Abstract
Y1.9Er0.1O3 and Y1.7Yb0.2Er0.1O3 nanocrystalline powders were prepared via a reverse‐strike coprecipitation method using nitrates and ammonia as raw materials. The obtained powders were of cubic‐phase structure of Y2O3 and the particle size was in the range of ∼60–80 nm. Strong red (4F9/2–4I15/2) and green (2H11/2/4S3/2–4I15/2) upconversion luminescence were observed in all the samples when excited with a 980‐nm continuous wave diode laser. The possible upconversion mechanisms in Y1.9Er0.1O3 and Y1.7Yb0.2Er0.1O3 were discussed. Power studies indicated that two‐photon processes are responsible for the green and red upconversion luminescence in these systems. The codoping of Yb3+ greatly enhanced the red (4F9/2–4I15/2) upconversion emission.
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