Photon-Avalanche Effect of Y₂O₃:Er,Yb Nanoparticles Prepared by Laser Ablation in Liquid

• Onodera Yuji

  Tokyo Institute of Technology

• Nunokawa Takashi

  Tokyo Institute of Technology

• Odawara Osamu

  Tokyo Institute of Technology

• Wada Hiroyuki

  Tokyo Institute of Technology

Abstract

Optical properties of upconversion nanoparticles Y₂O₃:Er,Yb were investigated. The upconversion nanoparticles were prepared by laser ablation in liquid, which was one of the promising plasma processes to fabricate nanoparticle-dispersed solution. Highly crystalline nanoparticles with particle size of 11±3 nm were observed by electron microscope. Upconversion spectra with an excitation of 980 nm were measured by fluorescence spectrophotometer. Photon-avalanche effect of the nanoparticles, which significantly increased upconversion intensity, was observed. This phenomenon would be due to the increase in population at red emission by cross-relaxation. The ratio of red emission to green one was increased by the increase in the concentration of Yb in phosphor and the decrease in the excitation power.

Journal

• Transactions of the Materials Research Society of Japan

  Transactions of the Materials Research Society of Japan 38 (2), 317-320, 2013

  The Materials Research Society of Japan

Keywords

• plasma plume
• laser ablation
• optical property
• upconversion, nanomaterial

Details

• CRID: 1390001205512569472
• NII Article ID: 130005004239
• DOI: 10.14723/tmrsj.38.317
• COI: 1:CAS:528:DC%2BC3sXht1arsbrF
• ISSN: 21881650
• ISSN: 13823469
• Web Site: https://www.jstage.jst.go.jp/article/tmrsj/38/2/38_317/_pdf
• Text Lang: en
• Data Source:
  • JaLC
  • Crossref
  • CiNii Articles
• Abstract License Flag: Disallowed