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[ÇóÖú] NaYF4ºÏ³É

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Materials. GdCl3³^H2O, (99.99%), YCl36H2O (99.99%), YbCl36H2O (99.99%), ErCl36H2O (99.9%),
NaOH (98+%), NH4F (98+%), 1©\octadecene (90%), and oleic acid (90%) were all purchased from
Sigma©\Aldrich and used as starting materials without further purification.

Synthesis of the nanorods. In a typical procedure to the synthesis of lanthanide©\doped NaYF4
nanorods, a DI water solution (1.5 ml) of 0.3 g NaOH was mixed with 5 ml of ethanol and 5 ml of
oleic acid under stirring. To the resulting mixture were selectively added 2 ml of RECl3 (0.2 M, RE
= Y, Yb, Er, Gd, Sm, Nd and La) and 1 ml of NH4F (2 M). Then the solution was transferred into a
20 ml of Teflon©\lined autoclave and heated at 200 oC for 2 h. The obtained nanorods were
collected by centrifugation, washed with water and ethanol several times, and finally re©\dispersed
in cyclohexane
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