Research Article
Efficient Color Tuning of Upconversion Luminescence from Core-Shell Oxysulfide Nanoparticles
Figure 1
XRD spectra of (a) Y2O2S: Er3+, (b) Y2O2S: Er3+@Y2O2S: Yb3+, Ho3+ nanocrystals and (c) standard card of hexagonal Y2O2S (JCPDS: No.24-1424).