Figure 4.

UC spectra of NPs in UV-blue spectral region after excitation with 978-nm radiation. Y1.97Yb0.02Er0.01O3 (green line), Y1.94Yb0.05Er0.01O3 (blue line), and Y1.89Yb0.10Er0.01O3 (red line).

Lojpur et al. Nanoscale Research Letters 2013 8:131   doi:10.1186/1556-276X-8-131
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