Synthesis and Characterization of Upconversion Fluorescent Yb^𝟑+, Er^𝟑+ Doped CsY_𝟐F_𝟕 Nano- and Microcrystals

Figure 5

Emission spectrum of a 1 wt.% colloidal solution of CsY₂F₇: 78%  Y, 20%  Yb, 2.0%  Er nanocrystals in methanol.