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Figure 4 | Nanoscale Research Letters

Figure 4

From: Upconversion in solar cells

Figure 4

Upconverted emission and absorption spectra of the upconverter in PMMA layer. The emission spectrum is obtained when the upconverter shows no saturation and only emission peaks from the 4S3/2, 2H11/2 (510 to 560 nm), and 4F9/2 (650 to 680 nm) states are observed.

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