Effect of Eu3 + codoping on upconversion luminescence in Y2O3:Er3 +, Yb3 + nanocrystals

✍ Scribed by Y.Q. Sheng; J. Liu; L.L. Xu; D. Zhai; Z.G. Zhang; W.W. Cao

• Publisher: Elsevier Science
• Year: 2010
• Tongue: English
• Weight: 434 KB
• Volume: 150
• Category: Article
• ISSN: 0038-1098
• DOI: 10.1016/j.ssc.2010.03.004

✦ Synopsis

The influence of Eu 3+ on the upconversion (UC) fluorescence of Er 3+ in Y 2 O 3 :Er 3+ , Yb 3+ nanocrystals was investigated. Room-temperature UC spectra show that the intensity ratio of red to green lights was increased from 8.6 to 19.3 with 1.0 mol% Eu 3+ doping. Additionally, with the increase of Eu 3+ ion concentration, the n values for both green and red UC emissions in Y 2 O 3 :Er 3+ , Yb 3+ nanocrystals become larger. Our analysis shows that the energy transfer between Eu 3+ and Er 3+ ions is the main cause for the enhancement of 2 H 11/2 , 4 S 3/2 → 4 F 9/2 and 4 I 11/2 → 4 I 13/2 transitions of Er 3+ ions.