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A series of Er3+,Tm3+ and Yb3+ doped Gd3Ga5O12 nanocrystals were prepared by a combustion method.The X-ray diffraction(XRD),field emission scanning electron microscope(FESEM)and upconversion(UC)emission spectra were used to characterize the samples.The results of XRD indicate that Gd3Ga5O12:Er3+,Tm3+,Yb3+ nanocrystals with cubic phase can be obtained.Under the excitation of a 980 nm laser,the different rare earth ions doped Gd3Ga5O12 nanocrystals show upconversion luminescence involving the green emission attributed to the 2H11/2→4I15/2,4S3/2→4I15/2 transitions of Er3+ ions,respectively,the red emissions assigned to the 4F9/2→4I15/2 transitions of Er3+ ions and the 1G4→3F4 as well as 3F2,3→3H6 transitions of Tm3+ ions,respectively,the blue emission attributed to 1G4→3H6 transitions of Tm3+ions,and the near-infrared assigned to the 3H4→3H6 transitions of Tm3+ ions.The CIE coordinates for the samples are calculated.The dependence of their upconversion luminescence properties on Yb3+ ion concentration is investigated.
A series of Er3 +, Tm3 + and Yb3 + doped Gd3Ga5O12 nanocrystals were prepared by a combustion method. X-ray diffraction (XRD), field emission scanning electron microscope (FESEM) and upconversion results of XRD indicate that Gd3Ga5O12: Er3 +, Tm3 +, Yb3 + nanocrystals with cubic phase can be obtained. Under the excitation of a 980 nm laser, the different rare earth ions doped Gd3Ga5O12 nanocrystals show upconversion luminescence involving the green emission attributed to 2H11 / 2 → 4I15 / 2,4S3 / 2 → 4I15 / 2 transitions of Er3 + ions, respectively, the red emissions assigned to the 4F9 / 2 → 4I15 / 2 transitions of Er3 + ions and the 1G4 → 3F4 as well as 3F2,3 → 3H6 transitions of Tm3 + ions, respectively, the blue emission attributed to 1G4 → 3H6 transitions of Tm3 + ions, and the near-infrared assigned to the 3H4 → 3H6 transitions of Tm3 + ions. The CIE coordinates for the samples were calculated. The dependence of their upconversion luminescence propertie s on Yb3 + ion concentration is investigated.