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Ag2Te quantum dots (QDs) were synthesized through ion-exchange method with CdTe QDs as precursors. The same size of Ag2Te QDs can be obtained from the different sizes of precursors, which results in the similar fluorescent behaviors. The maximum FL peak of Ag2Te QDs is red-shifted from 510nm to 950nm with the increase of ion-exchange time. Strong cathodic ECL of Ag2Te QDs can be observed in neutral...