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

Figure 8

Infrared spectrum of (a): CsY₂F₇∶  78%  Y, 20%  Yb, 2.0%  Er generated in the microwave synthesis apparatus, (b): CsY₂F₇∶ 78%  Y, 20%  Yb, 2.0%  Er generated in HEEDA, (c): the solvent 𝑁-(2-hydroxyethyl)-ethylenediamine (HEEDA).