Figure 6.

TEMs of NaGdF4:Yb, Ho nanocrystals. (A) Five times standard concentration; (B) 25% standard concentration; (C) XRD pattern of NaGdF4:Yb, Ho nanocrystals; (D) Upconversion spectrum of NaGdF4:Yb, Ho nanocrystals under excitation of 980 nm.

Wang and Nann Nanoscale Research Letters 2011 6:267   doi:10.1186/1556-276X-6-267
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