中国物理B ›› 2017, Vol. 26 ›› Issue (3): 36101-036101.doi: 10.1088/1674-1056/26/3/036101

• CONDENSED MATTER: STRUCTURAL, MECHANICAL, AND THERMAL PROPERTIES • 上一篇    下一篇

Intrinsic luminescence centers in γ- and θ-alumina nanoparticles

Abdolvahab Amirsalari, Saber Farjami Shayesteh, Reza Taheri Ghahrizjani   

  1. 1 Nanostructures Labratory, Department of Physics, University of Guilan, Rasht, Iran;
    2 Department of Physics, Optics and Laser Group, Shahreza Branch, Islamic Azad University, Isfahan, Iran
  • 收稿日期:2016-06-25 修回日期:2016-11-15 出版日期:2017-03-05 发布日期:2017-03-05
  • 通讯作者: Saber Farjami Shayesteh, Reza Taheri Ghahrizjani E-mail:saber@guilan.ac.ir;Taheri.reza@iaush.ac.ir

Intrinsic luminescence centers in γ- and θ-alumina nanoparticles

Abdolvahab Amirsalari1, Saber Farjami Shayesteh1, Reza Taheri Ghahrizjani2   

  1. 1 Nanostructures Labratory, Department of Physics, University of Guilan, Rasht, Iran;
    2 Department of Physics, Optics and Laser Group, Shahreza Branch, Islamic Azad University, Isfahan, Iran
  • Received:2016-06-25 Revised:2016-11-15 Online:2017-03-05 Published:2017-03-05
  • Contact: Saber Farjami Shayesteh, Reza Taheri Ghahrizjani E-mail:saber@guilan.ac.ir;Taheri.reza@iaush.ac.ir

摘要: In this study, we investigate the photoluminescence (PL) properties of γ and θ-alumina nanoparticles synthesized by the chemical wet method followed by annealing. The obtained experimental results indicate the presence of some favorable near ultraviolet (NUV)-orange luminescent centers for usage in various luminescence applications, such as oxygen vacancies (F, F2+, F22+, and F2 centers), OH related defects, cation interstitial centers, and some new luminescence bands attributed to trapped-hole centers or donor-acceptor centers. The energy states of each defect are discussed in detail. The defects mentioned could alter the electronic structure by producing some energy states in the band gap that result in the optical absorption in the middle ultraviolet (MUV) region. Spectra show that photoionazation of F and F2 centers plays a crucial role in providing either free electrons for the conduction band, or the photoconversions of aggregated oxygen vacancies into each other, or mobile electrons for electrons-holes recombination process by the Shockley-Read-Hall (SRH) mechanism.

关键词: photoluminescence center, defect, oxygen vacancy, emission

Abstract: In this study, we investigate the photoluminescence (PL) properties of γ and θ-alumina nanoparticles synthesized by the chemical wet method followed by annealing. The obtained experimental results indicate the presence of some favorable near ultraviolet (NUV)-orange luminescent centers for usage in various luminescence applications, such as oxygen vacancies (F, F2+, F22+, and F2 centers), OH related defects, cation interstitial centers, and some new luminescence bands attributed to trapped-hole centers or donor-acceptor centers. The energy states of each defect are discussed in detail. The defects mentioned could alter the electronic structure by producing some energy states in the band gap that result in the optical absorption in the middle ultraviolet (MUV) region. Spectra show that photoionazation of F and F2 centers plays a crucial role in providing either free electrons for the conduction band, or the photoconversions of aggregated oxygen vacancies into each other, or mobile electrons for electrons-holes recombination process by the Shockley-Read-Hall (SRH) mechanism.

Key words: photoluminescence center, defect, oxygen vacancy, emission

中图分类号:  (Nanocrystals)

  • 61.46.Hk
78.55.Hx (Other solid inorganic materials) 78.67.Bf (Nanocrystals, nanoparticles, and nanoclusters) 81.07.Bc (Nanocrystalline materials)