Controllable Multicolor Upconversion Luminescence of Lanthanide Doped NaGdF4 Nanocrystals Through Single Laser Excitation at 980 nm
Abstract:Room temperature multicolor Upconversion (UC) luminescence in Yb3+, Tm3+, Er3+ ions doped NaGdF4 nanocrystals have been successfully synthesized by a hydrothermal method. As-prepared nanocrystals are highly crystalline and well-dispersed in cyclohexane to form stable and clear colloidal solutions, which demonstrates strong emission properties with a single laser excitation at 980 nm. The multicolor light consists of blue, green, and red UC radiations that correspond to transitions 1G4 → 3H6 of Tm3+, 2H11/2/4S3/2 → 4I15/2, and 4F9/2 → 4I15/2 of Er3+ ions, respectively. The UC mechanisms were proposed based on spectral, kinetic, and pump power dependence analyses.
Document Type: Research Article
Publication date: November 1, 2011
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