Tunable upconversion emission in Ba{sub 2}YF{sub 7}:Yb{sup 3+}/Er{sup 3+} nanocrystals with different Yb{sup 3+} concentration
- State Key Laboratory on Integrated Optoelectronics, College of Electronic Science and Engineering, College of Physics, Jilin University, Changchun 130012 (China)
- School of Basic Science, Changchun University of Technology, Changchun 130012 (China)
Graphical abstract: The emission intensity at 520 nm and 540 nm can be tuned by Yb{sup 3+} concentration. - Highlights: • High concentration of Yb{sup 3+} can be doped into Ba{sub 2}YF{sub 7} without a phase change. • The emission intensity at 520 nm and 540 nm can be tuned by Yb{sup 3+} concentration. • The long lifetime of {sup 4}F{sub 9/2} level makes its populating effective. - Abstract: Ba{sub 2}YF{sub 7}:xYb{sup 3+},0.02Er{sup 3+} nanocrystals with different Yb{sup 3+} 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 Yb{sup 3+} 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 Yb{sup 3+} concentration. To investigate the effect of Yb{sup 3+} ion, the decay times of 650 nm emission were measured and analyzed. Ba{sub 2}YF{sub 7}:0.6Yb{sup 3+},0.02Er{sup 3+} nanocrystals have the longest lifetime and highest emission intensity among all the samples. We concluded the lifetime of {sup 4}F{sub 9/2} level has an effect on its own population and intensity ratio of red and green emission. Our results show Yb{sup 3+} ion can tune the upconversion emission and improve upconverison emission intensity.
- OSTI ID:
- 22341704
- Journal Information:
- Materials Research Bulletin, Vol. 48, Issue 6; Other Information: Copyright (c) 2013 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); ISSN 0025-5408
- Country of Publication:
- United States
- Language:
- English
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