Abstract
Pyrochlore Y2Sn2O7 nanophosphors codoped with Er3+ (fixed 2 at.%) and Yb3+ ions (2–16 at.%) were synthesized via hydrothermal process followed by heat treatment. We investigate the infrared-to-visible upconversion (UC) luminescence properties of Er–Yb codoped Y2Sn2O7. Upon 980 nm excitation at room temperature, green (at ~522 and 544 nm) and red (at ~661 nm) UC emissions were observed, which are ascribed to the (2H11/2, 4S3/2) → 4I15/2 and 4F9/2 → 4I15/2 transitions, respectively. It has been found that the Yb3+-doping concentrations have greatly influenced on the UC luminescence intensity and the emission ratio of the red and green in Y2Sn2O7:Yb3+/Er3+ nanophosphors. The tunable emission is due to the energy back transfer from Er3+ to Yb3+ and the cross relaxation between the two neighboring Er3+ ions. It is expected that the achieved single and intense red emission band may have potential application for in vivo bioimaging.
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