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Fig. 6 | Nanoscale Research Letters

Fig. 6

From: (La0.97RE0.01Yb0.02)2O2S Nanophosphors Converted from Layered Hydroxyl Sulfate and Investigation of Upconversion Photoluminescence (RE=Ho, Er)

Fig. 6

Upconversion luminescence spectra (a) and the relationship between log(I em) and log(P) (b) for the (La0.97Er0.01Yb0.02)2O2S phosphor, where I em and P are the emission intensity and excitation power (in watt), respectively. The inset in a is a photograph showing the strong UC emission of (La0.97Er0.01Yb0.02)2O2S under 50 mW of 978-nm laser excitation

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