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. 

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