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(Yb3+, Er3+) and (Yb3+, Tm3+)-codoped Lu2O3 nanorods: Hydrothermal synthesis and visible emissions

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(Yb3+, Er3+) and (Yb3+, Tm3+) codoped Lu2O3 nanorods have been prepared by a low temperature hydrothermal procedure. Their optical behavior, in terms of luminescence and waveguiding properties was analyzed. Room temperature upconversion (UC) under excitation at 980 nm and cathodoluminescence (CL) spectra were studied in function of the Yb3+ concentration. UC spectra revealed the strong development of Er3+ 4F9/24I15/2 (red) and Tm3+ 1G43H6 (blue) bands, which were favored by a high Yb3+ concentration. UC mechanisms privilege the population of 4F9/2 and 1G4 emitting levels through phonon assisted energy-transfer and non-radiative relaxations, which are helped by the large phonons existing in the current nanorods. CL spectra show a moderate increase of the intensity ratio between the Er3+ 4F9/24I15/2 (red) and 2H11/2, 4S3/24I15/2 (green) emissions with the increase in the Yb3+ content, while for Yb3+, Tm3+-codoped Lu2O3 nanorods the dominant CL emission is Tm3+ 1D23F4 (deep-blue). Uniform light emission along Yb3+, Er3+-codoped Lu2O3 rods has been observed by using SNOM photoluminescence images.

© 2011 Optical Society of America

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