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Polish Academy of Sciences Optical Spectroscopy Department pays non établi dans la noticeOrganisme public
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Institute of Chemical Technology pays non établi dans la noticeStructure de recherche
Vietnam Academy of Science and Technology, Helen and John C. Hartmann Department of Electrical and Computer Engineering — New Jersey Institute of Technology et Włodzimierz Trzebiatowski Institute of Low Temperature and Structure Research, avec 2 autres affiliations.
Une affiliation ne permet pas de déduire la nationalité d’un auteur.