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A facile two-step route is used to synthesize core–shell structured NaYF4: Yb, Er/g-C3N4 nanocomposites (NaYF4/CN). A hot cyanuric acid solution and a melamine solution are put into a NaYF4: Yb, Er colloid to form ternary NaYF4: Yb, Er-cyanuric acid-melamine (NaYF4/CM) adducts. And then, the prismatic NaYF4/CM composites are annealed at 550°C, which results in a structure change from NaYF4/CM to NaYF...
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