Figure 2.

PLE and PL spectra by monitoring Ho3+emission. (a) PLE spectra by monitoring Ho3+: 5S25I8 emission at 540 nm and (b) visible PL spectra under excitation of 450 nm (5I85 G6, 5 F1) of BaGdF5: 1% Ho3+, x% Yb3+ (0 ≤ x ≤ 20) nanoparticles.

Guo et al. Nanoscale Research Letters 2012 7:636   doi:10.1186/1556-276X-7-636
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