Abstract
The upconversion (UC) luminescence in sol–gel synthesized Li +, Zn 2+, or Li +–Zn 2+ codoped Y 2O 3:Er 3+ nanocrystals were investigated under the excitation of a 970 nm diode laser. Compared to undoped Y 2O 3:Er 3+ samples, proper doping of Li +–Zn 2+ 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 4 I 11/2 (Er). The intensity ratio of the green over red emissions (green/red) is also affected by the codoping of Zn 2+, Li + and Li +–Zn 2+ ions. Our results demonstrated that the Li +–Zn 2+ codoping in Y 2O 3:Er 3+ phosphors produced remarkable enhancement of the UC luminescence and green/red ratio, making this nanocrystal a promising candidate for photonic and biological applications.
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