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The LaF3: xmol% Eu3+(x¼1, 3, 5, 8, 10) nanoparticles were
prepared by using a modified literature procedure.3In a typical
experiment, 0.65 mmol of La2O3and stoichiometric Eu2O3were
dissolved in concentrated HNO3firstly by stirring at about 90C,
and then 2 ml of methanol was added to form a transparent RE
nitrate methanol solution. An aqueous solution of 10.4 mmol of
citric acid in 35 ml of deionized water was partially neutralized
with 1.5 ml of concentrated NH4OH to a pH of 5.5.
²Î¿¼ÎÄÏ×£ºEnhanced emission of ultra-small-sized LaF3:RE3+(RE=Eu, Tb)nanoparticles through 1,2,4,5-benzenetetracarboxylic acid sensitization
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