Tunable upconversion emission in Ba2YF7:Yb 3+/Er3+ nanocrystals with different Yb3+ concentration

Xiaohong Chuai, Feixiang Yin, Zhenyu Liu, Feng Shi, Jianshuo Wang, Lili Wang, Kezhi Zheng, Chunfeng He, Weiping Qin

Research output: Contribution to journalArticlepeer-review

8 Scopus citations

Abstract

Ba2YF7:xYb3+,0.02Er3+ nanocrystals with different Yb3+ concentration (x = 0.2, 0.4, 0.6, 0.8, 0.98) were synthesized via a solvothermal method. Their X-ray diffraction patterns reveal that all the samples are cubic phase without phase change at arbitrary Yb3+ concentration. Upon excitation of 980 nm laser, these nanocrystals display upconversion emission in the green and red spectral regions. The relative emission intensity at these two regions can be tuned by Yb3+ concentration. To investigate the effect of Yb3+ ion, the decay times of 650 nm emission were measured and analyzed. Ba 2YF7:0.6Yb3+,0.02Er3+ nanocrystals have the longest lifetime and highest emission intensity among all the samples. We concluded the lifetime of 4F9/2 level has an effect on its own population and intensity ratio of red and green emission. Our results show Yb3+ ion can tune the upconversion emission and improve upconverison emission intensity.

Original languageEnglish
Pages (from-to)2361-2364
Number of pages4
JournalMaterials Research Bulletin
Volume48
Issue number6
DOIs
StatePublished - Jun 2013
Externally publishedYes

Keywords

  • A. Fluorides
  • A. Optical materials
  • B. Chemical synthesis
  • D. Luminescence
  • D. Optical properties

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