Abstract
The Ca2+-doped LaVO4:Eu3+ nanocrystals were synthesized via a simple solvothermal route. The phase, morphology, as well as optical property were studied detailedly. The experimental results demonstrated that Ca2+ ions restricted the further growth of LaVO4:Eu3+ nanocrystals and raised the photoluminescence (PL) intensity concurrently. The formation mechanism and fluorescent property variation were systematically investigated. Because of the charge mismatch, the Cu2+ ions were attracted onto the grain surface by negative poles generated in the doping process. Then energy transfer (ET) occurred from Eu3+ to Cu2+, which caused the fluorescence quenching. Remarkably, the limit of detection for Cu2+ ions was as low as 0.492 μM. Hence, it would be served as a sensitive fluorescent probe for Cu2+ ions detection.
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