Preparation of ZnGa2O4 nanoflowers and their full-color luminescence properties

Abstract Gallate material, a luminescent matrix with excellent performance is normally prepared by vapor deposition or solid phase sintering method at high temperature. However, it has not been solved to prepare gallate-based fluorescent materials with full-color luminescent properties at low temperature. In this paper, ZnGa 2 O 4 undoped or doped with Cr or Mn nanoflowers composed of nanosheet-level structure were prepared by hydrothermal method at low temperature. Under ultraviolet light irradiation, ZnGa 2 O 4 , ZnGa 2 O 4 :Mn 2+ and ZnGa 2 O 4 :Cr 3+ display three primary colors of blue, green and red luminescence through self-excitation, Mn 2+ and Cr 3+ excitation respectively. The solid fluorescence yields of blue, green, and red colors are 32.3, 36.5, and 40.7%, respectively. It is highly expected to be applied to color display, biological imaging, white light devices.