we are trying to make some Eu2O3 nanoparticles for fluorescence test, however, after synthesis through varieties of ways, we can't get the desired emission at 614 nm.
attached is the fluorescence spectrum of commercial Eu2O3 which brought from sigma and the one we synthesis. For somehow, we lost the 614 nm fluorescence emission.
PS; Commercial Eu2O3 nanoparticle is too large for our project, it can only use as the reference.
Is the fluorescence spectrum of the nanoparticles dependent upon the size of the particles? Your particle size may be different from the commercial product. Have you measured the sizes?
I do know the optical property is size dependence, however, I read a lot of paper which is not nanoparticle related, you still could have this 614nm emission.
the 614nm (5D0 - 7F2 transition) emission is the feature of Eu3+, no matter it is a nanoparticle or bulk material or an ion in a solution. it may shift to 620nm area, it can not be disappeared.
Your nanoparticles are not pure Eu2O3, the reason is this. This band becomes weaker if the metal also has other bonds (with an OH group, with a solvent, for example). Do an elemental analysis.
Washing with a solvent will not help. Only calcination can remove organic ligands and hydroxyls. However, when heated, complexes with organic ligands can sublimate.
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