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Lu2Ti2O7:Yb3+/Er3+ (LTO:Yb3+/Er3+) nanophosphors codoped with Yb3+ (8–20 at%) and Er3+ ions (0.5–4 at%) were synthesized by a microwave hydrothermal process. Under the 980 nm excitation, the sample gives a set of upconversion light: very strong red emissions near 661 nm (4F9/2 → 4I15/2), weak green around 523 nm and 545 nm (2H11/2 → 4I15/2 and 4S3/2 → 4I15/2, respectively). The optimum doping concentrations...
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