Analysis of structural defects and their influence on red‐emitting γ‐Al2O3:Mn4+,Mg2+ nanowires using positron annihilation spectroscopy.
| Title: | Analysis of structural defects and their influence on red‐emitting γ‐Al |
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| Authors: | Hue, Pham Thi, Hue, Nguyen Thi Ngoc, Van Tiep, Nguyen, Trung, Nguyen Vu Minh, Phuc, Phan Trong, Nguyen, La Ly, Son, Lo Thai, Trang, Le Thi Quynh, Trung, Ngo Dang, Hung, Nguyen Quang, Tuyen, Luu Anh, Duy, Nguyen Hoang |
| Source: | Luminescence: Journal of Biological & Chemical Luminescence; Sep2024, Vol. 39 Issue 9, p1-9, 9p |
| Abstract: | The present paper reported on the analysis of structural defects and their influence on the red‐emitting γ‐Al2O3:Mn4+,Mg2+ nanowires using positron annihilation spectroscopy (PAS). The nanowires were synthesized by hydrothermal method and low‐temperature post‐treatment using glucose as a reducing agent. X‐ray diffraction (XRD), scanning electron microscopy (SEM), photoluminescence (PL), and photoluminescence excitation (PLE) were utilized, respectively, for determining the structural phase, morphology and red‐emitting intensity in studied samples. Three PAS experiments, namely, positron annihilation lifetime (PAL), Doppler broadening (DB), and electron momentum distribution (EMD), were simultaneously performed to investigate the formations of structural defects in synthesized materials. Obtained results indicated that the doping concentration of 0.06% was optimal for the substitution of Mn4+ and Mg2+ to two Al3+ sites and the formation of oxygen vacancy (VO)‐rich vacancy clusters (2VAl + 3VO) and large voids (~0.7 nm) with less Al atoms. Those characteristics reduced the energy transfer between Mn4+ ions, thus consequently enhanced the PL and PLE intensities. Moreover, this optimal doping concentration also effectively controlled the size of nanopores (~2.18 nm); hence, it is expected to maintain the high thermal conductivity of γ‐Al2O3 nanowire‐phosphor. The present study, therefore, demonstrated a potential application of γ‐Al2O3 nanowire‐phosphor in fabricating the high‐performance optoelectronic devices. [ABSTRACT FROM AUTHOR] |
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| Database: | Complementary Index |
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| Items | – Name: Title Label: Title Group: Ti Data: Analysis of structural defects and their influence on red‐emitting γ‐Al<subscript>2</subscript>O<subscript>3</subscript>:Mn<superscript>4+</superscript>,Mg<superscript>2+</superscript> nanowires using positron annihilation spectroscopy. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Hue%2C+Pham+Thi%22">Hue, Pham Thi</searchLink><br /><searchLink fieldCode="AR" term="%22Hue%2C+Nguyen+Thi+Ngoc%22">Hue, Nguyen Thi Ngoc</searchLink><br /><searchLink fieldCode="AR" term="%22Van+Tiep%2C+Nguyen%22">Van Tiep, Nguyen</searchLink><br /><searchLink fieldCode="AR" term="%22Trung%2C+Nguyen+Vu+Minh%22">Trung, Nguyen Vu Minh</searchLink><br /><searchLink fieldCode="AR" term="%22Phuc%2C+Phan+Trong%22">Phuc, Phan Trong</searchLink><br /><searchLink fieldCode="AR" term="%22Nguyen%2C+La+Ly%22">Nguyen, La Ly</searchLink><br /><searchLink fieldCode="AR" term="%22Son%2C+Lo+Thai%22">Son, Lo Thai</searchLink><br /><searchLink fieldCode="AR" term="%22Trang%2C+Le+Thi+Quynh%22">Trang, Le Thi Quynh</searchLink><br /><searchLink fieldCode="AR" term="%22Trung%2C+Ngo+Dang%22">Trung, Ngo Dang</searchLink><br /><searchLink fieldCode="AR" term="%22Hung%2C+Nguyen+Quang%22">Hung, Nguyen Quang</searchLink><br /><searchLink fieldCode="AR" term="%22Tuyen%2C+Luu+Anh%22">Tuyen, Luu Anh</searchLink><br /><searchLink fieldCode="AR" term="%22Duy%2C+Nguyen+Hoang%22">Duy, Nguyen Hoang</searchLink> – Name: TitleSource Label: Source Group: Src Data: Luminescence: Journal of Biological & Chemical Luminescence; Sep2024, Vol. 39 Issue 9, p1-9, 9p – Name: Abstract Label: Abstract Group: Ab Data: The present paper reported on the analysis of structural defects and their influence on the red‐emitting γ‐Al2O3:Mn4+,Mg2+ nanowires using positron annihilation spectroscopy (PAS). The nanowires were synthesized by hydrothermal method and low‐temperature post‐treatment using glucose as a reducing agent. X‐ray diffraction (XRD), scanning electron microscopy (SEM), photoluminescence (PL), and photoluminescence excitation (PLE) were utilized, respectively, for determining the structural phase, morphology and red‐emitting intensity in studied samples. Three PAS experiments, namely, positron annihilation lifetime (PAL), Doppler broadening (DB), and electron momentum distribution (EMD), were simultaneously performed to investigate the formations of structural defects in synthesized materials. Obtained results indicated that the doping concentration of 0.06% was optimal for the substitution of Mn4+ and Mg2+ to two Al3+ sites and the formation of oxygen vacancy (VO)‐rich vacancy clusters (2VAl + 3VO) and large voids (~0.7 nm) with less Al atoms. Those characteristics reduced the energy transfer between Mn4+ ions, thus consequently enhanced the PL and PLE intensities. Moreover, this optimal doping concentration also effectively controlled the size of nanopores (~2.18 nm); hence, it is expected to maintain the high thermal conductivity of γ‐Al2O3 nanowire‐phosphor. The present study, therefore, demonstrated a potential application of γ‐Al2O3 nanowire‐phosphor in fabricating the high‐performance optoelectronic devices. [ABSTRACT FROM AUTHOR] – Name: Abstract Label: Group: Ab Data: <i>Copyright of Luminescence: Journal of Biological & Chemical Luminescence is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1002/bio.4881 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 9 StartPage: 1 Titles: – TitleFull: Analysis of structural defects and their influence on red‐emitting γ‐Al2O3:Mn4+,Mg2+ nanowires using positron annihilation spectroscopy. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Hue, Pham Thi – PersonEntity: Name: NameFull: Hue, Nguyen Thi Ngoc – PersonEntity: Name: NameFull: Van Tiep, Nguyen – PersonEntity: Name: NameFull: Trung, Nguyen Vu Minh – PersonEntity: Name: NameFull: Phuc, Phan Trong – PersonEntity: Name: NameFull: Nguyen, La Ly – PersonEntity: Name: NameFull: Son, Lo Thai – PersonEntity: Name: NameFull: Trang, Le Thi Quynh – PersonEntity: Name: NameFull: Trung, Ngo Dang – PersonEntity: Name: NameFull: Hung, Nguyen Quang – PersonEntity: Name: NameFull: Tuyen, Luu Anh – PersonEntity: Name: NameFull: Duy, Nguyen Hoang IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 09 Text: Sep2024 Type: published Y: 2024 Identifiers: – Type: issn-print Value: 15227235 Numbering: – Type: volume Value: 39 – Type: issue Value: 9 Titles: – TitleFull: Luminescence: Journal of Biological & Chemical Luminescence Type: main |
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