Intense infrared, visible up and down emissions in Er3+/Yb3+ co-doped SrAl12O19 obtained by urea assisted combustion route
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SrAl12O19 phosphors containing the Yb3+ and the Er3+ were prepared using the urea-assisted combustion process. The formation of the combustion products was confirmed by the XRD analysis, indicating the formation of the hexagonal phase. The Er3+ emission at 1.5 µm and the IR-to-visible up-conversion emission upon the 980-nm excitation were evaluated as a function of the excitation power. The stronger green-emission band (4S3/2 → 4I15/2) at 546 nm became evident. The intensity of the visible, up, and down emission bands were significantly enhanced in the Er3+/Yb3+:SrAl12O19 phosphor due to the energy transfer from the Yb3+ ions to the Er3+ ions. The results indicate the potential of Er3+ and Er3+/Yb3+:SrAl12O19 phosphors for applications in optoelectronic devices.
This research was supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education (2017R1D1A1B03030003).
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