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BaGd 2 ZnO 5 :Yb 3+ /Pr 3+ nanocrystals have been successfully synthesized by Pecchini sol–gel reaction. Under single-wavelength diode laser excitation of 971nm, the unique bright UC emissions of BaGd 2 ZnO 5 :Yb 3+ /Pr 3+ nanocrystals centered at 334nm, 520nm and 667nm were observed, which can be assigned to the transitions of 4f5d→...
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