Abstract
Under laser excitation of 976nm, the green and red UC emissions of CaTiO3: Er3+ nanocrystals were consistent with 2H11/2, 4S3/2→4I15/2 and 4F9/2→4I15/2 transition of Er3+, respectively. The green and red UC luminescence of CaTiO3: Er3+/Yb3+ nanocrystals were significantly stronger than the counterpart of CaTiO3: Er3+ nanocrystals, which was resulted from energy transfer between Yb3+ and Er3+. The blue and red UC emissions of CaTiO3: Tm3+/Yb3+ nanocrystals near 480 and 650nm were observed due to the 1G4→3H6 and 1G4→3F4 transition of Tm3+, respectively. The overall and relative UC luminescence intensities of Er3+/Tm3+/Yb3+ tridoped CaTiO3 nanocrystals were found to be depended highly on the concentration of Yb3+ and Tm3+, for which the involved mechanisms were demonstrated. By adjusting the concentration of Yb3+ and Tm3+, CaTiO3: Er3+/Tm3+/Yb3+ nanocrystals with the CIE coordinates close to (0.33, 0.33) were obtained.
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