Articles
  • Enhancement of the luminescence efficiency of Li2TiO3:Mn4+ red emitting phosphor for white LEDs 
  • K. Sekia, S. Kameia, K. Uematsuc, T. Ishigakib, K. Todaa,b and M. Satob,c
  • a Graduate School of Science and Technology, Niigata University, 8050 Ikarashi 2-nocho, Niigata, 950-2181, Japan b Center for Transdisciplinary Research, Niigata University, 8050 Ikarashi 2-nocho, Niigata, 950-2181, Japan c Department of Chemistry and Chemical Engineering, Niigata University, 8050 Ikarashi 2-nocho, Niigata, 950-2181, Japan
Abstract
A red-emitting Li2TiO3:Mn4+ phosphor has excellent luminescence property. To enhance the optical absorption in the blue light region and to apply the phosphor to tri-color LEDs, we tried that a part of the Li+ and Ti4+ sites in the Li2TiO3:Mn4+ phosphor was substituted with alkaline metal ions (A = Na, K and Rb) and Ge4+ ions, respectively. The resulting phosphor exhibited efficient red emission and the luminescence intensity was about 3 times higher than that of Li-2(Ti0.99Mn0.01)O-3. The relative emission intensity of the phosphor was approximately 70%, compared with that of YAG:Ce3+ (P46) when the phosphors were excited at 460 nm. These results indicate that the red-emitting (Li0.97Rb0.03)(2)(Ti0.70Ge0.30)O-3:Mn4+ phosphor is a promising candidate for white LEDs.

Keywords: Li2TiO3; Mn4+; White LED; Substitution

This Article

  • 2013; 14(S1): 67-70

    Published on Mar 31, 2013

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