Enhancement of upconversion luminescence of Y2O 3:Er3+ nanocrystals by codoping Li+-Zn 2+

Huijuan Liang, Yangdong Zheng, Guanying Chen, Li Wu, Zhiguo Zhang, Wenwu Cao

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The upconversion (UC) luminescence in sol-gel synthesized Li+, Zn2+, or Li+-Zn2+ codoped Y2O 3:Er3+ nanocrystals were investigated under the excitation of a 970 nm diode laser. Compared to undoped Y2O3:Er 3+ samples, proper doping of Li+-Zn2+ leads to an drastic increase of the UC luminescence centered at 560 nm by a factor of 28. The UC luminescence enhancement is a result of the increased lifetime of the intermediate state 4I11/2 (Er). The intensity ratio of the green over red emissions (green/red) is also affected by the codoping of Zn2+, Li+ and Li+-Zn2+ ions. Our results demonstrated that the Li+-Zn2+ codoping in Y 2O3:Er3+ phosphors produced remarkable enhancement of the UC luminescence and green/red ratio, making this nanocrystal a promising candidate for photonic and biological applications.

Original languageEnglish (US)
Pages (from-to)409-413
Number of pages5
JournalJournal of Alloys and Compounds
Issue number2
StatePublished - Jan 12 2011

All Science Journal Classification (ASJC) codes

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry


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