The preparation of ZnGa2O4 doped with Mn‐Mg and Tm for green and blue phosphors

Abstract Phosphor powders of zinc gallate (ZnGa 2 O 4 ) with Mg and Mn for green and Tm‐Mg for blue luminescence were prepared by solid state reaction method for their improved luminescent properties. Green‐luminescence emitting ZnMnGa 2 O 4 reached maximum intensity at Mn = 0.005 mol% and further improvement was achieved by the addition of Mg 2+ . Tm‐Mg based zinc gallate phosphor exhibited a strong blue emission, centered at ∼420 nm with the maximum intensity achieved for 0.003 mol% of Mg and 0.015 mol% of Tm. This study established the possibilities of controlling the luminescent characteristics of zinc gallate by adding various elements. © 2006 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc.